Release 4.7 kernel/trace/trace.c

Directory: kernel/trace
/*
 * ring buffer based function tracer
 *
 * Copyright (C) 2007-2012 Steven Rostedt <srostedt@redhat.com>
 * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
 *
 * Originally taken from the RT patch by:
 *    Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Based on code from the latency_tracer, that is:
 *  Copyright (C) 2004-2006 Ingo Molnar
 *  Copyright (C) 2004 Nadia Yvette Chambers
 */
#include <linux/ring_buffer.h>
#include <generated/utsrelease.h>
#include <linux/stacktrace.h>
#include <linux/writeback.h>
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
#include <linux/notifier.h>
#include <linux/irqflags.h>
#include <linux/debugfs.h>
#include <linux/tracefs.h>
#include <linux/pagemap.h>
#include <linux/hardirq.h>
#include <linux/linkage.h>
#include <linux/uaccess.h>
#include <linux/kprobes.h>
#include <linux/ftrace.h>
#include <linux/module.h>
#include <linux/percpu.h>
#include <linux/splice.h>
#include <linux/kdebug.h>
#include <linux/string.h>
#include <linux/mount.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/nmi.h>
#include <linux/fs.h>
#include <linux/sched/rt.h>

#include "trace.h"
#include "trace_output.h"

/*
 * On boot up, the ring buffer is set to the minimum size, so that
 * we do not waste memory on systems that are not using tracing.
 */

bool ring_buffer_expanded;

/*
 * We need to change this state when a selftest is running.
 * A selftest will lurk into the ring-buffer to count the
 * entries inserted during the selftest although some concurrent
 * insertions into the ring-buffer such as trace_printk could occurred
 * at the same time, giving false positive or negative results.
 */

static bool __read_mostly tracing_selftest_running;

/*
 * If a tracer is running, we do not want to run SELFTEST.
 */

bool __read_mostly tracing_selftest_disabled;

/* Pipe tracepoints to printk */

struct trace_iterator *tracepoint_print_iter;

int tracepoint_printk;

/* For tracers that don't implement custom flags */

static struct tracer_opt dummy_tracer_opt[] = {
	{ }
};


static int

dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
	return 0;
}

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/*
 * To prevent the comm cache from being overwritten when no
 * tracing is active, only save the comm when a trace event
 * occurred.
 */
static DEFINE_PER_CPU(bool, trace_cmdline_save);

/*
 * Kill all tracing for good (never come back).
 * It is initialized to 1 but will turn to zero if the initialization
 * of the tracer is successful. But that is the only place that sets
 * this back to zero.
 */

static int tracing_disabled = 1;


cpumask_var_t __read_mostly	tracing_buffer_mask;

/*
 * ftrace_dump_on_oops - variable to dump ftrace buffer on oops
 *
 * If there is an oops (or kernel panic) and the ftrace_dump_on_oops
 * is set, then ftrace_dump is called. This will output the contents
 * of the ftrace buffers to the console.  This is very useful for
 * capturing traces that lead to crashes and outputing it to a
 * serial console.
 *
 * It is default off, but you can enable it with either specifying
 * "ftrace_dump_on_oops" in the kernel command line, or setting
 * /proc/sys/kernel/ftrace_dump_on_oops
 * Set 1 if you want to dump buffers of all CPUs
 * Set 2 if you want to dump the buffer of the CPU that triggered oops
 */


enum ftrace_dump_mode ftrace_dump_on_oops;

/* When set, tracing will stop when a WARN*() is hit */

int __disable_trace_on_warning;

#ifdef CONFIG_TRACE_ENUM_MAP_FILE
/* Map of enums to their values, for "enum_map" file */

struct trace_enum_map_head {
	
struct module			*mod;
	
unsigned long			length;
};

union trace_enum_map_item;


struct trace_enum_map_tail {
	/*
         * "end" is first and points to NULL as it must be different
         * than "mod" or "enum_string"
         */
	
union trace_enum_map_item	*next;
	
const char			*end;	/* points to NULL */
};

static DEFINE_MUTEX(trace_enum_mutex);

/*
 * The trace_enum_maps are saved in an array with two extra elements,
 * one at the beginning, and one at the end. The beginning item contains
 * the count of the saved maps (head.length), and the module they
 * belong to if not built in (head.mod). The ending item contains a
 * pointer to the next array of saved enum_map items.
 */

union trace_enum_map_item {
	
struct trace_enum_map		map;
	
struct trace_enum_map_head	head;
	
struct trace_enum_map_tail	tail;
};


static union trace_enum_map_item *trace_enum_maps;
#endif /* CONFIG_TRACE_ENUM_MAP_FILE */

static int tracing_set_tracer(struct trace_array *tr, const char *buf);


#define MAX_TRACER_SIZE		100

static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata;

static char *default_bootup_tracer;


static bool allocate_snapshot;



static int __init set_cmdline_ftrace(char *str)
{
	strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE);
	default_bootup_tracer = bootup_tracer_buf;
	/* We are using ftrace early, expand it */
	ring_buffer_expanded = true;
	return 1;
}
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li zefan li zefan 1 3.12% 1 14.29%
chen gang chen gang 1 3.12% 1 14.29%
Total 32 100.00% 7 100.00%

__setup("ftrace=", set_cmdline_ftrace);



static int __init set_ftrace_dump_on_oops(char *str)
{
	if (*str++ != '=' || !*str) {
		ftrace_dump_on_oops = DUMP_ALL;
		return 1;
	}

	if (!strcmp("orig_cpu", str)) {
		ftrace_dump_on_oops = DUMP_ORIG;
                return 1;
        }

        return 0;
}
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__setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops);



static int __init stop_trace_on_warning(char *str)
{
	if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0))
		__disable_trace_on_warning = 1;
	return 1;
}
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__setup("traceoff_on_warning", stop_trace_on_warning);



static int __init boot_alloc_snapshot(char *str)
{
	allocate_snapshot = true;
	/* We also need the main ring buffer expanded */
	ring_buffer_expanded = true;
	return 1;
}
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__setup("alloc_snapshot", boot_alloc_snapshot);



static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata;



static int __init set_trace_boot_options(char *str)
{
	strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE);
	return 0;
}
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__setup("trace_options=", set_trace_boot_options);


static char trace_boot_clock_buf[MAX_TRACER_SIZE] __initdata;

static char *trace_boot_clock __initdata;



static int __init set_trace_boot_clock(char *str)
{
	strlcpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE);
	trace_boot_clock = trace_boot_clock_buf;
	return 0;
}
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__setup("trace_clock=", set_trace_boot_clock);



static int __init set_tracepoint_printk(char *str)
{
	if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0))
		tracepoint_printk = 1;
	return 1;
}
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__setup("tp_printk", set_tracepoint_printk);



unsigned long long ns2usecs(cycle_t nsec)
{
	nsec += 500;
	do_div(nsec, 1000);
	return nsec;
}

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/* trace_flags holds trace_options default values */

#define TRACE_DEFAULT_FLAGS						\
	(FUNCTION_DEFAULT_FLAGS |                                       \
         TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |                  \
         TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO |                \
         TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE |                 \
         TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS)

/* trace_options that are only supported by global_trace */

#define TOP_LEVEL_TRACE_FLAGS (TRACE_ITER_PRINTK |                    \
               TRACE_ITER_PRINTK_MSGONLY | TRACE_ITER_RECORD_CMD)

/* trace_flags that are default zero for instances */

#define ZEROED_TRACE_FLAGS \
	TRACE_ITER_EVENT_FORK

/*
 * The global_trace is the descriptor that holds the tracing
 * buffers for the live tracing. For each CPU, it contains
 * a link list of pages that will store trace entries. The
 * page descriptor of the pages in the memory is used to hold
 * the link list by linking the lru item in the page descriptor
 * to each of the pages in the buffer per CPU.
 *
 * For each active CPU there is a data field that holds the
 * pages for the buffer for that CPU. Each CPU has the same number
 * of pages allocated for its buffer.
 */

static struct trace_array global_trace = {
	.trace_flags = TRACE_DEFAULT_FLAGS,
};


LIST_HEAD(ftrace_trace_arrays);



int trace_array_get(struct trace_array *this_tr)
{
	struct trace_array *tr;
	int ret = -ENODEV;

	mutex_lock(&trace_types_lock);
	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
		if (tr == this_tr) {
			tr->ref++;
			ret = 0;
			break;
		}
	}
	mutex_unlock(&trace_types_lock);

	return ret;
}

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static void __trace_array_put(struct trace_array *this_tr)
{
	WARN_ON(!this_tr->ref);
	this_tr->ref--;
}

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void trace_array_put(struct trace_array *this_tr)
{
	mutex_lock(&trace_types_lock);
	__trace_array_put(this_tr);
	mutex_unlock(&trace_types_lock);
}

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int call_filter_check_discard(struct trace_event_call *call, void *rec,
			      struct ring_buffer *buffer,
			      struct ring_buffer_event *event)
{
	if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
	    !filter_match_preds(call->filter, rec)) {
		__trace_event_discard_commit(buffer, event);
		return 1;
	}

	return 0;
}

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static cycle_t buffer_ftrace_now(struct trace_buffer *buf, int cpu)
{
	u64 ts;

	/* Early boot up does not have a buffer yet */
	if (!buf->buffer)
		return trace_clock_local();

	ts = ring_buffer_time_stamp(buf->buffer, cpu);
	ring_buffer_normalize_time_stamp(buf->buffer, cpu, &ts);

	return ts;
}

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fabian frederick fabian frederick 1 1.82% 1 16.67%
Total 55 100.00% 6 100.00%



cycle_t ftrace_now(int cpu)
{
	return buffer_ftrace_now(&global_trace.trace_buffer, cpu);
}

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/**
 * tracing_is_enabled - Show if global_trace has been disabled
 *
 * Shows if the global trace has been enabled or not. It uses the
 * mirror flag "buffer_disabled" to be used in fast paths such as for
 * the irqsoff tracer. But it may be inaccurate due to races. If you
 * need to know the accurate state, use tracing_is_on() which is a little
 * slower, but accurate.
 */


int tracing_is_enabled(void)
{
	/*
         * For quick access (irqsoff uses this in fast path), just
         * return the mirror variable of the state of the ring buffer.
         * It's a little racy, but we don't really care.
         */
	smp_rmb();
	return !global_trace.buffer_disabled;
}

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/*
 * trace_buf_size is the size in bytes that is allocated
 * for a buffer. Note, the number of bytes is always rounded
 * to page size.
 *
 * This number is purposely set to a low number of 16384.
 * If the dump on oops happens, it will be much appreciated
 * to not have to wait for all that output. Anyway this can be
 * boot time and run time configurable.
 */

#define TRACE_BUF_SIZE_DEFAULT	1441792UL 
/* 16384 * 88 (sizeof(entry)) */


static unsigned long		trace_buf_size = TRACE_BUF_SIZE_DEFAULT;

/* trace_types holds a link list of available tracers. */

static struct tracer		*trace_types __read_mostly;

/*
 * trace_types_lock is used to protect the trace_types list.
 */

DEFINE_MUTEX(trace_types_lock);

/*
 * serialize the access of the ring buffer
 *
 * ring buffer serializes readers, but it is low level protection.
 * The validity of the events (which returns by ring_buffer_peek() ..etc)
 * are not protected by ring buffer.
 *
 * The content of events may become garbage if we allow other process consumes
 * these events concurrently:
 *   A) the page of the consumed events may become a normal page
 *      (not reader page) in ring buffer, and this page will be rewrited
 *      by events producer.
 *   B) The page of the consumed events may become a page for splice_read,
 *      and this page will be returned to system.
 *
 * These primitives allow multi process access to different cpu ring buffer
 * concurrently.
 *
 * These primitives don't distinguish read-only and read-consume access.
 * Multi read-only access are also serialized.
 */

#ifdef CONFIG_SMP
static DECLARE_RWSEM(all_cpu_access_lock);
static DEFINE_PER_CPU(struct mutex, cpu_access_lock);



static inline void trace_access_lock(int cpu)
{
	if (cpu == RING_BUFFER_ALL_CPUS) {
		/* gain it for accessing the whole ring buffer. */
		down_write(&all_cpu_access_lock);
	} else {
		/* gain it for accessing a cpu ring buffer. */

		/* Firstly block other trace_access_lock(RING_BUFFER_ALL_CPUS). */
		down_read(&all_cpu_access_lock);

		/* Secondly block other access to this @cpu ring buffer. */
		mutex_lock(&per_cpu(cpu_access_lock, cpu));
	}
}

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static inline void trace_access_unlock(int cpu)
{
	if (cpu == RING_BUFFER_ALL_CPUS) {
		up_write(&all_cpu_access_lock);
	} else {
		mutex_unlock(&per_cpu(cpu_access_lock, cpu));
		up_read(&all_cpu_access_lock);
	}
}

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static inline void trace_access_lock_init(void)
{
	int cpu;

	for_each_possible_cpu(cpu)
		mutex_init(&per_cpu(cpu_access_lock, cpu));
}

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#else

static DEFINE_MUTEX(access_lock);



static inline void trace_access_lock(int cpu)
{
	(void)cpu;
	mutex_lock(&access_lock);
}

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static inline void trace_access_unlock(int cpu)
{
	(void)cpu;
	mutex_unlock(&access_lock);
}

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static inline void trace_access_lock_init(void)
{
}

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#endif

#ifdef CONFIG_STACKTRACE
static void __ftrace_trace_stack(struct ring_buffer *buffer,
				 unsigned long flags,
				 int skip, int pc, struct pt_regs *regs);
static inline void ftrace_trace_stack(struct trace_array *tr,
				      struct ring_buffer *buffer,
				      unsigned long flags,
				      int skip, int pc, struct pt_regs *regs);

#else


static inline void __ftrace_trace_stack(struct ring_buffer *buffer,
					unsigned long flags,
					int skip, int pc, struct pt_regs *regs)
{
}
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static inline void ftrace_trace_stack(struct trace_array *tr,
				      struct ring_buffer *buffer,
				      unsigned long flags,
				      int skip, int pc, struct pt_regs *regs)
{
}

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#endif



static void tracer_tracing_on(struct trace_array *tr)
{
	if (tr->trace_buffer.buffer)
		ring_buffer_record_on(tr->trace_buffer.buffer);
	/*
         * This flag is looked at when buffers haven't been allocated
         * yet, or by some tracers (like irqsoff), that just want to
         * know if the ring buffer has been disabled, but it can handle
         * races of where it gets disabled but we still do a record.
         * As the check is in the fast path of the tracers, it is more
         * important to be fast than accurate.
         */
	tr->buffer_disabled = 0;
	/* Make the flag seen by readers */
	smp_wmb();
}

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/**
 * tracing_on - enable tracing buffers
 *
 * This function enables tracing buffers that may have been
 * disabled with tracing_off.
 */


void tracing_on(void)
{
	tracer_tracing_on(&global_trace);
}
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EXPORT_SYMBOL_GPL(tracing_on);

/**
 * __trace_puts - write a constant string into the trace buffer.
 * @ip:    The address of the caller
 * @str:   The constant string to write
 * @size:  The size of the string.
 */


int __trace_puts(unsigned long ip, const char *str, int size)
{
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	struct print_entry *entry;
	unsigned long irq_flags;
	int alloc;
	int pc;

	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
		return 0;

	pc = preempt_count();

	if (unlikely(tracing_selftest_running || tracing_disabled))
		return 0;

	alloc = sizeof(*entry) + size + 2; /* possible \n added */

	local_save_flags(irq_flags);
	buffer = global_trace.trace_buffer.buffer;
	event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc, 
					  irq_flags, pc);
	if (!event)
		return 0;

	entry = ring_buffer_event_data(event);
	entry->ip = ip;

	memcpy(&entry->buf, str, size);

	/* Add a newline if necessary */
	if (entry->buf[size - 1] != '\n') {
		entry->buf[size] = '\n';
		entry->buf[size + 1] = '\0';
	} else
		entry->buf[size] = '\0';

	__buffer_unlock_commit(buffer, event);
	ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL);

	return size;
}
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Total 219 100.00% 11 100.00%


EXPORT_SYMBOL_GPL(__trace_puts);

/**
 * __trace_bputs - write the pointer to a constant string into trace buffer
 * @ip:    The address of the caller
 * @str:   The constant string to write to the buffer to
 */


int __trace_bputs(unsigned long ip, const char *str)
{
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	struct bputs_entry *entry;
	unsigned long irq_flags;
	int size = sizeof(struct bputs_entry);
	int pc;

	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
		return 0;

	pc = preempt_count();

	if (unlikely(tracing_selftest_running || tracing_disabled))
		return 0;

	local_save_flags(irq_flags);
	buffer = global_trace.trace_buffer.buffer;
	event = trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size,
					  irq_flags, pc);
	if (!event)
		return 0;

	entry = ring_buffer_event_data(event);
	entry->ip			= ip;
	entry->str			= str;

	__buffer_unlock_commit(buffer, event);
	ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL);

	return 1;
}
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Total 157 100.00% 8 100.00%


EXPORT_SYMBOL_GPL(__trace_bputs);

#ifdef CONFIG_TRACER_SNAPSHOT
/**
 * trace_snapshot - take a snapshot of the current buffer.
 *
 * This causes a swap between the snapshot buffer and the current live
 * tracing buffer. You can use this to take snapshots of the live
 * trace when some condition is triggered, but continue to trace.
 *
 * Note, make sure to allocate the snapshot with either
 * a tracing_snapshot_alloc(), or by doing it manually
 * with: echo 1 > /sys/kernel/debug/tracing/snapshot
 *
 * If the snapshot buffer is not allocated, it will stop tracing.
 * Basically making a permanent snapshot.
 */


void tracing_snapshot(void)
{
	struct trace_array *tr = &global_trace;
	struct tracer *tracer = tr->current_trace;
	unsigned long flags;

	if (in_nmi()) {
		internal_trace_puts("*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n");
		internal_trace_puts("*** snapshot is being ignored        ***\n");
		return;
	}

	if (!tr->allocated_snapshot) {
		internal_trace_puts("*** SNAPSHOT NOT ALLOCATED ***\n");
		internal_trace_puts("*** stopping trace here!   ***\n");
		tracing_off();
		return;
	}

	/* Note, snapshot can not be used when the tracer uses it */
	if (tracer->use_max_tr) {
		internal_trace_puts("*** LATENCY TRACER ACTIVE ***\n");
		internal_trace_puts("*** Can not use snapshot (sorry) ***\n");
		return;
	}

	local_irq_save(flags);
	update_max_tr(tr, current, smp_processor_id());
	local_irq_restore(flags);
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 87 79.82% 5 71.43%
jiri olsa jiri olsa 19 17.43% 1 14.29%
zhao lei zhao lei 3 2.75% 1 14.29%
Total 109 100.00% 7 100.00%


EXPORT_SYMBOL_GPL(tracing_snapshot);

static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf,
					struct trace_buffer *size_buf, int cpu_id);
static void set_buffer_entries(struct trace_buffer *buf, unsigned long val);



static int alloc_snapshot(struct trace_array *tr)
{
	int ret;

	if (!tr->allocated_snapshot) {

		/* allocate spare buffer */
		ret = resize_buffer_duplicate_size(&tr->max_buffer,
				   &tr->trace_buffer, RING_BUFFER_ALL_CPUS);
		if (ret < 0)
			return ret;

		tr->allocated_snapshot = true;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 32 54.24% 2 66.67%
jiri olsa jiri olsa 27 45.76% 1 33.33%
Total 59 100.00% 3 100.00%



static void free_snapshot(struct trace_array *tr)
{
	/*
         * We don't free the ring buffer. instead, resize it because
         * The max_tr ring buffer has some state (e.g. ring->clock) and
         * we want preserve it.
         */
	ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS);
	set_buffer_entries(&tr->max_buffer, 1);
	tracing_reset_online_cpus(&tr->max_buffer);
	tr->allocated_snapshot = false;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 40 81.63% 1 25.00%
jiri olsa jiri olsa 7 14.29% 1 25.00%
li zefan li zefan 1 2.04% 1 25.00%
fabian frederick fabian frederick 1 2.04% 1 25.00%
Total 49 100.00% 4 100.00%

/**
 * tracing_alloc_snapshot - allocate snapshot buffer.
 *
 * This only allocates the snapshot buffer if it isn't already
 * allocated - it doesn't also take a snapshot.
 *
 * This is meant to be used in cases where the snapshot buffer needs
 * to be set up for events that can't sleep but need to be able to
 * trigger a snapshot.
 */


int tracing_alloc_snapshot(void)
{
	struct trace_array *tr = &global_trace;
	int ret;

	ret = alloc_snapshot(tr);
	WARN_ON(ret < 0);

	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 20 57.14% 1 33.33%
jiri olsa jiri olsa 8 22.86% 1 33.33%
tom zanussi tom zanussi 7 20.00% 1 33.33%
Total 35 100.00% 3 100.00%


EXPORT_SYMBOL_GPL(tracing_alloc_snapshot);

/**
 * trace_snapshot_alloc - allocate and take a snapshot of the current buffer.
 *
 * This is similar to trace_snapshot(), but it will allocate the
 * snapshot buffer if it isn't already allocated. Use this only
 * where it is safe to sleep, as the allocation may sleep.
 *
 * This causes a swap between the snapshot buffer and the current live
 * tracing buffer. You can use this to take snapshots of the live
 * trace when some condition is triggered, but continue to trace.
 */


void tracing_snapshot_alloc(void)
{
	int ret;

	ret = tracing_alloc_snapshot();
	if (ret < 0)
		return;

	tracing_snapshot();
}
Contributors
Person Tokens Prop Commits CommitProp
tom zanussi tom zanussi 19 76.00% 1 25.00%
steven rostedt steven rostedt 4 16.00% 2 50.00%
jiri olsa jiri olsa 2 8.00% 1 25.00%
Total 25 100.00% 4 100.00%


EXPORT_SYMBOL_GPL(tracing_snapshot_alloc);
#else


void tracing_snapshot(void)
{
	WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used");
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 12 85.71% 1 50.00%
jiri olsa jiri olsa 2 14.29% 1 50.00%
Total 14 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(tracing_snapshot);


int tracing_alloc_snapshot(void)
{
	WARN_ONCE(1, "Snapshot feature not enabled, but snapshot allocation used");
	return -ENODEV;
}
Contributors
Person Tokens Prop Commits CommitProp
tom zanussi tom zanussi 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(tracing_alloc_snapshot);


void tracing_snapshot_alloc(void)
{
	/* Give warning */
	tracing_snapshot();
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 9 81.82% 1 50.00%
jiri olsa jiri olsa 2 18.18% 1 50.00%
Total 11 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(tracing_snapshot_alloc);
#endif /* CONFIG_TRACER_SNAPSHOT */



static void tracer_tracing_off(struct trace_array *tr)
{
	if (tr->trace_buffer.buffer)
		ring_buffer_record_off(tr->trace_buffer.buffer);
	/*
         * This flag is looked at when buffers haven't been allocated
         * yet, or by some tracers (like irqsoff), that just want to
         * know if the ring buffer has been disabled, but it can handle
         * races of where it gets disabled but we still do a record.
         * As the check is in the fast path of the tracers, it is more
         * important to be fast than accurate.
         */
	tr->buffer_disabled = 1;
	/* Make the flag seen by readers */
	smp_wmb();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 36 92.31% 5 83.33%
jiri olsa jiri olsa 3 7.69% 1 16.67%
Total 39 100.00% 6 100.00%

/**
 * tracing_off - turn off tracing buffers
 *
 * This function stops the tracing buffers from recording data.
 * It does not disable any overhead the tracers themselves may
 * be causing. This function simply causes all recording to
 * the ring buffers to fail.
 */


void tracing_off(void)
{
	tracer_tracing_off(&global_trace);
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 12 92.31% 1 50.00%
jiri olsa jiri olsa 1 7.69% 1 50.00%
Total 13 100.00% 2 100.00%


EXPORT_SYMBOL_GPL(tracing_off);



void disable_trace_on_warning(void)
{
	if (__disable_trace_on_warning)
		tracing_off();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%

/**
 * tracer_tracing_is_on - show real state of ring buffer enabled
 * @tr : the trace array to know if ring buffer is enabled
 *
 * Shows real state of the ring buffer if it is enabled or not.
 */


static int tracer_tracing_is_on(struct trace_array *tr)
{
	if (tr->trace_buffer.buffer)
		return ring_buffer_record_is_on(tr->trace_buffer.buffer);
	return !tr->buffer_disabled;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 32 91.43% 4 80.00%
jiri olsa jiri olsa 3 8.57% 1 20.00%
Total 35 100.00% 5 100.00%

/**
 * tracing_is_on - show state of ring buffers enabled
 */


int tracing_is_on(void)
{
	return tracer_tracing_is_on(&global_trace);
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(tracing_is_on);



static int __init set_buf_size(char *str)
{
	unsigned long buf_size;

	if (!str)
		return 0;
	buf_size = memparse(str, &str);
	/* nr_entries can not be zero */
	if (buf_size == 0)
		return 0;
	trace_buf_size = buf_size;
	return 1;
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 47 94.00% 6 85.71%
li zefan li zefan 3 6.00% 1 14.29%
Total 50 100.00% 7 100.00%

__setup("trace_buf_size=", set_buf_size);



static int __init set_tracing_thresh(char *str)
{
	unsigned long threshold;
	int ret;

	if (!str)
		return 0;
	ret = kstrtoul(str, 0, &threshold);
	if (ret < 0)
		return 0;
	tracing_thresh = threshold * 1000;
	return 1;
}
Contributors
Person Tokens Prop Commits CommitProp
tim bird tim bird 33 58.93% 1 20.00%
eduard gabriel munteanu eduard gabriel munteanu 18 32.14% 1 20.00%
wang tianhong wang tianhong 3 5.36% 1 20.00%
daniel walter daniel walter 1 1.79% 1 20.00%
dmitri vorobiev dmitri vorobiev 1 1.79% 1 20.00%
Total 56 100.00% 5 100.00%

__setup("tracing_thresh=", set_tracing_thresh);



unsigned long nsecs_to_usecs(unsigned long nsecs)
{
	return nsecs / 1000;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 12 80.00% 1 50.00%
eduard gabriel munteanu eduard gabriel munteanu 3 20.00% 1 50.00%
Total 15 100.00% 2 100.00%

/*
 * TRACE_FLAGS is defined as a tuple matching bit masks with strings.
 * It uses C(a, b) where 'a' is the enum name and 'b' is the string that
 * matches it. By defining "C(a, b) b", TRACE_FLAGS becomes a list
 * of strings in the order that the enums were defined.
 */

#undef C

#define C(a, b) b

/* These must match the bit postions in trace_iterator_flags */

static const char *trace_options[] = {
	TRACE_FLAGS
	NULL
};

static struct {
	
u64 (*func)(void);
	
const char *name;
	
int in_ns;		/* is this clock in nanoseconds? */
} 
trace_clocks[] = {
	{ trace_clock_local,		"local",	1 },
	{ trace_clock_global,		"global",	1 },
	{ trace_clock_counter,		"counter",	0 },
	{ trace_clock_jiffies,		"uptime",	0 },
	{ trace_clock,			"perf",		1 },
	{ ktime_get_mono_fast_ns,	"mono",		1 },
	{ ktime_get_raw_fast_ns,	"mono_raw",	1 },
	ARCH_TRACE_CLOCKS
};

/*
 * trace_parser_get_init - gets the buffer for trace parser
 */


int trace_parser_get_init(struct trace_parser *parser, int size)
{
	memset(parser, 0, sizeof(*parser));

	parser->buffer = kmalloc(size, GFP_KERNEL);
	if (!parser->buffer)
		return 1;

	parser->size = size;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
jiri olsa jiri olsa 34 60.71% 1 50.00%
steven rostedt steven rostedt 22 39.29% 1 50.00%
Total 56 100.00% 2 100.00%

/*
 * trace_parser_put - frees the buffer for trace parser
 */


void trace_parser_put(struct trace_parser *parser)
{
	kfree(parser->buffer);
}

Contributors
Person Tokens Prop Commits CommitProp
ingo molnar ingo molnar 10 58.82% 1 33.33%
jiri olsa jiri olsa 5 29.41% 1 33.33%
steven rostedt steven rostedt 2 11.76% 1 33.33%
Total 17 100.00% 3 100.00%

/*
 * trace_get_user - reads the user input string separated by  space
 * (matched by isspace(ch))
 *
 * For each string found the 'struct trace_parser' is updated,
 * and the function returns.
 *
 * Returns number of bytes read.
 *
 * See kernel/trace/trace.h for 'struct trace_parser' details.
 */


int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
	size_t cnt, loff_t *ppos)
{
	char ch;
	size_t read = 0;
	ssize_t ret;

	if (!*ppos)
		trace_parser_clear(parser);

	ret = get_user(ch, ubuf++);
	if (ret)
		goto out;

	read++;
	cnt--;

	/*
         * The parser is not finished with the last write,
         * continue reading the user input without skipping spaces.
         */
	if (!parser->cont) {
		/* skip white space */
		while (cnt && isspace(ch)) {
			ret = get_user(ch, ubuf++);
			if (ret)
				goto out;
			read++;
			cnt--;
		}

		/* only spaces were written */
		if (isspace(ch)) {
			*ppos += read;
			ret = read;
			goto out;
		}

		parser->idx = 0;
	}

	/* read the non-space input */
	while (cnt && !isspace(ch)) {
		if (parser->idx < parser->size - 1)
			parser->buffer[parser->idx++] = ch;
		else {
			ret = -EINVAL;
			goto out;
		}
		ret = get_user(ch, ubuf++);
		if (ret)
			goto out;
		read++;
		cnt--;
	}

	/* We either got finished input or we have to wait for another call. */
	if (isspace(ch)) {
		parser->buffer[parser->idx] = 0;
		parser->cont = false;
	} else if (parser->idx < parser->size - 1) {
		parser->cont = true;
		parser->buffer[parser->idx++] = ch;
	} else {
		ret = -EINVAL;
		goto out;
	}

	*ppos += read;
	ret = read;

out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
jiri olsa jiri olsa 182 61.28% 1 6.25%
steven rostedt steven rostedt 66 22.22% 6 37.50%
pekka paalanen pekka paalanen 18 6.06% 1 6.25%
ingo molnar ingo molnar 12 4.04% 1 6.25%
li zefan li zefan 7 2.36% 2 12.50%
torok edwin torok edwin 4 1.35% 1 6.25%
frederic weisbecker frederic weisbecker 4 1.35% 1 6.25%
harvey harrison harvey harrison 2 0.67% 1 6.25%
hiraku toyooka hiraku toyooka 1 0.34% 1 6.25%
kosaki motohiro kosaki motohiro 1 0.34% 1 6.25%
Total 297 100.00% 16 100.00%

/* TODO add a seq_buf_to_buffer() */


static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
{
	int len;

	if (trace_seq_used(s) <= s->seq.readpos)
		return -EBUSY;

	len = trace_seq_used(s) - s->seq.readpos;
	if (cnt > len)
		cnt = len;
	memcpy(buf, s->buffer + s->seq.readpos, cnt);

	s->seq.readpos += cnt;
	return cnt;
}

Contributors
Person Tokens Prop Commits CommitProp
eduard gabriel munteanu eduard gabriel munteanu 55 61.80% 1 9.09%
steven rostedt steven rostedt 26 29.21% 7 63.64%
hiraku toyooka hiraku toyooka 6 6.74% 1 9.09%
dmitri vorobiev dmitri vorobiev 1 1.12% 1 9.09%
vaibhav nagarnaik vaibhav nagarnaik 1 1.12% 1 9.09%
Total 89 100.00% 11 100.00%


unsigned long __read_mostly	tracing_thresh;

#ifdef CONFIG_TRACER_MAX_TRACE
/*
 * Copy the new maximum trace into the separate maximum-trace
 * structure. (this way the maximum trace is permanently saved,
 * for later retrieval via /sys/kernel/debug/tracing/latency_trace)
 */

static void

__update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
	struct trace_buffer *trace_buf = &tr->trace_buffer;
	struct trace_buffer *max_buf = &tr->max_buffer;
	struct trace_array_cpu *data = per_cpu_ptr(trace_buf->data, cpu);
	struct trace_array_cpu *max_data = per_cpu_ptr(max_buf->data, cpu);

	max_buf->cpu = cpu;
	max_buf->time_start = data->preempt_timestamp;

	max_data->saved_latency = tr->max_latency;
	max_data->critical_start = data->critical_start;
	max_data->critical_end = data->critical_end;

	memcpy(max_data->comm, tsk->comm, TASK_COMM_LEN);
	max_data->pid = tsk->pid;
	/*
         * If tsk == current, then use current_uid(), as that does not use
         * RCU. The irq tracer can be called out of RCU scope.
         */
	if (tsk == current)
		max_data->uid = current_uid();
	else
		max_data->uid = task_uid(tsk);

	max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
	max_data->policy = tsk->policy;
	max_data->rt_priority = tsk->rt_priority;

	/* record this tasks comm */
	tracing_record_cmdline(tsk);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 178 96.74% 11 73.33%
ingo molnar ingo molnar 5 2.72% 3 20.00%
arnaldo carvalho de melo arnaldo carvalho de melo 1 0.54% 1 6.67%
Total 184 100.00% 15 100.00%

/**
 * update_max_tr - snapshot all trace buffers from global_trace to max_tr
 * @tr: tracer
 * @tsk: the task with the latency
 * @cpu: The cpu that initiated the trace.
 *
 * Flip the buffers between the @tr and the max_tr and record information
 * about which task was the cause of this latency.
 */

void

update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
	struct ring_buffer *buf;

	if (tr->stop_count)
		return;

	WARN_ON_ONCE(!irqs_disabled());

	if (!tr->allocated_snapshot) {
		/* Only the nop tracer should hit this when disabling */
		WARN_ON_ONCE(tr->current_trace != &nop_trace);
		return;
	}

	arch_spin_lock(&tr->max_lock);

	buf = tr->trace_buffer.buffer;
	tr->trace_buffer.buffer = tr->max_buffer.buffer;
	tr->max_buffer.buffer = buf;

	__update_max_tr(tr, tsk, cpu);
	arch_spin_unlock(&tr->max_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 85 76.58% 8 66.67%
ingo molnar ingo molnar 10 9.01% 1 8.33%
hiraku toyooka hiraku toyooka 8 7.21% 1 8.33%
kosaki motohiro kosaki motohiro 6 5.41% 1 8.33%
thomas gleixner thomas gleixner 2 1.80% 1 8.33%
Total 111 100.00% 12 100.00%

/**
 * update_max_tr_single - only copy one trace over, and reset the rest
 * @tr - tracer
 * @tsk - task with the latency
 * @cpu - the cpu of the buffer to copy.
 *
 * Flip the trace of a single CPU buffer between the @tr and the max_tr.
 */

void

update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
	int ret;

	if (tr->stop_count)
		return;

	WARN_ON_ONCE(!irqs_disabled());
	if (!tr->allocated_snapshot) {
		/* Only the nop tracer should hit this when disabling */
		WARN_ON_ONCE(tr->current_trace != &nop_trace);
		return;
	}

	arch_spin_lock(&tr->max_lock);

	ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->trace_buffer.buffer, cpu);

	if (ret == -EBUSY) {
		/*
                 * We failed to swap the buffer due to a commit taking
                 * place on this CPU. We fail to record, but we reset
                 * the max trace buffer (no one writes directly to it)
                 * and flag that it failed.
                 */
		trace_array_printk_buf(tr->max_buffer.buffer, _THIS_IP_,
			"Failed to swap buffers due to commit in progress\n");
	}

	WARN_ON_ONCE(ret && ret != -EAGAIN && ret != -EBUSY);

	__update_max_tr(tr, tsk, cpu);
	arch_spin_unlock(&tr->max_lock);
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 99 71.74% 12 57.14%
ingo molnar ingo molnar 19 13.77% 3 14.29%
linus torvalds linus torvalds 9 6.52% 1 4.76%
harvey harrison harvey harrison 3 2.17% 1 4.76%
kosaki motohiro kosaki motohiro 3 2.17% 1 4.76%
torok edwin torok edwin 2 1.45% 1 4.76%
thomas gleixner thomas gleixner 2 1.45% 1 4.76%
hiraku toyooka hiraku toyooka 1 0.72% 1 4.76%
Total 138 100.00% 21 100.00%

#endif /* CONFIG_TRACER_MAX_TRACE */



static int wait_on_pipe(struct trace_iterator *iter, bool full)
{
	/* Iterators are static, they should be filled or empty */
	if (trace_buffer_iter(iter, iter->cpu_file))
		return 0;

	return ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file,
				full);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 40 88.89% 6 85.71%
rabin vincent rabin vincent 5 11.11% 1 14.29%
Total 45 100.00% 7 100.00%

#ifdef CONFIG_FTRACE_STARTUP_TEST


static int run_tracer_selftest(struct tracer *type)
{
	struct trace_array *tr = &global_trace;
	struct tracer *saved_tracer = tr->current_trace;
	int ret;

	if (!type->selftest || tracing_selftest_disabled)
		return 0;

	/*
         * Run a selftest on this tracer.
         * Here we reset the trace buffer, and set the current
         * tracer to be this tracer. The tracer can then run some
         * internal tracing to verify that everything is in order.
         * If we fail, we do not register this tracer.
         */
	tracing_reset_online_cpus(&tr->trace_buffer);

	tr->current_trace = type;

#ifdef CONFIG_TRACER_MAX_TRACE
	if (type->use_max_tr) {
		/* If we expanded the buffers, make sure the max is expanded too */
		if (ring_buffer_expanded)
			ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size,
					   RING_BUFFER_ALL_CPUS);
		tr->allocated_snapshot = true;
	}
#endif

	/* the test is responsible for initializing and enabling */
	pr_info("Testing tracer %s: ", type->name);
	ret = type->selftest(type, tr);
	/* the test is responsible for resetting too */
	tr->current_trace = saved_tracer;
	if (ret) {
		printk(KERN_CONT "FAILED!\n");
		/* Add the warning after printing 'FAILED' */
		WARN_ON(1);
		return -1;
	}
	/* Only reset on passing, to avoid touching corrupted buffers */
	tracing_reset_online_cpus(&tr->trace_buffer);

#ifdef CONFIG_TRACER_MAX_TRACE
	if (type->use_max_tr) {
		tr->allocated_snapshot = false;

		/* Shrink the max buffer again */
		if (ring_buffer_expanded)
			ring_buffer_resize(tr->max_buffer.buffer, 1,
					   RING_BUFFER_ALL_CPUS);
	}
#endif

	printk(KERN_CONT "PASSED\n");
	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 184 92.00% 7 58.33%
ingo molnar ingo molnar 10 5.00% 2 16.67%
peter zijlstra peter zijlstra 3 1.50% 2 16.67%
torok edwin torok edwin 3 1.50% 1 8.33%
Total 200 100.00% 12 100.00%

#else


static inline int run_tracer_selftest(struct tracer *type)
{
	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 15 100.00% 2 100.00%
Total 15 100.00% 2 100.00%

#endif /* CONFIG_FTRACE_STARTUP_TEST */

static void add_tracer_options(struct trace_array *tr, struct tracer *t);

static void __init apply_trace_boot_options(void);

/**
 * register_tracer - register a tracer with the ftrace system.
 * @type - the plugin for the tracer
 *
 * Register a new plugin tracer.
 */


int __init register_tracer(struct tracer *type)
{
	struct tracer *t;
	int ret = 0;

	if (!type->name) {
		pr_info("Tracer must have a name\n");
		return -1;
	}

	if (strlen(type->name) >= MAX_TRACER_SIZE) {
		pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE);
		return -1;
	}

	mutex_lock(&trace_types_lock);

	tracing_selftest_running = true;

	for (t = trace_types; t; t = t->next) {
		if (strcmp(type->name, t->name) == 0) {
			/* already found */
			pr_info("Tracer %s already registered\n",
				type->name);
			ret = -1;
			goto out;
		}
	}

	if (!type->set_flag)
		type->set_flag = &dummy_set_flag;
	if (!type->flags) {
		/*allocate a dummy tracer_flags*/
		type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL);
		if (!type->flags) {
			ret = -ENOMEM;
			goto out;
		}
		type->flags->val = 0;
		type->flags->opts = dummy_tracer_opt;
	} else
		if (!type->flags->opts)
			type->flags->opts = dummy_tracer_opt;

	/* store the tracer for __set_tracer_option */
	type->flags->trace = type;

	ret = run_tracer_selftest(type);
	if (ret < 0)
		goto out;

	type->next = trace_types;
	trace_types = type;
	add_tracer_options(&global_trace, type);

 out:
	tracing_selftest_running = false;
	mutex_unlock(&trace_types_lock);

	if (ret || !default_bootup_tracer)
		goto out_unlock;

	if (strncmp(default_bootup_tracer, type->name, MAX_TRACER_SIZE))
		goto out_unlock;

	printk(KERN_INFO "Starting tracer '%s'\n", type->name);
	/* Do we want this tracer to start on bootup? */
	tracing_set_tracer(&global_trace, type->name);
	default_bootup_tracer = NULL;

	apply_trace_boot_options();

	/* disable other selftests, since this will break it. */
	tracing_selftest_disabled = true;
#ifdef CONFIG_FTRACE_STARTUP_TEST
	printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n",
	       type->name);
#endif

 out_unlock:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 223 63.71% 17 51.52%
chunyu hu chunyu hu 56 16.00% 2 6.06%
li zefan li zefan 18 5.14% 1 3.03%
pekka paalanen pekka paalanen 14 4.00% 1 3.03%
ingo molnar ingo molnar 13 3.71% 4 12.12%
torok edwin torok edwin 10 2.86% 2 6.06%
frederic weisbecker frederic weisbecker 6 1.71% 2 6.06%
jiaxing wang jiaxing wang 4 1.14% 1 3.03%
thomas gleixner thomas gleixner 4 1.14% 1 3.03%
heiko carstens heiko carstens 1 0.29% 1 3.03%
dan carpenter dan carpenter 1 0.29% 1 3.03%
Total 350 100.00% 33 100.00%



void tracing_reset(struct trace_buffer *buf, int cpu)
{
	struct ring_buffer *buffer = buf->buffer;

	if (!buffer)
		return;

	ring_buffer_record_disable(buffer);

	/* Make sure all commits have finished */
	synchronize_sched();
	ring_buffer_reset_cpu(buffer, cpu);

	ring_buffer_record_enable(buffer);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 40 81.63% 10 83.33%
ingo molnar ingo molnar 8 16.33% 1 8.33%
hiraku toyooka hiraku toyooka 1 2.04% 1 8.33%
Total 49 100.00% 12 100.00%



void tracing_reset_online_cpus(struct trace_buffer *buf)
{
	struct ring_buffer *buffer = buf->buffer;
	int cpu;

	if (!buffer)
		return;

	ring_buffer_record_disable(buffer);

	/* Make sure all commits have finished */
	synchronize_sched();

	buf->time_start = buffer_ftrace_now(buf, buf->cpu);

	for_each_online_cpu(cpu)
		ring_buffer_reset_cpu(buffer, cpu);

	ring_buffer_record_enable(buffer);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 31 46.97% 5 41.67%
ingo molnar ingo molnar 15 22.73% 3 25.00%
arnaldo carvalho de melo arnaldo carvalho de melo 9 13.64% 1 8.33%
hiraku toyooka hiraku toyooka 6 9.09% 1 8.33%
alexander z lam alexander z lam 3 4.55% 1 8.33%
frederic weisbecker frederic weisbecker 2 3.03% 1 8.33%
Total 66 100.00% 12 100.00%

/* Must have trace_types_lock held */


void tracing_reset_all_online_cpus(void)
{
	struct trace_array *tr;

	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
		tracing_reset_online_cpus(&tr->trace_buffer);
#ifdef CONFIG_TRACER_MAX_TRACE
		tracing_reset_online_cpus(&tr->max_buffer);
#endif
	}
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 28 65.12% 3 60.00%
arnaldo carvalho de melo arnaldo carvalho de melo 11 25.58% 1 20.00%
frederic weisbecker frederic weisbecker 4 9.30% 1 20.00%
Total 43 100.00% 5 100.00%


#define SAVED_CMDLINES_DEFAULT 128

#define NO_CMDLINE_MAP UINT_MAX

static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED;

struct saved_cmdlines_buffer {
	
unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
	
unsigned *map_cmdline_to_pid;
	
unsigned cmdline_num;
	
int cmdline_idx;
	
char *saved_cmdlines;
};

static struct saved_cmdlines_buffer *savedcmd;

/* temporary disable recording */

static atomic_t trace_record_cmdline_disabled __read_mostly;



static inline char *get_saved_cmdlines(int idx)
{
	return &savedcmd->saved_cmdlines[idx * TASK_COMM_LEN];
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 20 90.91% 1 50.00%
steven rostedt steven rostedt 2 9.09% 1 50.00%
Total 22 100.00% 2 100.00%



static inline void set_cmdline(int idx, const char *cmdline)
{
	memcpy(get_saved_cmdlines(idx), cmdline, TASK_COMM_LEN);
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 26 96.30% 1 50.00%
steven rostedt steven rostedt 1 3.70% 1 50.00%
Total 27 100.00% 2 100.00%



static int allocate_cmdlines_buffer(unsigned int val,
				    struct saved_cmdlines_buffer *s)
{
	s->map_cmdline_to_pid = kmalloc(val * sizeof(*s->map_cmdline_to_pid),
					GFP_KERNEL);
	if (!s->map_cmdline_to_pid)
		return -ENOMEM;

	s->saved_cmdlines = kmalloc(val * TASK_COMM_LEN, GFP_KERNEL);
	if (!s->saved_cmdlines) {
		kfree(s->map_cmdline_to_pid);
		return -ENOMEM;
	}

	s->cmdline_idx = 0;
	s->cmdline_num = val;
	memset(&s->map_pid_to_cmdline, NO_CMDLINE_MAP,
	       sizeof(s->map_pid_to_cmdline));
	memset(s->map_cmdline_to_pid, NO_CMDLINE_MAP,
	       val * sizeof(*s->map_cmdline_to_pid));

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 102 79.07% 1 14.29%
steven rostedt steven rostedt 20 15.50% 3 42.86%
ingo molnar ingo molnar 4 3.10% 1 14.29%
thomas gleixner thomas gleixner 2 1.55% 1 14.29%
torok edwin torok edwin 1 0.78% 1 14.29%
Total 129 100.00% 7 100.00%



static int trace_create_savedcmd(void)
{
	int ret;

	savedcmd = kmalloc(sizeof(*savedcmd), GFP_KERNEL);
	if (!savedcmd)
		return -ENOMEM;

	ret = allocate_cmdlines_buffer(SAVED_CMDLINES_DEFAULT, savedcmd);
	if (ret < 0) {
		kfree(savedcmd);
		savedcmd = NULL;
		return -ENOMEM;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 60 90.91% 1 20.00%
ingo molnar ingo molnar 2 3.03% 2 40.00%
namhyung kim namhyung kim 2 3.03% 1 20.00%
steven rostedt steven rostedt 2 3.03% 1 20.00%
Total 66 100.00% 5 100.00%



int is_tracing_stopped(void)
{
	return global_trace.stop_count;
}

Contributors
Person Tokens Prop Commits CommitProp
carsten emde carsten emde 7 58.33% 1 33.33%
steven rostedt steven rostedt 5 41.67% 2 66.67%
Total 12 100.00% 3 100.00%

/**
 * tracing_start - quick start of the tracer
 *
 * If tracing is enabled but was stopped by tracing_stop,
 * this will start the tracer back up.
 */


void tracing_start(void)
{
	struct ring_buffer *buffer;
	unsigned long flags;

	if (tracing_disabled)
		return;

	raw_spin_lock_irqsave(&global_trace.start_lock, flags);
	if (--global_trace.stop_count) {
		if (global_trace.stop_count < 0) {
			/* Someone screwed up their debugging */
			WARN_ON_ONCE(1);
			global_trace.stop_count = 0;
		}
		goto out;
	}

	/* Prevent the buffers from switching */
	arch_spin_lock(&global_trace.max_lock);

	buffer = global_trace.trace_buffer.buffer;
	if (buffer)
		ring_buffer_record_enable(buffer);

#ifdef CONFIG_TRACER_MAX_TRACE
	buffer = global_trace.max_buffer.buffer;
	if (buffer)
		ring_buffer_record_enable(buffer);
#endif

	arch_spin_unlock(&global_trace.max_lock);

 out:
	raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 111 83.46% 13 68.42%
masami hiramatsu masami hiramatsu 14 10.53% 1 5.26%
peter zijlstra peter zijlstra 3 2.26% 2 10.53%
frederic weisbecker frederic weisbecker 2 1.50% 1 5.26%
thomas gleixner thomas gleixner 2 1.50% 1 5.26%
ingo molnar ingo molnar 1 0.75% 1 5.26%
Total 133 100.00% 19 100.00%



static void tracing_start_tr(struct trace_array *tr)
{
	struct ring_buffer *buffer;
	unsigned long flags;

	if (tracing_disabled)
		return;

	/* If global, we need to also start the max tracer */
	if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
		return tracing_start();

	raw_spin_lock_irqsave(&tr->start_lock, flags);

	if (--tr->stop_count) {
		if (tr->stop_count < 0) {
			/* Someone screwed up their debugging */
			WARN_ON_ONCE(1);
			tr->stop_count = 0;
		}
		goto out;
	}

	buffer = tr->trace_buffer.buffer;
	if (buffer)
		ring_buffer_record_enable(buffer);

 out:
	raw_spin_unlock_irqrestore(&tr->start_lock, flags);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 92 82.88% 7 53.85%
ingo molnar ingo molnar 11 9.91% 3 23.08%
tom zanussi tom zanussi 4 3.60% 1 7.69%
arnaldo carvalho de melo arnaldo carvalho de melo 2 1.80% 1 7.69%
torok edwin torok edwin 2 1.80% 1 7.69%
Total 111 100.00% 13 100.00%

/**
 * tracing_stop - quick stop of the tracer
 *
 * Light weight way to stop tracing. Use in conjunction with
 * tracing_start.
 */


void tracing_stop(void)
{
	struct ring_buffer *buffer;
	unsigned long flags;

	raw_spin_lock_irqsave(&global_trace.start_lock, flags);
	if (global_trace.stop_count++)
		goto out;

	/* Prevent the buffers from switching */
	arch_spin_lock(&global_trace.max_lock);

	buffer = global_trace.trace_buffer.buffer;
	if (buffer)
		ring_buffer_record_disable(buffer);

#ifdef CONFIG_TRACER_MAX_TRACE
	buffer = global_trace.max_buffer.buffer;
	if (buffer)
		ring_buffer_record_disable(buffer);
#endif

	arch_spin_unlock(&global_trace.max_lock);

 out:
	raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 89 85.58% 12 75.00%
ingo molnar ingo molnar 11 10.58% 2 12.50%
thomas gleixner thomas gleixner 2 1.92% 1 6.25%
frederic weisbecker frederic weisbecker 2 1.92% 1 6.25%
Total 104 100.00% 16 100.00%



static void tracing_stop_tr(struct trace_array *tr)
{
	struct ring_buffer *buffer;
	unsigned long flags;

	/* If global, we need to also stop the max tracer */
	if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
		return tracing_stop();

	raw_spin_lock_irqsave(&tr->start_lock, flags);
	if (tr->stop_count++)
		goto out;

	buffer = tr->trace_buffer.buffer;
	if (buffer)
		ring_buffer_record_disable(buffer);

 out:
	raw_spin_unlock_irqrestore(&tr->start_lock, flags);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 74 90.24% 6 75.00%
ingo molnar ingo molnar 7 8.54% 1 12.50%
tom zanussi tom zanussi 1 1.22% 1 12.50%
Total 82 100.00% 8 100.00%

void trace_stop_cmdline_recording(void);



static int trace_save_cmdline(struct task_struct *tsk)
{
	unsigned pid, idx;

	if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT))
		return 0;

	/*
         * It's not the end of the world if we don't get
         * the lock, but we also don't want to spin
         * nor do we want to disable interrupts,
         * so if we miss here, then better luck next time.
         */
	if (!arch_spin_trylock(&trace_cmdline_lock))
		return 0;

	idx = savedcmd->map_pid_to_cmdline[tsk->pid];
	if (idx == NO_CMDLINE_MAP) {
		idx = (savedcmd->cmdline_idx + 1) % savedcmd->cmdline_num;

		/*
                 * Check whether the cmdline buffer at idx has a pid
                 * mapped. We are going to overwrite that entry so we
                 * need to clear the map_pid_to_cmdline. Otherwise we
                 * would read the new comm for the old pid.
                 */
		pid = savedcmd->map_cmdline_to_pid[idx];
		if (pid != NO_CMDLINE_MAP)
			savedcmd->map_pid_to_cmdline[pid] = NO_CMDLINE_MAP;

		savedcmd->map_cmdline_to_pid[idx] = tsk->pid;
		savedcmd->map_pid_to_cmdline[tsk->pid] = idx;

		savedcmd->cmdline_idx = idx;
	}

	set_cmdline(idx, tsk->comm);

	arch_spin_unlock(&trace_cmdline_lock);

	return 1;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 81 53.29% 5 33.33%
yoshihiro yunomae yoshihiro yunomae 18 11.84% 1 6.67%
ingo molnar ingo molnar 18 11.84% 3 20.00%
carsten emde carsten emde 13 8.55% 1 6.67%
frederic weisbecker frederic weisbecker 13 8.55% 1 6.67%
thomas gleixner thomas gleixner 7 4.61% 2 13.33%
torok edwin torok edwin 1 0.66% 1 6.67%
peter zijlstra peter zijlstra 1 0.66% 1 6.67%
Total 152 100.00% 15 100.00%



static void __trace_find_cmdline(int pid, char comm[])
{
	unsigned map;

	if (!pid) {
		strcpy(comm, "<idle>");
		return;
	}

	if (WARN_ON_ONCE(pid < 0)) {
		strcpy(comm, "<XXX>");
		return;
	}

	if (pid > PID_MAX_DEFAULT) {
		strcpy(comm, "<...>");
		return;
	}

	map = savedcmd->map_pid_to_cmdline[pid];
	if (map != NO_CMDLINE_MAP)
		strcpy(comm, get_saved_cmdlines(map));
	else
		strcpy(comm, "<...>");
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 75 75.76% 9 56.25%
masami hiramatsu masami hiramatsu 7 7.07% 1 6.25%
thomas gleixner thomas gleixner 6 6.06% 2 12.50%
yoshihiro yunomae yoshihiro yunomae 5 5.05% 1 6.25%
frederic weisbecker frederic weisbecker 3 3.03% 1 6.25%
tom zanussi tom zanussi 2 2.02% 1 6.25%
ingo molnar ingo molnar 1 1.01% 1 6.25%
Total 99 100.00% 16 100.00%



void trace_find_cmdline(int pid, char comm[])
{
	preempt_disable();
	arch_spin_lock(&trace_cmdline_lock);

	__trace_find_cmdline(pid, comm);

	arch_spin_unlock(&trace_cmdline_lock);
	preempt_enable();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 35 94.59% 4 66.67%
thomas gleixner thomas gleixner 1 2.70% 1 16.67%
heiko carstens heiko carstens 1 2.70% 1 16.67%
Total 37 100.00% 6 100.00%



void tracing_record_cmdline(struct task_struct *tsk)
{
	if (atomic_read(&trace_record_cmdline_disabled) || !tracing_is_on())
		return;

	if (!__this_cpu_read(trace_cmdline_save))
		return;

	if (trace_save_cmdline(tsk))
		__this_cpu_write(trace_cmdline_save, false);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 30 65.22% 5 71.43%
masami hiramatsu masami hiramatsu 14 30.43% 1 14.29%
ingo molnar ingo molnar 2 4.35% 1 14.29%
Total 46 100.00% 7 100.00%


void

tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
			     int pc)
{
	struct task_struct *tsk = current;

	entry->preempt_count		= pc & 0xff;
	entry->pid			= (tsk) ? tsk->pid : 0;
	entry->flags =
#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
		(irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
#else
		TRACE_FLAG_IRQS_NOSUPPORT |
#endif
		((pc & NMI_MASK    ) ? TRACE_FLAG_NMI     : 0) |
		((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
		((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
		(tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) |
		(test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0);
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 85 68.55% 4 44.44%
peter zijlstra peter zijlstra 22 17.74% 2 22.22%
ingo molnar ingo molnar 15 12.10% 2 22.22%
al viro al viro 2 1.61% 1 11.11%
Total 124 100.00% 9 100.00%


EXPORT_SYMBOL_GPL(tracing_generic_entry_update);


static __always_inline void

trace_event_setup(struct ring_buffer_event *event,
		  int type, unsigned long flags, int pc)
{
	struct trace_entry *ent = ring_buffer_event_data(event);

	tracing_generic_entry_update(ent, flags, pc);
	ent->type = type;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%


struct ring_buffer_event *

trace_buffer_lock_reserve(struct ring_buffer *buffer,
			  int type,
			  unsigned long len,
			  unsigned long flags, int pc)
{
	struct ring_buffer_event *event;

	event = ring_buffer_lock_reserve(buffer, len);
	if (event != NULL)
		trace_event_setup(event, type, flags, pc);

	return event;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 30 50.00% 5 62.50%
arnaldo carvalho de melo arnaldo carvalho de melo 27 45.00% 1 12.50%
torok edwin torok edwin 2 3.33% 1 12.50%
li zefan li zefan 1 1.67% 1 12.50%
Total 60 100.00% 8 100.00%

DEFINE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
DEFINE_PER_CPU(int, trace_buffered_event_cnt);

static int trace_buffered_event_ref;

/**
 * trace_buffered_event_enable - enable buffering events
 *
 * When events are being filtered, it is quicker to use a temporary
 * buffer to write the event data into if there's a likely chance
 * that it will not be committed. The discard of the ring buffer
 * is not as fast as committing, and is much slower than copying
 * a commit.
 *
 * When an event is to be filtered, allocate per cpu buffers to
 * write the event data into, and if the event is filtered and discarded
 * it is simply dropped, otherwise, the entire data is to be committed
 * in one shot.
 */


void trace_buffered_event_enable(void)
{
	struct ring_buffer_event *event;
	struct page *page;
	int cpu;

	WARN_ON_ONCE(!mutex_is_locked(&event_mutex));

	if (trace_buffered_event_ref++)
		return;

	for_each_tracing_cpu(cpu) {
		page = alloc_pages_node(cpu_to_node(cpu),
					GFP_KERNEL | __GFP_NORETRY, 0);
		if (!page)
			goto failed;

		event = page_address(page);
		memset(event, 0, sizeof(*event));

		per_cpu(trace_buffered_event, cpu) = event;

		preempt_disable();
		if (cpu == smp_processor_id() &&
		    this_cpu_read(trace_buffered_event) !=
		    per_cpu(trace_buffered_event, cpu))
			WARN_ON_ONCE(1);
		preempt_enable();
	}

	return;
 failed:
	trace_buffered_event_disable();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 126 96.18% 1 50.00%
arnaldo carvalho de melo arnaldo carvalho de melo 5 3.82% 1 50.00%
Total 131 100.00% 2 100.00%



static void enable_trace_buffered_event(void *data)
{
	/* Probably not needed, but do it anyway */
	smp_rmb();
	this_cpu_dec(trace_buffered_event_cnt);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



static void disable_trace_buffered_event(void *data)
{
	this_cpu_inc(trace_buffered_event_cnt);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 14 93.33% 1 50.00%
arnaldo carvalho de melo arnaldo carvalho de melo 1 6.67% 1 50.00%
Total 15 100.00% 2 100.00%

/**
 * trace_buffered_event_disable - disable buffering events
 *
 * When a filter is removed, it is faster to not use the buffered
 * events, and to commit directly into the ring buffer. Free up
 * the temp buffers when there are no more users. This requires
 * special synchronization with current events.
 */


void trace_buffered_event_disable(void)
{
	int cpu;

	WARN_ON_ONCE(!mutex_is_locked(&event_mutex));

	if (WARN_ON_ONCE(!trace_buffered_event_ref))
		return;

	if (--trace_buffered_event_ref)
		return;

	preempt_disable();
	/* For each CPU, set the buffer as used. */
	smp_call_function_many(tracing_buffer_mask,
			       disable_trace_buffered_event, NULL, 1);
	preempt_enable();

	/* Wait for all current users to finish */
	synchronize_sched();

	for_each_tracing_cpu(cpu) {
		free_page((unsigned long)per_cpu(trace_buffered_event, cpu));
		per_cpu(trace_buffered_event, cpu) = NULL;
	}
	/*
         * Make sure trace_buffered_event is NULL before clearing
         * trace_buffered_event_cnt.
         */
	smp_wmb();

	preempt_disable();
	/* Do the work on each cpu */
	smp_call_function_many(tracing_buffer_mask,
			       enable_trace_buffered_event, NULL, 1);
	preempt_enable();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 100 92.59% 2 33.33%
arnaldo carvalho de melo arnaldo carvalho de melo 5 4.63% 1 16.67%
ingo molnar ingo molnar 2 1.85% 2 33.33%
torok edwin torok edwin 1 0.93% 1 16.67%
Total 108 100.00% 6 100.00%


void

__buffer_unlock_commit(struct ring_buffer *buffer, struct ring_buffer_event *event)
{
	__this_cpu_write(trace_cmdline_save, true);

	/* If this is the temp buffer, we need to commit fully */
	if (this_cpu_read(trace_buffered_event) == event) {
		/* Length is in event->array[0] */
		ring_buffer_write(buffer, event->array[0], &event->array[1]);
		/* Release the temp buffer */
		this_cpu_dec(trace_buffered_event_cnt);
	} else
		ring_buffer_unlock_commit(buffer, event);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 69 100.00% 3 100.00%
Total 69 100.00% 3 100.00%


static struct ring_buffer *temp_buffer;


struct ring_buffer_event *

trace_event_buffer_lock_reserve(struct ring_buffer **current_rb,
			  struct trace_event_file *trace_file,
			  int type, unsigned long len,
			  unsigned long flags, int pc)
{
	struct ring_buffer_event *entry;
	int val;

	*current_rb = trace_file->tr->trace_buffer.buffer;

	if ((trace_file->flags &
	     (EVENT_FILE_FL_SOFT_DISABLED | EVENT_FILE_FL_FILTERED)) &&
	    (entry = this_cpu_read(trace_buffered_event))) {
		/* Try to use the per cpu buffer first */
		val = this_cpu_inc_return(trace_buffered_event_cnt);
		if (val == 1) {
			trace_event_setup(entry, type, flags, pc);
			entry->array[0] = len;
			return entry;
		}
		this_cpu_dec(trace_buffered_event_cnt);
	}

	entry = trace_buffer_lock_reserve(*current_rb,
					 type, len, flags, pc);
	/*
         * If tracing is off, but we have triggers enabled
         * we still need to look at the event data. Use the temp_buffer
         * to store the trace event for the tigger to use. It's recusive
         * safe and will not be recorded anywhere.
         */
	if (!entry && trace_file->flags & EVENT_FILE_FL_TRIGGER_COND) {
		*current_rb = temp_buffer;
		entry = trace_buffer_lock_reserve(*current_rb,
						  type, len, flags, pc);
	}
	return entry;
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 171 98.28% 12 92.31%
ingo molnar ingo molnar 3 1.72% 1 7.69%
Total 174 100.00% 13 100.00%


EXPORT_SYMBOL_GPL(trace_event_buffer_lock_reserve);



void trace_buffer_unlock_commit_regs(struct trace_array *tr,
				     struct ring_buffer *buffer,
				     struct ring_buffer_event *event,
				     unsigned long flags, int pc,
				     struct pt_regs *regs)
{
	__buffer_unlock_commit(buffer, event);

	ftrace_trace_stack(tr, buffer, flags, 0, pc, regs);
	ftrace_trace_userstack(buffer, flags, pc);
}

Contributors
Person Tokens Prop Commits CommitProp
masami hiramatsu masami hiramatsu 43 68.25% 1 12.50%
steven rostedt steven rostedt 20 31.75% 7 87.50%
Total 63 100.00% 8 100.00%


void

trace_function(struct trace_array *tr,
	       unsigned long ip, unsigned long parent_ip, unsigned long flags,
	       int pc)
{
	struct trace_event_call *call = &event_function;
	struct ring_buffer *buffer = tr->trace_buffer.buffer;
	struct ring_buffer_event *event;
	struct ftrace_entry *entry;

	event = trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry),
					  flags, pc);
	if (!event)
		return;
	entry	= ring_buffer_event_data(event);
	entry->ip			= ip;
	entry->parent_ip		= parent_ip;

	if (!call_filter_check_discard(call, entry, buffer, event))
		__buffer_unlock_commit(buffer, event);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 80 67.23% 11 57.89%
tom zanussi tom zanussi 17 14.29% 3 15.79%
ingo molnar ingo molnar 13 10.92% 3 15.79%
arnaldo carvalho de melo arnaldo carvalho de melo 7 5.88% 1 5.26%
torok edwin torok edwin 2 1.68% 1 5.26%
Total 119 100.00% 19 100.00%

#ifdef CONFIG_STACKTRACE


#define FTRACE_STACK_MAX_ENTRIES (PAGE_SIZE / sizeof(unsigned long))

struct ftrace_stack {
	
unsigned long		calls[FTRACE_STACK_MAX_ENTRIES];
};

static DEFINE_PER_CPU(struct ftrace_stack, ftrace_stack);
static DEFINE_PER_CPU(int, ftrace_stack_reserve);



static void __ftrace_trace_stack(struct ring_buffer *buffer,
				 unsigned long flags,
				 int skip, int pc, struct pt_regs *regs)
{
	struct trace_event_call *call = &event_kernel_stack;
	struct ring_buffer_event *event;
	struct stack_entry *entry;
	struct stack_trace trace;
	int use_stack;
	int size = FTRACE_STACK_ENTRIES;

	trace.nr_entries	= 0;
	trace.skip		= skip;

	/*
         * Since events can happen in NMIs there's no safe way to
         * use the per cpu ftrace_stacks. We reserve it and if an interrupt
         * or NMI comes in, it will just have to use the default
         * FTRACE_STACK_SIZE.
         */
	preempt_disable_notrace();

	use_stack = __this_cpu_inc_return(ftrace_stack_reserve);
	/*
         * We don't need any atomic variables, just a barrier.
         * If an interrupt comes in, we don't care, because it would
         * have exited and put the counter back to what we want.
         * We just need a barrier to keep gcc from moving things
         * around.
         */
	barrier();
	if (use_stack == 1) {
		trace.entries		= this_cpu_ptr(ftrace_stack.calls);
		trace.max_entries	= FTRACE_STACK_MAX_ENTRIES;

		if (regs)
			save_stack_trace_regs(regs, &trace);
		else
			save_stack_trace(&trace);

		if (trace.nr_entries > size)
			size = trace.nr_entries;
	} else
		/* From now on, use_stack is a boolean */
		use_stack = 0;

	size *= sizeof(unsigned long);

	event = trace_buffer_lock_reserve(buffer, TRACE_STACK,
					  sizeof(*entry) + size, flags, pc);
	if (!event)
		goto out;
	entry = ring_buffer_event_data(event);

	memset(&entry->caller, 0, size);

	if (use_stack)
		memcpy(&entry->caller, trace.entries,
		       trace.nr_entries * sizeof(unsigned long));
	else {
		trace.max_entries	= FTRACE_STACK_ENTRIES;
		trace.entries		= entry->caller;
		if (regs)
			save_stack_trace_regs(regs, &trace);
		else
			save_stack_trace(&trace);
	}

	entry->size = trace.nr_entries;

	if (!call_filter_check_discard(call, entry, buffer, event))
		__buffer_unlock_commit(buffer, event);

 out:
	/* Again, don't let gcc optimize things here */
	barrier();
	__this_cpu_dec(ftrace_stack_reserve);
	preempt_enable_notrace();

}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 181 58.77% 15 57.69%
frederic weisbecker frederic weisbecker 75 24.35% 1 3.85%
tom zanussi tom zanussi 21 6.82% 3 11.54%
masami hiramatsu masami hiramatsu 16 5.19% 1 3.85%
ingo molnar ingo molnar 7 2.27% 1 3.85%
christoph lameter christoph lameter 2 0.65% 1 3.85%
peter zijlstra peter zijlstra 2 0.65% 1 3.85%
shan wei shan wei 2 0.65% 1 3.85%
arnaldo carvalho de melo arnaldo carvalho de melo 1 0.32% 1 3.85%
thomas gleixner thomas gleixner 1 0.32% 1 3.85%
Total 308 100.00% 26 100.00%



static inline void ftrace_trace_stack(struct trace_array *tr,
				      struct ring_buffer *buffer,
				      unsigned long flags,
				      int skip, int pc, struct pt_regs *regs)
{
	if (!(tr->trace_flags & TRACE_ITER_STACKTRACE))
		return;

	__ftrace_trace_stack(buffer, flags, skip, pc, regs);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 56 98.25% 6 85.71%
masami hiramatsu masami hiramatsu 1 1.75% 1 14.29%
Total 57 100.00% 7 100.00%



void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
		   int pc)
{
	__ftrace_trace_stack(tr->trace_buffer.buffer, flags, skip, pc, NULL);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 20 54.05% 6 50.00%
frederic weisbecker frederic weisbecker 7 18.92% 1 8.33%
torok edwin torok edwin 5 13.51% 1 8.33%
ingo molnar ingo molnar 3 8.11% 3 25.00%
masami hiramatsu masami hiramatsu 2 5.41% 1 8.33%
Total 37 100.00% 12 100.00%

/**
 * trace_dump_stack - record a stack back trace in the trace buffer
 * @skip: Number of functions to skip (helper handlers)
 */


void trace_dump_stack(int skip)
{
	unsigned long flags;

	if (tracing_disabled || tracing_selftest_running)
		return;

	local_save_flags(flags);

	/*
         * Skip 3 more, seems to get us at the caller of
         * this function.
         */
	skip += 3;
	__ftrace_trace_stack(global_trace.trace_buffer.buffer,
			     flags, skip, preempt_count(), NULL);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 29 61.70% 5 62.50%
frederic weisbecker frederic weisbecker 11 23.40% 1 12.50%
carsten emde carsten emde 5 10.64% 1 12.50%
masami hiramatsu masami hiramatsu 2 4.26% 1 12.50%
Total 47 100.00% 8 100.00%

static DEFINE_PER_CPU(int, user_stack_count);


void

ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
{
	struct trace_event_call *call = &event_user_stack;
	struct ring_buffer_event *event;
	struct userstack_entry *entry;
	struct stack_trace trace;

	if (!(global_trace.trace_flags & TRACE_ITER_USERSTACKTRACE))
		return;

	/*
         * NMIs can not handle page faults, even with fix ups.
         * The save user stack can (and often does) fault.
         */
	if (unlikely(in_nmi()))
		return;

	/*
         * prevent recursion, since the user stack tracing may
         * trigger other kernel events.
         */
	preempt_disable();
	if (__this_cpu_read(user_stack_count))
		goto out;

	__this_cpu_inc(user_stack_count);

	event = trace_buffer_lock_reserve(buffer, TRACE_USER_STACK,
					  sizeof(*entry), flags, pc);
	if (!event)
		goto out_drop_count;
	entry	= ring_buffer_event_data(event);

	entry->tgid		= current->tgid;
	memset(&entry->caller, 0, sizeof(entry->caller));

	trace.nr_entries	= 0;
	trace.max_entries	= FTRACE_STACK_ENTRIES;
	trace.skip		= 0;
	trace.entries		= entry->caller;

	save_stack_trace_user(&trace);
	if (!call_filter_check_discard(call, entry, buffer, event))
		__buffer_unlock_commit(buffer, event);

 out_drop_count:
	__this_cpu_dec(user_stack_count);
 out:
	preempt_enable();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 121 59.31% 16 69.57%
frederic weisbecker frederic weisbecker 52 25.49% 1 4.35%
tom zanussi tom zanussi 21 10.29% 3 13.04%
ingo molnar ingo molnar 6 2.94% 1 4.35%
li zefan li zefan 3 1.47% 1 4.35%
arnaldo carvalho de melo arnaldo carvalho de melo 1 0.49% 1 4.35%
Total 204 100.00% 23 100.00%

#ifdef UNUSED


static void __trace_userstack(struct trace_array *tr, unsigned long flags)
{
	ftrace_trace_userstack(tr, flags, preempt_count());
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 22 88.00% 5 71.43%
ingo molnar ingo molnar 2 8.00% 1 14.29%
hannes eder hannes eder 1 4.00% 1 14.29%
Total 25 100.00% 7 100.00%

#endif /* UNUSED */

#endif /* CONFIG_STACKTRACE */

/* created for use with alloc_percpu */

struct trace_buffer_struct {
	
char buffer[TRACE_BUF_SIZE];
};


static struct trace_buffer_struct *trace_percpu_buffer;

static struct trace_buffer_struct *trace_percpu_sirq_buffer;

static struct trace_buffer_struct *trace_percpu_irq_buffer;

static struct trace_buffer_struct *trace_percpu_nmi_buffer;

/*
 * The buffer used is dependent on the context. There is a per cpu
 * buffer for normal context, softirq contex, hard irq context and
 * for NMI context. Thise allows for lockless recording.
 *
 * Note, if the buffers failed to be allocated, then this returns NULL
 */


static char *get_trace_buf(void)
{
	struct trace_buffer_struct *percpu_buffer;

	/*
         * If we have allocated per cpu buffers, then we do not
         * need to do any locking.
         */
	if (in_nmi())
		percpu_buffer = trace_percpu_nmi_buffer;
	else if (in_irq())
		percpu_buffer = trace_percpu_irq_buffer;
	else if (in_softirq())
		percpu_buffer = trace_percpu_sirq_buffer;
	else
		percpu_buffer = trace_percpu_buffer;

	if (!percpu_buffer)
		return NULL;

	return this_cpu_ptr(&percpu_buffer->buffer[0]);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 47 68.12% 3 50.00%
frederic weisbecker frederic weisbecker 13 18.84% 1 16.67%
shan wei shan wei 7 10.14% 1 16.67%
thomas gleixner thomas gleixner 2 2.90% 1 16.67%
Total 69 100.00% 6 100.00%



static int alloc_percpu_trace_buffer(void)
{
	struct trace_buffer_struct *buffers;
	struct trace_buffer_struct *sirq_buffers;
	struct trace_buffer_struct *irq_buffers;
	struct trace_buffer_struct *nmi_buffers;

	buffers = alloc_percpu(struct trace_buffer_struct);
	if (!buffers)
		goto err_warn;

	sirq_buffers = alloc_percpu(struct trace_buffer_struct);
	if (!sirq_buffers)
		goto err_sirq;

	irq_buffers = alloc_percpu(struct trace_buffer_struct);
	if (!irq_buffers)
		goto err_irq;

	nmi_buffers = alloc_percpu(struct trace_buffer_struct);
	if (!nmi_buffers)
		goto err_nmi;

	trace_percpu_buffer = buffers;
	trace_percpu_sirq_buffer = sirq_buffers;
	trace_percpu_irq_buffer = irq_buffers;
	trace_percpu_nmi_buffer = nmi_buffers;

	return 0;

 err_nmi:
	free_percpu(irq_buffers);
 err_irq:
	free_percpu(sirq_buffers);
 err_sirq:
	free_percpu(buffers);
 err_warn:
	WARN(1, "Could not allocate percpu trace_printk buffer");
	return -ENOMEM;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 134 92.41% 8 88.89%
frederic weisbecker frederic weisbecker 11 7.59% 1 11.11%
Total 145 100.00% 9 100.00%


static int buffers_allocated;



void trace_printk_init_buffers(void)
{
	if (buffers_allocated)
		return;

	if (alloc_percpu_trace_buffer())
		return;

	/* trace_printk() is for debug use only. Don't use it in production. */

	pr_warn("\n");
	pr_warn("**********************************************************\n");
	pr_warn("**   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **\n");
	pr_warn("**                                                      **\n");
	pr_warn("** trace_printk() being used. Allocating extra memory.  **\n");
	pr_warn("**                                                      **\n");
	pr_warn("** This means that this is a DEBUG kernel and it is     **\n");
	pr_warn("** unsafe for production use.                           **\n");
	pr_warn("**                                                      **\n");
	pr_warn("** If you see this message and you are not debugging    **\n");
	pr_warn("** the kernel, report this immediately to your vendor!  **\n");
	pr_warn("**                                                      **\n");
	pr_warn("**   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **\n");
	pr_warn("**********************************************************\n");

	/* Expand the buffers to set size */
	tracing_update_buffers();

	buffers_allocated = 1;

	/*
         * trace_printk_init_buffers() can be called by modules.
         * If that happens, then we need to start cmdline recording
         * directly here. If the global_trace.buffer is already
         * allocated here, then this was called by module code.
         */
	if (global_trace.trace_buffer.buffer)
		tracing_start_cmdline_record();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 89 81.65% 9 75.00%
joe perches joe perches 14 12.84% 1 8.33%
borislav petkov borislav petkov 5 4.59% 1 8.33%
frans klaver frans klaver 1 0.92% 1 8.33%
Total 109 100.00% 12 100.00%



void trace_printk_start_comm(void)
{
	/* Start tracing comms if trace printk is set */
	if (!buffers_allocated)
		return;
	tracing_start_cmdline_record();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 17 100.00% 5 100.00%
Total 17 100.00% 5 100.00%



static void trace_printk_start_stop_comm(int enabled)
{
	if (!buffers_allocated)
		return;

	if (enabled)
		tracing_start_cmdline_record();
	else
		tracing_stop_cmdline_record();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 26 100.00% 3 100.00%
Total 26 100.00% 3 100.00%

/**
 * trace_vbprintk - write binary msg to tracing buffer
 *
 */


int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
{
	struct trace_event_call *call = &event_bprint;
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	struct trace_array *tr = &global_trace;
	struct bprint_entry *entry;
	unsigned long flags;
	char *tbuffer;
	int len = 0, size, pc;

	if (unlikely(tracing_selftest_running || tracing_disabled))
		return 0;

	/* Don't pollute graph traces with trace_vprintk internals */
	pause_graph_tracing();

	pc = preempt_count();
	preempt_disable_notrace();

	tbuffer = get_trace_buf();
	if (!tbuffer) {
		len = 0;
		goto out;
	}

	len = vbin_printf((u32 *)tbuffer, TRACE_BUF_SIZE/sizeof(int), fmt, args);

	if (len > TRACE_BUF_SIZE/sizeof(int) || len < 0)
		goto out;

	local_save_flags(flags);
	size = sizeof(*entry) + sizeof(u32) * len;
	buffer = tr->trace_buffer.buffer;
	event = trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size,
					  flags, pc);
	if (!event)
		goto out;
	entry = ring_buffer_event_data(event);
	entry->ip			= ip;
	entry->fmt			= fmt;

	memcpy(entry->buf, tbuffer, sizeof(u32) * len);
	if (!call_filter_check_discard(call, entry, buffer, event)) {
		__buffer_unlock_commit(buffer, event);
		ftrace_trace_stack(tr, buffer, flags, 6, pc, NULL);
	}

out:
	preempt_enable_notrace();
	unpause_graph_tracing();

	return len;
}
Contributors
Person Tokens Prop Commits CommitProp
frederic weisbecker frederic weisbecker 129 45.58% 2 8.00%
steven rostedt steven rostedt 125 44.17% 17 68.00%
tom zanussi tom zanussi 15 5.30% 3 12.00%
torok edwin torok edwin 13 4.59% 2 8.00%
pekka paalanen pekka paalanen 1 0.35% 1 4.00%
Total 283 100.00% 25 100.00%


EXPORT_SYMBOL_GPL(trace_vbprintk);


static int

__trace_array_vprintk(struct ring_buffer *buffer,
		      unsigned long ip, const char *fmt, va_list args)
{
	struct trace_event_call *call = &event_print;
	struct ring_buffer_event *event;
	int len = 0, size, pc;
	struct print_entry *entry;
	unsigned long flags;
	char *tbuffer;

	if (tracing_disabled || tracing_selftest_running)
		return 0;

	/* Don't pollute graph traces with trace_vprintk internals */
	pause_graph_tracing();

	pc = preempt_count();
	preempt_disable_notrace();


	tbuffer = get_trace_buf();
	if (!tbuffer) {
		len = 0;
		goto out;
	}

	len = vscnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args);

	local_save_flags(flags);
	size = sizeof(*entry) + len + 1;
	event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
					  flags, pc);
	if (!event)
		goto out;
	entry = ring_buffer_event_data(event);
	entry->ip = ip;

	memcpy(&entry->buf, tbuffer, len + 1);
	if (!call_filter_check_discard(call, entry, buffer, event)) {
		__buffer_unlock_commit(buffer, event);
		ftrace_trace_stack(&global_trace, buffer, flags, 6, pc, NULL);
	}
 out:
	preempt_enable_notrace();
	unpause_graph_tracing();

	return len;
}

Contributors
Person Tokens Prop Commits CommitProp
frederic weisbecker frederic weisbecker 101 44.30% 3 10.00%
steven rostedt steven rostedt 89 39.04% 17 56.67%
tom zanussi tom zanussi 16 7.02% 3 10.00%
carsten emde carsten emde 8 3.51% 1 3.33%
torok edwin torok edwin 7 3.07% 2 6.67%
dan carpenter dan carpenter 3 1.32% 1 3.33%
lai jiangshan lai jiangshan 3 1.32% 2 6.67%
ingo molnar ingo molnar 1 0.44% 1 3.33%
Total 228 100.00% 30 100.00%



int trace_array_vprintk(struct trace_array *tr,
			unsigned long ip, const char *fmt, va_list args)
{
	return __trace_array_vprintk(tr->trace_buffer.buffer, ip, fmt, args);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 35 92.11% 3 75.00%
lai jiangshan lai jiangshan 3 7.89% 1 25.00%
Total 38 100.00% 4 100.00%



int trace_array_printk(struct trace_array *tr,
		       unsigned long ip, const char *fmt, ...)
{
	int ret;
	va_list ap;

	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
		return 0;

	va_start(ap, fmt);
	ret = trace_array_vprintk(tr, ip, fmt, ap);
	va_end(ap);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 69 100.00% 3 100.00%
Total 69 100.00% 3 100.00%



int trace_array_printk_buf(struct ring_buffer *buffer,
			   unsigned long ip, const char *fmt, ...)
{
	int ret;
	va_list ap;

	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
		return 0;

	va_start(ap, fmt);
	ret = __trace_array_vprintk(buffer, ip, fmt, ap);
	va_end(ap);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 69 100.00% 4 100.00%
Total 69 100.00% 4 100.00%



int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
{
	return trace_array_vprintk(&global_trace, ip, fmt, args);
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 30 100.00% 3 100.00%
Total 30 100.00% 3 100.00%


EXPORT_SYMBOL_GPL(trace_vprintk);



static void trace_iterator_increment(struct trace_iterator *iter)
{
	struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, iter->cpu);

	iter->idx++;
	if (buf_iter)
		ring_buffer_read(buf_iter, NULL);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 28 68.29% 3 60.00%
frederic weisbecker frederic weisbecker 12 29.27% 1 20.00%
ingo molnar ingo molnar 1 2.44% 1 20.00%
Total 41 100.00% 5 100.00%


static struct trace_entry *

peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts,
		unsigned long *lost_events)
{
	struct ring_buffer_event *event;
	struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, cpu);

	if (buf_iter)
		event = ring_buffer_iter_peek(buf_iter, ts);
	else
		event = ring_buffer_peek(iter->trace_buffer->buffer, cpu, ts,
					 lost_events);

	if (event) {
		iter->ent_size = ring_buffer_event_length(event);
		return ring_buffer_event_data(event);
	}
	iter->ent_size = 0;
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 55 53.40% 6 75.00%
frederic weisbecker frederic weisbecker 47 45.63% 1 12.50%
thomas gleixner thomas gleixner 1 0.97% 1 12.50%
Total 103 100.00% 8 100.00%


static struct trace_entry *

__find_next_entry(struct trace_iterator *iter, int *ent_cpu,
		  unsigned long *missing_events, u64 *ent_ts)
{
	struct ring_buffer *buffer = iter->trace_buffer->buffer;
	struct trace_entry *ent, *next = NULL;
	unsigned long lost_events = 0, next_lost = 0;
	int cpu_file = iter->cpu_file;
	u64 next_ts = 0, ts;
	int next_cpu = -1;
	int next_size = 0;
	int cpu;

	/*
         * If we are in a per_cpu trace file, don't bother by iterating over
         * all cpu and peek directly.
         */
	if (cpu_file > RING_BUFFER_ALL_CPUS) {
		if (ring_buffer_empty_cpu(buffer, cpu_file))
			return NULL;
		ent = peek_next_entry(iter, cpu_file, ent_ts, missing_events);
		if (ent_cpu)
			*ent_cpu = cpu_file;

		return ent;
	}

	for_each_tracing_cpu(cpu) {

		if (ring_buffer_empty_cpu(buffer, cpu))
			continue;

		ent = peek_next_entry(iter, cpu, &ts, &lost_events);

		/*
                 * Pick the entry with the smallest timestamp:
                 */
		if (ent && (!next || ts < next_ts)) {
			next = ent;
			next_cpu = cpu;
			next_ts = ts;
			next_lost = lost_events;
			next_size = iter->ent_size;
		}
	}

	iter->ent_size = next_size;

	if (ent_cpu)
		*ent_cpu = next_cpu;

	if (ent_ts)
		*ent_ts = next_ts;

	if (missing_events)
		*missing_events = next_lost;

	return next;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 182 77.12% 15 68.18%
frederic weisbecker frederic weisbecker 40 16.95% 1 4.55%
ingo molnar ingo molnar 7 2.97% 2 9.09%
torok edwin torok edwin 3 1.27% 1 4.55%
lai jiangshan lai jiangshan 2 0.85% 1 4.55%
pekka paalanen pekka paalanen 1 0.42% 1 4.55%
eric w. biederman eric w. biederman 1 0.42% 1 4.55%
Total 236 100.00% 22 100.00%

/* Find the next real entry, without updating the iterator itself */


struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
					  int *ent_cpu, u64 *ent_ts)
{
	return __find_next_entry(iter, ent_cpu, NULL, ent_ts);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 31 96.88% 5 83.33%
frederic weisbecker frederic weisbecker 1 3.12% 1 16.67%
Total 32 100.00% 6 100.00%

/* Find the next real entry, and increment the iterator to the next entry */


void *trace_find_next_entry_inc(struct trace_iterator *iter)
{
	iter->ent = __find_next_entry(iter, &iter->cpu,
				      &iter->lost_events, &iter->ts);

	if (iter->ent)
		trace_iterator_increment(iter);

	return iter->ent ? iter : NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 51 92.73% 11 73.33%
pekka paalanen pekka paalanen 1 1.82% 1 6.67%
peter zijlstra peter zijlstra 1 1.82% 1 6.67%
jason wessel jason wessel 1 1.82% 1 6.67%
ingo molnar ingo molnar 1 1.82% 1 6.67%
Total 55 100.00% 15 100.00%



static void trace_consume(struct trace_iterator *iter)
{
	ring_buffer_consume(iter->trace_buffer->buffer, iter->cpu, &iter->ts,
			    &iter->lost_events);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 28 82.35% 7 77.78%
ingo molnar ingo molnar 4 11.76% 1 11.11%
frederic weisbecker frederic weisbecker 2 5.88% 1 11.11%
Total 34 100.00% 9 100.00%



static void *s_next(struct seq_file *m, void *v, loff_t *pos)
{
	struct trace_iterator *iter = m->private;
	int i = (int)*pos;
	void *ent;

	WARN_ON_ONCE(iter->leftover);

	(*pos)++;

	/* can't go backwards */
	if (iter->idx > i)
		return NULL;

	if (iter->idx < 0)
		ent = trace_find_next_entry_inc(iter);
	else
		ent = iter;

	while (ent && iter->idx < i)
		ent = trace_find_next_entry_inc(iter);

	iter->pos = *pos;

	return ent;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 84 73.68% 12 54.55%
torok edwin torok edwin 12 10.53% 2 9.09%
ingo molnar ingo molnar 11 9.65% 3 13.64%
arnaldo carvalho de melo arnaldo carvalho de melo 3 2.63% 2 9.09%
jason wessel jason wessel 2 1.75% 1 4.55%
frederic weisbecker frederic weisbecker 1 0.88% 1 4.55%
pekka paalanen pekka paalanen 1 0.88% 1 4.55%
Total 114 100.00% 22 100.00%



void tracing_iter_reset(struct trace_iterator *iter, int cpu)
{
	struct ring_buffer_event *event;
	struct ring_buffer_iter *buf_iter;
	unsigned long entries = 0;
	u64 ts;

	per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = 0;

	buf_iter = trace_buffer_iter(iter, cpu);
	if (!buf_iter)
		return;

	ring_buffer_iter_reset(buf_iter);

	/*
         * We could have the case with the max latency tracers
         * that a reset never took place on a cpu. This is evident
         * by the timestamp being before the start of the buffer.
         */
	while ((event = ring_buffer_iter_peek(buf_iter, &ts))) {
		if (ts >= iter->trace_buffer->time_start)
			break;
		entries++;
		ring_buffer_read(buf_iter, NULL);
	}

	per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = entries;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 92 76.67% 7 70.00%
ingo molnar ingo molnar 26 21.67% 1 10.00%
arnaldo carvalho de melo arnaldo carvalho de melo 2 1.67% 2 20.00%
Total 120 100.00% 10 100.00%

/*
 * The current tracer is copied to avoid a global locking
 * all around.
 */


static void *s_start(struct seq_file *m, loff_t *pos)
{
	struct trace_iterator *iter = m->private;
	struct trace_array *tr = iter->tr;
	int cpu_file = iter->cpu_file;
	void *p = NULL;
	loff_t l = 0;
	int cpu;

	/*
         * copy the tracer to avoid using a global lock all around.
         * iter->trace is a copy of current_trace, the pointer to the
         * name may be used instead of a strcmp(), as iter->trace->name
         * will point to the same string as current_trace->name.
         */
	mutex_lock(&trace_types_lock);
	if (unlikely(tr->current_trace && iter->trace->name != tr->current_trace->name))
		*iter->trace = *tr->current_trace;
	mutex_unlock(&trace_types_lock);

#ifdef CONFIG_TRACER_MAX_TRACE
	if (iter->snapshot && iter->trace->use_max_tr)
		return ERR_PTR(-EBUSY);
#endif

	if (!iter->snapshot)
		atomic_inc(&trace_record_cmdline_disabled);

	if (*pos != iter->pos) {
		iter->ent = NULL;
		iter->cpu = 0;
		iter->idx = -1;

		if (cpu_file == RING_BUFFER_ALL_CPUS) {
			for_each_tracing_cpu(cpu)
				tracing_iter_reset(iter, cpu);
		} else
			tracing_iter_reset(iter, cpu_file);

		iter->leftover = 0;
		for (p = iter; p && l < *pos; p = s_next(m, p, &l))
			;

	} else {
		/*
                 * If we overflowed the seq_file before, then we want
                 * to just reuse the trace_seq buffer again.
                 */
		if (iter->leftover)
			p = iter;
		else {
			l = *pos - 1;
			p = s_next(m, p, &l);
		}
	}

	trace_event_read_lock();
	trace_access_lock(cpu_file);
	return p;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 159 58.46% 16 45.71%
ingo molnar ingo molnar 35 12.87% 5 14.29%
frederic weisbecker frederic weisbecker 24 8.82% 3 8.57%
hiraku toyooka hiraku toyooka 24 8.82% 2 5.71%
lai jiangshan lai jiangshan 11 4.04% 3 8.57%
torok edwin torok edwin 9 3.31% 2 5.71%
peter zijlstra peter zijlstra 6 2.21% 2 5.71%
arnaldo carvalho de melo arnaldo carvalho de melo 4 1.47% 2 5.71%
Total 272 100.00% 35 100.00%



static void s_stop(struct seq_file *m, void *p)
{
	struct trace_iterator *iter = m->private;

#ifdef CONFIG_TRACER_MAX_TRACE
	if (iter->snapshot && iter->trace->use_max_tr)
		return;
#endif

	if (!iter->snapshot)
		atomic_dec(&trace_record_cmdline_disabled);

	trace_access_unlock(iter->cpu_file);
	trace_event_read_unlock();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 43 66.15% 5 62.50%
lai jiangshan lai jiangshan 12 18.46% 2 25.00%
hiraku toyooka hiraku toyooka 10 15.38% 1 12.50%
Total 65 100.00% 8 100.00%


static void

get_total_entries(struct trace_buffer *buf,
		  unsigned long *total, unsigned long *entries)
{
	unsigned long count;
	int cpu;

	*total = 0;
	*entries = 0;

	for_each_tracing_cpu(cpu) {
		count = ring_buffer_entries_cpu(buf->buffer, cpu);
		/*
                 * If this buffer has skipped entries, then we hold all
                 * entries for the trace and we need to ignore the
                 * ones before the time stamp.
                 */
		if (per_cpu_ptr(buf->data, cpu)->skipped_entries) {
			count -= per_cpu_ptr(buf->data, cpu)->skipped_entries;
			/* total is the same as the entries */
			*total += count;
		} else
			*total += count +
				ring_buffer_overrun_cpu(buf->buffer, cpu);
		*entries += count;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 109 99.09% 8 88.89%
ingo molnar ingo molnar 1 0.91% 1 11.11%
Total 110 100.00% 9 100.00%



static void print_lat_help_header(struct seq_file *m)
{
	seq_puts(m, "#                  _------=> CPU#            \n"
		    "#                 / _-----=> irqs-off        \n"
		    "#                | / _----=> need-resched    \n"
		    "#                || / _---=> hardirq/softirq \n"
		    "#                ||| / _--=> preempt-depth   \n"
		    "#                |||| /     delay            \n"
		    "#  cmd     pid   ||||| time  |   caller      \n"
		    "#     \\   /      |||||  \\    |   /         \n");
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 10 40.00% 3 42.86%
ingo molnar ingo molnar 8 32.00% 2 28.57%
michael ellerman michael ellerman 5 20.00% 1 14.29%
rasmus villemoes rasmus villemoes 2 8.00% 1 14.29%
Total 25 100.00% 7 100.00%



static void print_event_info(struct trace_buffer *buf, struct seq_file *m)
{
	unsigned long total;
	unsigned long entries;

	get_total_entries(buf, &total, &entries);
	seq_printf(m, "# entries-in-buffer/entries-written: %lu/%lu   #P:%d\n",
		   entries, total, num_online_cpus());
	seq_puts(m, "#\n");
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 35 62.50% 2 66.67%
jiri olsa jiri olsa 21 37.50% 1 33.33%
Total 56 100.00% 3 100.00%



static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m)
{
	print_event_info(buf, m);
	seq_puts(m, "#           TASK-PID   CPU#      TIMESTAMP  FUNCTION\n"
		    "#              | |       |          |         |\n");
}

Contributors
Person Tokens Prop Commits CommitProp
jiri olsa jiri olsa 16 51.61% 1 16.67%
steven rostedt steven rostedt 14 45.16% 4 66.67%
michael ellerman michael ellerman 1 3.23% 1 16.67%
Total 31 100.00% 6 100.00%



static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m)
{
	print_event_info(buf, m);
	seq_puts(m, "#                              _-----=> irqs-off\n"
		    "#                             / _----=> need-resched\n"
		    "#                            | / _---=> hardirq/softirq\n"
		    "#                            || / _--=> preempt-depth\n"
		    "#                            ||| /     delay\n"
		    "#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION\n"
		    "#              | |       |   ||||       |         |\n");
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 36 100.00% 5 100.00%
Total 36 100.00% 5 100.00%


void

print_trace_header(struct seq_file *m, struct trace_iterator *iter)
{
	unsigned long sym_flags = (global_trace.trace_flags & TRACE_ITER_SYM_MASK);
	struct trace_buffer *buf = iter->trace_buffer;
	struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu);
	struct tracer *type = iter->trace;
	unsigned long entries;
	unsigned long total;
	const char *name = "preemption";

	name = type->name;

	get_total_entries(buf, &total, &entries);

	seq_printf(m, "# %s latency trace v1.1.5 on %s\n",
		   name, UTS_RELEASE);
	seq_puts(m, "# -----------------------------------"
		 "---------------------------------\n");
	seq_printf(m, "# latency: %lu us, #%lu/%lu, CPU#%d |"
		   " (M:%s VP:%d, KP:%d, SP:%d HP:%d",
		   nsecs_to_usecs(data->saved_latency),
		   entries,
		   total,
		   buf->cpu,
#if defined(CONFIG_PREEMPT_NONE)
		   "server",
#elif defined(CONFIG_PREEMPT_VOLUNTARY)
		   "desktop",
#elif defined(CONFIG_PREEMPT)
		   "preempt",
#else
		   "unknown",
#endif
		   /* These are reserved for later use */
		   0, 0, 0, 0);
#ifdef CONFIG_SMP
	seq_printf(m, " #P:%d)\n", num_online_cpus());
#else
	seq_puts(m, ")\n");
#endif
	seq_puts(m, "#    -----------------\n");
	seq_printf(m, "#    | task: %.16s-%d "
		   "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n",
		   data->comm, data->pid,
		   from_kuid_munged(seq_user_ns(m), data->uid), data->nice,
		   data->policy, data->rt_priority);
	seq_puts(m, "#    -----------------\n");

	if (data->critical_start) {
		seq_puts(m, "#  => started at: ");
		seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags);
		trace_print_seq(m, &iter->seq);
		seq_puts(m, "\n#  => ended at:   ");
		seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags);
		trace_print_seq(m, &iter->seq);
		seq_puts(m, "\n#\n");
	}

	seq_puts(m, "#\n");
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 291 86.61% 20 66.67%
ingo molnar ingo molnar 12 3.57% 3 10.00%
kosaki motohiro kosaki motohiro 9 2.68% 1 3.33%
eric w. biederman eric w. biederman 8 2.38% 1 3.33%
torok edwin torok edwin 7 2.08% 1 3.33%
markus metzger markus metzger 6 1.79% 1 3.33%
peter zijlstra peter zijlstra 2 0.60% 2 6.67%
ankita garg ankita garg 1 0.30% 1 3.33%
Total 336 100.00% 30 100.00%



static void test_cpu_buff_start(struct trace_iterator *iter)
{
	struct trace_seq *s = &iter->seq;
	struct trace_array *tr = iter->tr;

	if (!(tr->trace_flags & TRACE_ITER_ANNOTATE))
		return;

	if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
		return;

	if (iter->started && cpumask_test_cpu(iter->cpu, iter->started))
		return;

	if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries)
		return;

	if (iter->started)
		cpumask_set_cpu(iter->cpu, iter->started);

	/* Don't print started cpu buffer for the first entry of the trace */
	if (iter->idx > 1)
		trace_seq_printf(s, "##### CPU %u buffer started ####\n",
				iter->cpu);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 85 66.93% 15 65.22%
frederic weisbecker frederic weisbecker 20 15.75% 2 8.70%
sasha levin sasha levin 10 7.87% 1 4.35%
ingo molnar ingo molnar 9 7.09% 3 13.04%
dan carpenter dan carpenter 2 1.57% 1 4.35%
jiri olsa jiri olsa 1 0.79% 1 4.35%
Total 127 100.00% 23 100.00%



static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
{
	struct trace_array *tr = iter->tr;
	struct trace_seq *s = &iter->seq;
	unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK);
	struct trace_entry *entry;
	struct trace_event *event;

	entry = iter->ent;

	test_cpu_buff_start(iter);

	event = ftrace_find_event(entry->type);

	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
		if (iter->iter_flags & TRACE_FILE_LAT_FMT)
			trace_print_lat_context(iter);
		else
			trace_print_context(iter);
	}

	if (trace_seq_has_overflowed(s))
		return TRACE_TYPE_PARTIAL_LINE;

	if (event)
		return event->funcs->trace(iter, sym_flags, event);

	trace_seq_printf(s, "Unknown type %d\n", entry->type);

	return trace_handle_return(s);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 101 68.71% 14 56.00%
frederic weisbecker frederic weisbecker 23 15.65% 4 16.00%
ingo molnar ingo molnar 7 4.76% 3 12.00%
markus metzger markus metzger 5 3.40% 1 4.00%
hiraku toyooka hiraku toyooka 4 2.72% 1 4.00%
arnaldo carvalho de melo arnaldo carvalho de melo 4 2.72% 1 4.00%
david s. miller david s. miller 3 2.04% 1 4.00%
Total 147 100.00% 25 100.00%



static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
{
	struct trace_array *tr = iter->tr;
	struct trace_seq *s = &iter->seq;
	struct trace_entry *entry;
	struct trace_event *event;

	entry = iter->ent;

	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO)
		trace_seq_printf(s, "%d %d %llu ",
				 entry->pid, iter->cpu, iter->ts);

	if (trace_seq_has_overflowed(s))
		return TRACE_TYPE_PARTIAL_LINE;

	event = ftrace_find_event(entry->type);
	if (event)
		return event->funcs->raw(iter, 0, event);

	trace_seq_printf(s, "%d ?\n", entry->type);

	return trace_handle_return(s);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 66 51.56% 8 57.14%
ingo molnar ingo molnar 37 28.91% 1 7.14%
frederic weisbecker frederic weisbecker 19 14.84% 3 21.43%
david s. miller david s. miller 4 3.12% 1 7.14%
arnaldo carvalho de melo arnaldo carvalho de melo 2 1.56% 1 7.14%
Total 128 100.00% 14 100.00%



static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
{
	struct trace_array *tr = iter->tr;
	struct trace_seq *s = &iter->seq;
	unsigned char newline = '\n';
	struct trace_entry *entry;
	struct trace_event *event;

	entry = iter->ent;

	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
		SEQ_PUT_HEX_FIELD(s, entry->pid);
		SEQ_PUT_HEX_FIELD(s, iter->cpu);
		SEQ_PUT_HEX_FIELD(s, iter->ts);
		if (trace_seq_has_overflowed(s))
			return TRACE_TYPE_PARTIAL_LINE;
	}

	event = ftrace_find_event(entry->type);
	if (event) {
		enum print_line_t ret = event->funcs->hex(iter, 0, event);
		if (ret != TRACE_TYPE_HANDLED)
			return ret;
	}

	SEQ_PUT_FIELD(s, newline);

	return trace_handle_return(s);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 105 68.18% 9 45.00%
ingo molnar ingo molnar 18 11.69% 2 10.00%
frederic weisbecker frederic weisbecker 12 7.79% 2 10.00%
arnaldo carvalho de melo arnaldo carvalho de melo 11 7.14% 3 15.00%
julia lawall julia lawall 3 1.95% 1 5.00%
jiri olsa jiri olsa 3 1.95% 1 5.00%
peter zijlstra peter zijlstra 2 1.30% 2 10.00%
Total 154 100.00% 20 100.00%



static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
{
	struct trace_array *tr = iter->tr;
	struct trace_seq *s = &iter->seq;
	struct trace_entry *entry;
	struct trace_event *event;

	entry = iter->ent;

	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
		SEQ_PUT_FIELD(s, entry->pid);
		SEQ_PUT_FIELD(s, iter->cpu);
		SEQ_PUT_FIELD(s, iter->ts);
		if (trace_seq_has_overflowed(s))
			return TRACE_TYPE_PARTIAL_LINE;
	}

	event = ftrace_find_event(entry->type);
	return event ? event->funcs->binary(iter, 0, event) :
		TRACE_TYPE_HANDLED;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 77 63.64% 10 47.62%
ingo molnar ingo molnar 25 20.66% 2 9.52%
frederic weisbecker frederic weisbecker 11 9.09% 4 19.05%
arnaldo carvalho de melo arnaldo carvalho de melo 4 3.31% 2 9.52%
peter zijlstra peter zijlstra 2 1.65% 1 4.76%
hannes eder hannes eder 1 0.83% 1 4.76%
jiri olsa jiri olsa 1 0.83% 1 4.76%
Total 121 100.00% 21 100.00%



int trace_empty(struct trace_iterator *iter)
{
	struct ring_buffer_iter *buf_iter;
	int cpu;

	/* If we are looking at one CPU buffer, only check that one */
	if (iter->cpu_file != RING_BUFFER_ALL_CPUS) {
		cpu = iter->cpu_file;
		buf_iter = trace_buffer_iter(iter, cpu);
		if (buf_iter) {
			if (!ring_buffer_iter_empty(buf_iter))
				return 0;
		} else {
			if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu))
				return 0;
		}
		return 1;
	}

	for_each_tracing_cpu(cpu) {
		buf_iter = trace_buffer_iter(iter, cpu);
		if (buf_iter) {
			if (!ring_buffer_iter_empty(buf_iter))
				return 0;
		} else {
			if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu))
				return 0;
		}
	}

	return 1;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 137 98.56% 10 83.33%
frederic weisbecker frederic weisbecker 1 0.72% 1 8.33%
ingo molnar ingo molnar 1 0.72% 1 8.33%
Total 139 100.00% 12 100.00%

/*  Called with trace_event_read_lock() held. */


enum print_line_t print_trace_line(struct trace_iterator *iter)
{
	struct trace_array *tr = iter->tr;
	unsigned long trace_flags = tr->trace_flags;
	enum print_line_t ret;

	if (iter->lost_events) {
		trace_seq_printf(&iter->seq, "CPU:%d [LOST %lu EVENTS]\n",
				 iter->cpu, iter->lost_events);
		if (trace_seq_has_overflowed(&iter->seq))
			return TRACE_TYPE_PARTIAL_LINE;
	}

	if (iter->trace && iter->trace->print_line) {
		ret = iter->trace->print_line(iter);
		if (ret != TRACE_TYPE_UNHANDLED)
			return ret;
	}

	if (iter->ent->type == TRACE_BPUTS &&
			trace_flags & TRACE_ITER_PRINTK &&
			trace_flags & TRACE_ITER_PRINTK_MSGONLY)
		return trace_print_bputs_msg_only(iter);

	if (iter->ent->type == TRACE_BPRINT &&
			trace_flags & TRACE_ITER_PRINTK &&
			trace_flags & TRACE_ITER_PRINTK_MSGONLY)
		return trace_print_bprintk_msg_only(iter);

	if (iter->ent->type == TRACE_PRINT &&
			trace_flags & TRACE_ITER_PRINTK &&
			trace_flags & TRACE_ITER_PRINTK_MSGONLY)
		return trace_print_printk_msg_only(iter);

	if (trace_flags & TRACE_ITER_BIN)
		return print_bin_fmt(iter);

	if (trace_flags & TRACE_ITER_HEX)
		return print_hex_fmt(iter);

	if (trace_flags & TRACE_ITER_RAW)
		return print_raw_fmt(iter);

	return print_trace_fmt(iter);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 102 46.58% 6 42.86%
frederic weisbecker frederic weisbecker 56 25.57% 3 21.43%
ingo molnar ingo molnar 39 17.81% 3 21.43%
thomas gleixner thomas gleixner 19 8.68% 1 7.14%
jiri olsa jiri olsa 3 1.37% 1 7.14%
Total 219 100.00% 14 100.00%



void trace_latency_header(struct seq_file *m)
{
	struct trace_iterator *iter = m->private;
	struct trace_array *tr = iter->tr;

	/* print nothing if the buffers are empty */
	if (trace_empty(iter))
		return;

	if (iter->iter_flags & TRACE_FILE_LAT_FMT)
		print_trace_header(m, iter);

	if (!(tr->trace_flags & TRACE_ITER_VERBOSE))
		print_lat_help_header(m);
}

Contributors
Person Tokens Prop Commits CommitProp
jiri olsa jiri olsa 48 70.59% 1 33.33%
steven rostedt steven rostedt 20 29.41% 2 66.67%
Total 68 100.00% 3 100.00%



void trace_default_header(struct seq_file *m)
{
	struct trace_iterator *iter = m->private;
	struct trace_array *tr = iter->tr;
	unsigned long trace_flags = tr->trace_flags;

	if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
		return;

	if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
		/* print nothing if the buffers are empty */
		if (trace_empty(iter))
			return;
		print_trace_header(m, iter);
		if (!(trace_flags & TRACE_ITER_VERBOSE))
			print_lat_help_header(m);
	} else {
		if (!(trace_flags & TRACE_ITER_VERBOSE)) {
			if (trace_flags & TRACE_ITER_IRQ_INFO)
				print_func_help_header_irq(iter->trace_buffer, m);
			else
				print_func_help_header(iter->trace_buffer, m);
		}
	}
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 69 55.20% 5 71.43%
jiri olsa jiri olsa 56 44.80% 2 28.57%
Total 125 100.00% 7 100.00%



static void test_ftrace_alive(struct seq_file *m)
{
	if (!ftrace_is_dead())
		return;
	seq_puts(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n"
		    "#          MAY BE MISSING FUNCTION EVENTS\n");
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 25 96.15% 3 75.00%
rasmus villemoes rasmus villemoes 1 3.85% 1 25.00%
Total 26 100.00% 4 100.00%

#ifdef CONFIG_TRACER_MAX_TRACE


static void show_snapshot_main_help(struct seq_file *m)
{
	seq_puts(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n"
		    "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n"
		    "#                      Takes a snapshot of the main buffer.\n"
		    "# echo 2 > snapshot : Clears snapshot buffer (but does not allocate or free)\n"
		    "#                      (Doesn't have to be '2' works with any number that\n"
		    "#                       is not a '0' or '1')\n");
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 16 69.57% 3 42.86%
ingo molnar ingo molnar 3 13.04% 1 14.29%
slava pestov slava pestov 2 8.70% 1 14.29%
wang yanqing wang yanqing 1 4.35% 1 14.29%
rasmus villemoes rasmus villemoes 1 4.35% 1 14.29%
Total 23 100.00% 7 100.00%



static void show_snapshot_percpu_help(struct seq_file *m)
{
	seq_puts(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n");
#ifdef CONFIG_RING_BUFFER_ALLOW_SWAP
	seq_puts(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n"
		    "#                      Takes a snapshot of the main buffer for this cpu.\n");
#else
	seq_puts(m, "# echo 1 > snapshot : Not supported with this kernel.\n"
		    "#                     Must use main snapshot file to allocate.\n");
#endif
	seq_puts(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n"
		    "#                      (Doesn't have to be '2' works with any number that\n"
		    "#                       is not a '0' or '1')\n");
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 26 52.00% 2 25.00%
ingo molnar ingo molnar 13 26.00% 2 25.00%
rasmus villemoes rasmus villemoes 4 8.00% 1 12.50%
rusty russell rusty russell 3 6.00% 1 12.50%
li zefan li zefan 2 4.00% 1 12.50%
vaibhav nagarnaik vaibhav nagarnaik 2 4.00% 1 12.50%
Total 50 100.00% 8 100.00%



static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter)
{
	if (iter->tr->allocated_snapshot)
		seq_puts(m, "#\n# * Snapshot is allocated *\n#\n");
	else
		seq_puts(m, "#\n# * Snapshot is freed *\n#\n");

	seq_puts(m, "# Snapshot commands:\n");
	if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
		show_snapshot_main_help(m);
	else
		show_snapshot_percpu_help(m);
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 41 63.08% 2 28.57%
ingo molnar ingo molnar 10 15.38% 2 28.57%
rusty russell rusty russell 9 13.85% 1 14.29%
rasmus villemoes rasmus villemoes 3 4.62% 1 14.29%
vaibhav nagarnaik vaibhav nagarnaik 2 3.08% 1 14.29%
Total 65 100.00% 7 100.00%

#else
/* Should never be called */


static inline void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) { }
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 14 87.50% 1 50.00%
ingo molnar ingo molnar 2 12.50% 1 50.00%
Total 16 100.00% 2 100.00%

#endif



static int s_show(struct seq_file *m, void *v)
{
	struct trace_iterator *iter = v;
	int ret;

	if (iter->ent == NULL) {
		if (iter->tr) {
			seq_printf(m, "# tracer: %s\n", iter->trace->name);
			seq_puts(m, "#\n");
			test_ftrace_alive(m);
		}
		if (iter->snapshot && trace_empty(iter))
			print_snapshot_help(m, iter);
		else if (iter->trace && iter->trace->print_header)
			iter->trace->print_header(m);
		else
			trace_default_header(m);

	} else if (iter->leftover) {
		/*
                 * If we filled the seq_file buffer earlier, we
                 * want to just show it now.
                 */
		ret = trace_print_seq(m, &iter->seq);

		/* ret should this time be zero, but you never know */
		iter->leftover = ret;

	} else {
		print_trace_line(iter);
		ret = trace_print_seq(m, &iter->seq);
		/*
                 * If we overflow the seq_file buffer, then it will
                 * ask us for this data again at start up.
                 * Use that instead.
                 *  ret is 0 if seq_file write succeeded.
                 *        -1 otherwise.
                 */
		iter->leftover = ret;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 130 75.14% 6 50.00%
markus metzger markus metzger 15 8.67% 1 8.33%
frederic weisbecker frederic weisbecker 14 8.09% 1 8.33%
li zefan li zefan 11 6.36% 1 8.33%
ingo molnar ingo molnar 2 1.16% 2 16.67%
jiri olsa jiri olsa 1 0.58% 1 8.33%
Total 173 100.00% 12 100.00%

/*
 * Should be used after trace_array_get(), trace_types_lock
 * ensures that i_cdev was already initialized.
 */


static inline int tracing_get_cpu(struct inode *inode)
{
	if (inode->i_cdev) /* See trace_create_cpu_file() */
		return (long)inode->i_cdev - 1;
	return RING_BUFFER_ALL_CPUS;
}

Contributors
Person Tokens Prop Commits CommitProp
oleg nesterov oleg nesterov 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%


static const struct seq_operations tracer_seq_ops = {
	.start		= s_start,
	.next		= s_next,
	.stop		= s_stop,
	.show		= s_show,
};


static struct trace_iterator *

__tracing_open(struct inode *inode, struct file *file, bool snapshot)
{
	struct trace_array *tr = inode->i_private;
	struct trace_iterator *iter;
	int cpu;

	if (tracing_disabled)
		return ERR_PTR(-ENODEV);

	iter = __seq_open_private(file, &tracer_seq_ops, sizeof(*iter));
	if (!iter)
		return ERR_PTR(-ENOMEM);

	iter->buffer_iter = kcalloc(nr_cpu_ids, sizeof(*iter->buffer_iter),
				    GFP_KERNEL);
	if (!iter->buffer_iter)
		goto release;

	/*
         * We make a copy of the current tracer to avoid concurrent
         * changes on it while we are reading.
         */
	mutex_lock(&trace_types_lock);
	iter->trace = kzalloc(sizeof(*iter->trace), GFP_KERNEL);
	if (!iter->trace)
		goto fail;

	*iter->trace = *tr->current_trace;

	if (!zalloc_cpumask_var(&iter->started, GFP_KERNEL))
		goto fail;

	iter->tr = tr;

#ifdef CONFIG_TRACER_MAX_TRACE
	/* Currently only the top directory has a snapshot */
	if (tr->current_trace->print_max || snapshot)
		iter->trace_buffer = &tr->max_buffer;
	else
#endif
		iter->trace_buffer = &tr->trace_buffer;
	iter->snapshot = snapshot;
	iter->pos = -1;
	iter->cpu_file = tracing_get_cpu(inode);
	mutex_init(&iter->mutex);

	/* Notify the tracer early; before we stop tracing. */
	if (iter->trace && iter->trace->open)
		iter->trace->open(iter);

	/* Annotate start of buffers if we had overruns */
	if (ring_buffer_overruns(iter->trace_buffer->buffer))
		iter->iter_flags |= TRACE_FILE_ANNOTATE;

	/* Output in nanoseconds only if we are using a clock in nanoseconds. */
	if (trace_clocks[tr->clock_id].in_ns)
		iter->iter_flags |= TRACE_FILE_TIME_IN_NS;

	/* stop the trace while dumping if we are not opening "snapshot" */
	if (!iter->snapshot)
		tracing_stop_tr(tr);

	if (iter->cpu_file == RING_BUFFER_ALL_CPUS) {
		for_each_tracing_cpu(cpu) {
			iter->buffer_iter[cpu] =
				ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu);
		}
		ring_buffer_read_prepare_sync();
		for_each_tracing_cpu(cpu) {
			ring_buffer_read_start(iter->buffer_iter[cpu]);
			tracing_iter_reset(iter, cpu);
		}
	} else {
		cpu = iter->cpu_file;
		iter->buffer_iter[cpu] =
			ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu);
		ring_buffer_read_prepare_sync();
		ring_buffer_read_start(iter->buffer_iter[cpu]);
		tracing_iter_reset(iter, cpu);
	}

	mutex_unlock(&trace_types_lock);

	return iter;

 fail:
	mutex_unlock(&trace_types_lock);
	kfree(iter->trace);
	kfree(iter->buffer_iter);
release:
	seq_release_private(inode, file);
	return ERR_PTR(-ENOMEM);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 223 48.27% 17 45.95%
frederic weisbecker frederic weisbecker 102 22.08% 4 10.81%
david s. miller david s. miller 26 5.63% 1 2.70%
oleg nesterov oleg nesterov 18 3.90% 1 2.70%
hiraku toyooka hiraku toyooka 18 3.90% 1 2.70%
david sharp david sharp 17 3.68% 2 5.41%
markus metzger markus metzger 16 3.46% 1 2.70%
jiri olsa jiri olsa 13 2.81% 1 2.70%
dan carpenter dan carpenter 8 1.73% 1 2.70%
li zefan li zefan 8 1.73% 3 8.11%
julia lawall julia lawall 5 1.08% 1 2.70%
gil fruchter gil fruchter 3 0.65% 2 5.41%
yoshihiro yunomae yoshihiro yunomae 3 0.65% 1 2.70%
ingo molnar ingo molnar 2 0.43% 1 2.70%
Total 462 100.00% 37 100.00%



int tracing_open_generic(struct inode *inode, struct file *filp)
{
	if (tracing_disabled)
		return -ENODEV;

	filp->private_data = inode->i_private;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 29 85.29% 3 60.00%
frederic weisbecker frederic weisbecker 3 8.82% 1 20.00%
ingo molnar ingo molnar 2 5.88% 1 20.00%
Total 34 100.00% 5 100.00%



bool tracing_is_disabled(void)
{
	return (tracing_disabled) ? true: false;
}

Contributors
Person Tokens Prop Commits CommitProp
geyslan g. bem geyslan g. bem 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%

/*
 * Open and update trace_array ref count.
 * Must have the current trace_array passed to it.
 */


static int tracing_open_generic_tr(struct inode *inode, struct file *filp)
{
	struct trace_array *tr = inode->i_private;

	if (tracing_disabled)
		return -ENODEV;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	filp->private_data = inode->i_private;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 57 100.00% 2 100.00%
Total 57 100.00% 2 100.00%



static int tracing_release(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	struct seq_file *m = file->private_data;
	struct trace_iterator *iter;
	int cpu;

	if (!(file->f_mode & FMODE_READ)) {
		trace_array_put(tr);
		return 0;
	}

	/* Writes do not use seq_file */
	iter = m->private;
	mutex_lock(&trace_types_lock);

	for_each_tracing_cpu(cpu) {
		if (iter->buffer_iter[cpu])
			ring_buffer_read_finish(iter->buffer_iter[cpu]);
	}

	if (iter->trace && iter->trace->close)
		iter->trace->close(iter);

	if (!iter->snapshot)
		/* reenable tracing if it was previously enabled */
		tracing_start_tr(tr);

	__trace_array_put(tr);

	mutex_unlock(&trace_types_lock);

	mutex_destroy(&iter->mutex);
	free_cpumask_var(iter->started);
	kfree(iter->trace);
	kfree(iter->buffer_iter);
	seq_release_private(inode, file);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 136 73.51% 12 63.16%
frederic weisbecker frederic weisbecker 22 11.89% 2 10.53%
oleg nesterov oleg nesterov 10 5.41% 1 5.26%
hiraku toyooka hiraku toyooka 7 3.78% 1 5.26%
alexander z lam alexander z lam 5 2.70% 1 5.26%
jiri olsa jiri olsa 4 2.16% 1 5.26%
hannes eder hannes eder 1 0.54% 1 5.26%
Total 185 100.00% 19 100.00%



static int tracing_release_generic_tr(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;

	trace_array_put(tr);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%



static int tracing_single_release_tr(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;

	trace_array_put(tr);

	return single_release(inode, file);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%



static int tracing_open(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	struct trace_iterator *iter;
	int ret = 0;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	/* If this file was open for write, then erase contents */
	if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
		int cpu = tracing_get_cpu(inode);

		if (cpu == RING_BUFFER_ALL_CPUS)
			tracing_reset_online_cpus(&tr->trace_buffer);
		else
			tracing_reset(&tr->trace_buffer, cpu);
	}

	if (file->f_mode & FMODE_READ) {
		iter = __tracing_open(inode, file, false);
		if (IS_ERR(iter))
			ret = PTR_ERR(iter);
		else if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
			iter->iter_flags |= TRACE_FILE_LAT_FMT;
	}

	if (ret < 0)
		trace_array_put(tr);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 128 77.11% 10 71.43%
li zefan li zefan 17 10.24% 1 7.14%
ingo molnar ingo molnar 10 6.02% 1 7.14%
oleg nesterov oleg nesterov 10 6.02% 1 7.14%
hiraku toyooka hiraku toyooka 1 0.60% 1 7.14%
Total 166 100.00% 14 100.00%

/*
 * Some tracers are not suitable for instance buffers.
 * A tracer is always available for the global array (toplevel)
 * or if it explicitly states that it is.
 */

static bool

trace_ok_for_array(struct tracer *t, struct trace_array *tr)
{
	return (tr->flags & TRACE_ARRAY_FL_GLOBAL) || t->allow_instances;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 29 100.00% 1 100.00%
Total 29 100.00% 1 100.00%

/* Find the next tracer that this trace array may use */

static struct tracer *

get_tracer_for_array(struct trace_array *tr, struct tracer *t)
{
	while (t && !trace_ok_for_array(t, tr))
		t = t->next;

	return t;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 39 100.00% 1 100.00%
Total 39 100.00% 1 100.00%


static void *

t_next(struct seq_file *m, void *v, loff_t *pos)
{
	struct trace_array *tr = m->private;
	struct tracer *t = v;

	(*pos)++;

	if (t)
		t = get_tracer_for_array(tr, t->next);

	return t;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 47 78.33% 2 40.00%
avadh patel avadh patel 11 18.33% 1 20.00%
li zefan li zefan 1 1.67% 1 20.00%
ingo molnar ingo molnar 1 1.67% 1 20.00%
Total 60 100.00% 5 100.00%



static void *t_start(struct seq_file *m, loff_t *pos)
{
	struct trace_array *tr = m->private;
	struct tracer *t;
	loff_t l = 0;

	mutex_lock(&trace_types_lock);

	t = get_tracer_for_array(tr, trace_types);
	for (; t && l < *pos; t = t_next(m, t, &l))
			;

	return t;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 65 85.53% 2 50.00%
avadh patel avadh patel 9 11.84% 1 25.00%
li zefan li zefan 2 2.63% 1 25.00%
Total 76 100.00% 4 100.00%



static void t_stop(struct seq_file *m, void *p)
{
	mutex_unlock(&trace_types_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 17 80.95% 1 50.00%
avadh patel avadh patel 4 19.05% 1 50.00%
Total 21 100.00% 2 100.00%



static int t_show(struct seq_file *m, void *v)
{
	struct tracer *t = v;

	if (!t)
		return 0;

	seq_puts(m, t->name);
	if (t->next)
		seq_putc(m, ' ');
	else
		seq_putc(m, '\n');

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 49 77.78% 1 33.33%
avadh patel avadh patel 13 20.63% 1 33.33%
rasmus villemoes rasmus villemoes 1 1.59% 1 33.33%
Total 63 100.00% 3 100.00%


static const struct seq_operations show_traces_seq_ops = {
	.start		= t_start,
	.next		= t_next,
	.stop		= t_stop,
	.show		= t_show,
};



static int show_traces_open(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	struct seq_file *m;
	int ret;

	if (tracing_disabled)
		return -ENODEV;

	ret = seq_open(file, &show_traces_seq_ops);
	if (ret)
		return ret;

	m = file->private_data;
	m->private = tr;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 72 98.63% 3 75.00%
avadh patel avadh patel 1 1.37% 1 25.00%
Total 73 100.00% 4 100.00%


static ssize_t

tracing_write_stub(struct file *filp, const char __user *ubuf,
		   size_t count, loff_t *ppos)
{
	return count;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 17 62.96% 1 50.00%
arnaldo carvalho de melo arnaldo carvalho de melo 10 37.04% 1 50.00%
Total 27 100.00% 2 100.00%



loff_t tracing_lseek(struct file *file, loff_t offset, int whence)
{
	int ret;

	if (file->f_mode & FMODE_READ)
		ret = seq_lseek(file, offset, whence);
	else
		file->f_pos = ret = 0;

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 18 36.00% 1 33.33%
hiraku toyooka hiraku toyooka 17 34.00% 1 33.33%
slava pestov slava pestov 15 30.00% 1 33.33%
Total 50 100.00% 3 100.00%


static const struct file_operations tracing_fops = {
	.open		= tracing_open,
	.read		= seq_read,
	.write		= tracing_write_stub,
	.llseek		= tracing_lseek,
	.release	= tracing_release,
};


static const struct file_operations show_traces_fops = {
	.open		= show_traces_open,
	.read		= seq_read,
	.release	= seq_release,
	.llseek		= seq_lseek,
};

/*
 * The tracer itself will not take this lock, but still we want
 * to provide a consistent cpumask to user-space:
 */
static DEFINE_MUTEX(tracing_cpumask_update_lock);

/*
 * Temporary storage for the character representation of the
 * CPU bitmask (and one more byte for the newline):
 */

static char mask_str[NR_CPUS + 1];


static ssize_t

tracing_cpumask_read(struct file *filp, char __user *ubuf,
		     size_t count, loff_t *ppos)
{
	struct trace_array *tr = file_inode(filp)->i_private;
	int len;

	mutex_lock(&tracing_cpumask_update_lock);

	len = snprintf(mask_str, count, "%*pb\n",
		       cpumask_pr_args(tr->tracing_cpumask));
	if (len >= count) {
		count = -EINVAL;
		goto out_err;
	}
	count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1);

out_err:
	mutex_unlock(&tracing_cpumask_update_lock);

	return count;
}

Contributors
Person Tokens Prop Commits CommitProp
ingo molnar ingo molnar 51 48.11% 2 25.00%
steven rostedt steven rostedt 19 17.92% 2 25.00%
alexander z lam alexander z lam 14 13.21% 1 12.50%
vaibhav nagarnaik vaibhav nagarnaik 9 8.49% 1 12.50%
tejun heo tejun heo 8 7.55% 1 12.50%
kosaki motohiro kosaki motohiro 5 4.72% 1 12.50%
Total 106 100.00% 8 100.00%


static ssize_t

tracing_cpumask_write(struct file *filp, const char __user *ubuf,
		      size_t count, loff_t *ppos)
{
	struct trace_array *tr = file_inode(filp)->i_private;
	cpumask_var_t tracing_cpumask_new;
	int err, cpu;

	if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL))
		return -ENOMEM;

	err = cpumask_parse_user(ubuf, count, tracing_cpumask_new);
	if (err)
		goto err_unlock;

	mutex_lock(&tracing_cpumask_update_lock);

	local_irq_disable();
	arch_spin_lock(&tr->max_lock);
	for_each_tracing_cpu(cpu) {
		/*
                 * Increase/decrease the disabled counter if we are
                 * about to flip a bit in the cpumask:
                 */
		if (cpumask_test_cpu(cpu, tr->tracing_cpumask) &&
				!cpumask_test_cpu(cpu, tracing_cpumask_new)) {
			atomic_inc(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled);
			ring_buffer_record_disable_cpu(tr->trace_buffer.buffer, cpu);
		}
		if (!cpumask_test_cpu(cpu, tr->tracing_cpumask) &&
				cpumask_test_cpu(cpu, tracing_cpumask_new)) {
			atomic_dec(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled);
			ring_buffer_record_enable_cpu(tr->trace_buffer.buffer, cpu);
		}
	}
	arch_spin_unlock(&tr->max_lock);
	local_irq_enable();

	cpumask_copy(tr->tracing_cpumask, tracing_cpumask_new);

	mutex_unlock(&tracing_cpumask_update_lock);
	free_cpumask_var(tracing_cpumask_new);

	return count;

err_unlock:
	free_cpumask_var(tracing_cpumask_new);

	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
ingo molnar ingo molnar 103 42.39% 2 11.11%
steven rostedt steven rostedt 61 25.10% 9 50.00%
vaibhav nagarnaik vaibhav nagarnaik 40 16.46% 3 16.67%
rusty russell rusty russell 24 9.88% 1 5.56%
alexander z lam alexander z lam 10 4.12% 1 5.56%
li zefan li zefan 3 1.23% 1 5.56%
thomas gleixner thomas gleixner 2 0.82% 1 5.56%
Total 243 100.00% 18 100.00%


static const struct file_operations tracing_cpumask_fops = {
	.open		= tracing_open_generic_tr,
	.read		= tracing_cpumask_read,
	.write		= tracing_cpumask_write,
	.release	= tracing_release_generic_tr,
	.llseek		= generic_file_llseek,
};



static int tracing_trace_options_show(struct seq_file *m, void *v)
{
	struct tracer_opt *trace_opts;
	struct trace_array *tr = m->private;
	u32 tracer_flags;
	int i;

	mutex_lock(&trace_types_lock);
	tracer_flags = tr->current_trace->flags->val;
	trace_opts = tr->current_trace->flags->opts;

	for (i = 0; trace_options[i]; i++) {
		if (tr->trace_flags & (1 << i))
			seq_printf(m, "%s\n", trace_options[i]);
		else
			seq_printf(m, "no%s\n", trace_options[i]);
	}

	for (i = 0; trace_opts[i].name; i++) {
		if (tracer_flags & trace_opts[i].bit)
			seq_printf(m, "%s\n", trace_opts[i].name);
		else
			seq_printf(m, "no%s\n", trace_opts[i].name);
	}
	mutex_unlock(&trace_types_lock);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 108 59.67% 9 52.94%
frederic weisbecker frederic weisbecker 39 21.55% 2 11.76%
li zefan li zefan 14 7.73% 1 5.88%
kosaki motohiro kosaki motohiro 8 4.42% 1 5.88%
peter zijlstra peter zijlstra 5 2.76% 1 5.88%
vaibhav nagarnaik vaibhav nagarnaik 4 2.21% 1 5.88%
hiraku toyooka hiraku toyooka 2 1.10% 1 5.88%
arnaldo carvalho de melo arnaldo carvalho de melo 1 0.55% 1 5.88%
Total 181 100.00% 17 100.00%



static int __set_tracer_option(struct trace_array *tr,
			       struct tracer_flags *tracer_flags,
			       struct tracer_opt *opts, int neg)
{
	struct tracer *trace = tracer_flags->trace;
	int ret;

	ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg);
	if (ret)
		return ret;

	if (neg)
		tracer_flags->val &= ~opts->bit;
	else
		tracer_flags->val |= opts->bit;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
li zefan li zefan 38 43.18% 1 10.00%
steven rostedt steven rostedt 18 20.45% 3 30.00%
peter zijlstra peter zijlstra 16 18.18% 1 10.00%
frederic weisbecker frederic weisbecker 13 14.77% 3 30.00%
chunyu hu chunyu hu 2 2.27% 1 10.00%
zhao lei zhao lei 1 1.14% 1 10.00%
Total 88 100.00% 10 100.00%

/* Try to assign a tracer specific option */


static int set_tracer_option(struct trace_array *tr, char *cmp, int neg)
{
	struct tracer *trace = tr->current_trace;
	struct tracer_flags *tracer_flags = trace->flags;
	struct tracer_opt *opts = NULL;
	int i;

	for (i = 0; tracer_flags->opts[i].name; i++) {
		opts = &tracer_flags->opts[i];

		if (strcmp(cmp, opts->name) == 0)
			return __set_tracer_option(tr, trace->flags, opts, neg);
	}

	return -EINVAL;
}

Contributors
Person Tokens Prop Commits CommitProp
frederic weisbecker frederic weisbecker 55 51.40% 1 16.67%
steven rostedt steven rostedt 45 42.06% 3 50.00%
li zefan li zefan 4 3.74% 1 16.67%
zhao lei zhao lei 3 2.80% 1 16.67%
Total 107 100.00% 6 100.00%

/* Some tracers require overwrite to stay enabled */


int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set)
{
	if (tracer->enabled && (mask & TRACE_ITER_OVERWRITE) && !set)
		return -1;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 38 100.00% 3 100.00%
Total 38 100.00% 3 100.00%



int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
{
	/* do nothing if flag is already set */
	if (!!(tr->trace_flags & mask) == !!enabled)
		return 0;

	/* Give the tracer a chance to approve the change */
	if (tr->current_trace->flag_changed)
		if (tr->current_trace->flag_changed(tr, mask, !!enabled))
			return -EINVAL;

	if (enabled)
		tr->trace_flags |= mask;
	else
		tr->trace_flags &= ~mask;

	if (mask == TRACE_ITER_RECORD_CMD)
		trace_event_enable_cmd_record(enabled);

	if (mask == TRACE_ITER_EVENT_FORK)
		trace_event_follow_fork(tr, enabled);

	if (mask == TRACE_ITER_OVERWRITE) {
		ring_buffer_change_overwrite(tr->trace_buffer.buffer, enabled);
#ifdef CONFIG_TRACER_MAX_TRACE
		ring_buffer_change_overwrite(tr->max_buffer.buffer, enabled);
#endif
	}

	if (mask == TRACE_ITER_PRINTK) {
		trace_printk_start_stop_comm(enabled);
		trace_printk_control(enabled);
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 134 81.21% 11 68.75%
frederic weisbecker frederic weisbecker 12 7.27% 2 12.50%
li zefan li zefan 8 4.85% 1 6.25%
david sharp david sharp 7 4.24% 1 6.25%
rusty russell rusty russell 4 2.42% 1 6.25%
Total 165 100.00% 16 100.00%



static int trace_set_options(struct trace_array *tr, char *option)
{
	char *cmp;
	int neg = 0;
	int ret = -ENODEV;
	int i;
	size_t orig_len = strlen(option);

	cmp = strstrip(option);

	if (strncmp(cmp, "no", 2) == 0) {
		neg = 1;
		cmp += 2;
	}

	mutex_lock(&trace_types_lock);

	for (i = 0; trace_options[i]; i++) {
		if (strcmp(cmp, trace_options[i]) == 0) {
			ret = set_tracer_flag(tr, 1 << i, !neg);
			break;
		}
	}

	/* If no option could be set, test the specific tracer options */
	if (!trace_options[i])
		ret = set_tracer_option(tr, cmp, neg);

	mutex_unlock(&trace_types_lock);

	/*
         * If the first trailing whitespace is replaced with '\0' by strstrip,
         * turn it back into a space.
         */
	if (orig_len > strlen(option))
		option[strlen(option)] = ' ';

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 97 56.07% 10 50.00%
jiaxing wang jiaxing wang 28 16.18% 1 5.00%
frederic weisbecker frederic weisbecker 28 16.18% 3 15.00%
ingo molnar ingo molnar 8 4.62% 1 5.00%
li zefan li zefan 5 2.89% 1 5.00%
arnd bergmann arnd bergmann 3 1.73% 1 5.00%
rusty russell rusty russell 2 1.16% 1 5.00%
thomas gleixner thomas gleixner 1 0.58% 1 5.00%
david sharp david sharp 1 0.58% 1 5.00%
Total 173 100.00% 20 100.00%



static void __init apply_trace_boot_options(void)
{
	char *buf = trace_boot_options_buf;
	char *option;

	while (true) {
		option = strsep(&buf, ",");

		if (!option)
			break;

		if (*option)
			trace_set_options(&global_trace, option);

		/* Put back the comma to allow this to be called again */
		if (buf)
			*(buf - 1) = ',';
	}
}

Contributors
Person Tokens Prop Commits CommitProp
jiaxing wang jiaxing wang 68 100.00% 1 100.00%
Total 68 100.00% 1 100.00%


static ssize_t

tracing_trace_options_write(struct file *filp, const char __user *ubuf,
			size_t cnt, loff_t *ppos)
{
	struct seq_file *m = filp->private_data;
	struct trace_array *tr = m->private;
	char buf[64];
	int ret;

	if (cnt >= sizeof(buf))
		return -EINVAL;

	if (copy_from_user(buf, ubuf, cnt))
		return -EFAULT;

	buf[cnt] = 0;

	ret = trace_set_options(tr, buf);
	if (ret < 0)
		return ret;

	*ppos += cnt;

	return cnt;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 81 72.32% 6 75.00%
soeren sandmann pedersen* soeren sandmann pedersen* 29 25.89% 1 12.50%
jiri olsa jiri olsa 2 1.79% 1 12.50%
Total 112 100.00% 8 100.00%



static int tracing_trace_options_open(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	int ret;

	if (tracing_disabled)
		return -ENODEV;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	ret = single_open(file, tracing_trace_options_show, inode->i_private);
	if (ret < 0)
		trace_array_put(tr);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 25 32.89% 2 40.00%
li zefan li zefan 24 31.58% 1 20.00%
alexander z lam alexander z lam 19 25.00% 1 20.00%
frederic weisbecker frederic weisbecker 8 10.53% 1 20.00%
Total 76 100.00% 5 100.00%


static const struct file_operations tracing_iter_fops = {
	.open		= tracing_trace_options_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= tracing_single_release_tr,
	.write		= tracing_trace_options_write,
};


static const char readme_msg[] =
	"tracing mini-HOWTO:\n\n"
	"# echo 0 > tracing_on : quick way to disable tracing\n"
	"# echo 1 > tracing_on : quick way to re-enable tracing\n\n"
	" Important files:\n"
	"  trace\t\t\t- The static contents of the buffer\n"
	"\t\t\t  To clear the buffer write into this file: echo > trace\n"
	"  trace_pipe\t\t- A consuming read to see the contents of the buffer\n"
	"  current_tracer\t- function and latency tracers\n"
	"  available_tracers\t- list of configured tracers for current_tracer\n"
	"  buffer_size_kb\t- view and modify size of per cpu buffer\n"
	"  buffer_total_size_kb  - view total size of all cpu buffers\n\n"
	"  trace_clock\t\t-change the clock used to order events\n"
	"       local:   Per cpu clock but may not be synced across CPUs\n"
	"      global:   Synced across CPUs but slows tracing down.\n"
	"     counter:   Not a clock, but just an increment\n"
	"      uptime:   Jiffy counter from time of boot\n"
	"        perf:   Same clock that perf events use\n"
#ifdef CONFIG_X86_64
	"     x86-tsc:   TSC cycle counter\n"
#endif
	"\n  trace_marker\t\t- Writes into this file writes into the kernel buffer\n"
	"  tracing_cpumask\t- Limit which CPUs to trace\n"
	"  instances\t\t- Make sub-buffers with: mkdir instances/foo\n"
	"\t\t\t  Remove sub-buffer with rmdir\n"
	"  trace_options\t\t- Set format or modify how tracing happens\n"
	"\t\t\t  Disable an option by adding a suffix 'no' to the\n"
	"\t\t\t  option name\n"
	"  saved_cmdlines_size\t- echo command number in here to store comm-pid list\n"
#ifdef CONFIG_DYNAMIC_FTRACE
	"\n  available_filter_functions - list of functions that can be filtered on\n"
	"  set_ftrace_filter\t- echo function name in here to only trace these\n"
	"\t\t\t  functions\n"
	"\t     accepts: func_full_name, *func_end, func_begin*, *func_middle*\n"
	"\t     modules: Can select a group via module\n"
	"\t      Format: :mod:<module-name>\n"
	"\t     example: echo :mod:ext3 > set_ftrace_filter\n"
	"\t    triggers: a command to perform when function is hit\n"
	"\t      Format: <function>:<trigger>[:count]\n"
	"\t     trigger: traceon, traceoff\n"
	"\t\t      enable_event:<system>:<event>\n"
	"\t\t      disable_event:<system>:<event>\n"
#ifdef CONFIG_STACKTRACE
	"\t\t      stacktrace\n"
#endif
#ifdef CONFIG_TRACER_SNAPSHOT
	"\t\t      snapshot\n"
#endif
	"\t\t      dump\n"
	"\t\t      cpudump\n"
	"\t     example: echo do_fault:traceoff > set_ftrace_filter\n"
	"\t              echo do_trap:traceoff:3 > set_ftrace_filter\n"
	"\t     The first one will disable tracing every time do_fault is hit\n"
	"\t     The second will disable tracing at most 3 times when do_trap is hit\n"
	"\t       The first time do trap is hit and it disables tracing, the\n"
	"\t       counter will decrement to 2. If tracing is already disabled,\n"
	"\t       the counter will not decrement. It only decrements when the\n"
	"\t       trigger did work\n"
	"\t     To remove trigger without count:\n"
	"\t       echo '!<function>:<trigger> > set_ftrace_filter\n"
	"\t     To remove trigger with a count:\n"
	"\t       echo '!<function>:<trigger>:0 > set_ftrace_filter\n"
	"  set_ftrace_notrace\t- echo function name in here to never trace.\n"
	"\t    accepts: func_full_name, *func_end, func_begin*, *func_middle*\n"
	"\t    modules: Can select a group via module command :mod:\n"
	"\t    Does not accept triggers\n"
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_TRACER
	"  set_ftrace_pid\t- Write pid(s) to only function trace those pids\n"
	"\t\t    (function)\n"
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
	"  set_graph_function\t- Trace the nested calls of a function (function_graph)\n"
	"  set_graph_notrace\t- Do not trace the nested calls of a function (function_graph)\n"
	"  max_graph_depth\t- Trace a limited depth of nested calls (0 is unlimited)\n"
#endif
#ifdef CONFIG_TRACER_SNAPSHOT
	"\n  snapshot\t\t- Like 'trace' but shows the content of the static\n"
	"\t\t\t  snapshot buffer. Read the contents for more\n"
	"\t\t\t  information\n"
#endif
#ifdef CONFIG_STACK_TRACER
	"  stack_trace\t\t- Shows the max stack trace when active\n"
	"  stack_max_size\t- Shows current max stack size that was traced\n"
	"\t\t\t  Write into this file to reset the max size (trigger a\n"
	"\t\t\t  new trace)\n"
#ifdef CONFIG_DYNAMIC_FTRACE
	"  stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace\n"
	"\t\t\t  traces\n"
#endif
#endif /* CONFIG_STACK_TRACER */
	"  events/\t\t- Directory containing all trace event subsystems:\n"
	"      enable\t\t- Write 0/1 to enable/disable tracing of all events\n"
	"  events/<system>/\t- Directory containing all trace events for <system>:\n"
	"      enable\t\t- Write 0/1 to enable/disable tracing of all <system>\n"
	"\t\t\t  events\n"
	"      filter\t\t- If set, only events passing filter are traced\n"
	"  events/<system>/<event>/\t- Directory containing control files for\n"
	"\t\t\t  <event>:\n"
	"      enable\t\t- Write 0/1 to enable/disable tracing of <event>\n"
	"      filter\t\t- If set, only events passing filter are traced\n"
	"      trigger\t\t- If set, a command to perform when event is hit\n"
	"\t    Format: <trigger>[:count][if <filter>]\n"
	"\t   trigger: traceon, traceoff\n"
	"\t            enable_event:<system>:<event>\n"
	"\t            disable_event:<system>:<event>\n"
#ifdef CONFIG_HIST_TRIGGERS
	"\t            enable_hist:<system>:<event>\n"
	"\t            disable_hist:<system>:<event>\n"
#endif
#ifdef CONFIG_STACKTRACE
	"\t\t    stacktrace\n"
#endif
#ifdef CONFIG_TRACER_SNAPSHOT
	"\t\t    snapshot\n"
#endif
#ifdef CONFIG_HIST_TRIGGERS
	"\t\t    hist (see below)\n"
#endif
	"\t   example: echo traceoff > events/block/block_unplug/trigger\n"
	"\t            echo traceoff:3 > events/block/block_unplug/trigger\n"
	"\t            echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > \\\n"
	"\t                  events/block/block_unplug/trigger\n"
	"\t   The first disables tracing every time block_unplug is hit.\n"
	"\t   The second disables tracing the first 3 times block_unplug is hit.\n"
	"\t   The third enables the kmalloc event the first 3 times block_unplug\n"
	"\t     is hit and has value of greater than 1 for the 'nr_rq' event field.\n"
	"\t   Like function triggers, the counter is only decremented if it\n"
	"\t    enabled or disabled tracing.\n"
	"\t   To remove a trigger without a count:\n"
	"\t     echo '!<trigger> > <system>/<event>/trigger\n"
	"\t   To remove a trigger with a count:\n"
	"\t     echo '!<trigger>:0 > <system>/<event>/trigger\n"
	"\t   Filters can be ignored when removing a trigger.\n"
#ifdef CONFIG_HIST_TRIGGERS
	"      hist trigger\t- If set, event hits are aggregated into a hash table\n"
	"\t    Format: hist:keys=<field1[,field2,...]>\n"
	"\t            [:values=<field1[,field2,...]>]\n"
	"\t            [:sort=<field1[,field2,...]>]\n"
	"\t            [:size=#entries]\n"
	"\t            [:pause][:continue][:clear]\n"
	"\t            [:name=histname1]\n"
	"\t            [if <filter>]\n\n"
	"\t    When a matching event is hit, an entry is added to a hash\n"
	"\t    table using the key(s) and value(s) named, and the value of a\n"
	"\t    sum called 'hitcount' is incremented.  Keys and values\n"
	"\t    correspond to fields in the event's format description.  Keys\n"
	"\t    can be any field, or the special string 'stacktrace'.\n"
	"\t    Compound keys consisting of up to two fields can be specified\n"
	"\t    by the 'keys' keyword.  Values must correspond to numeric\n"
	"\t    fields.  Sort keys consisting of up to two fields can be\n"
	"\t    specified using the 'sort' keyword.  The sort direction can\n"
	"\t    be modified by appending '.descending' or '.ascending' to a\n"
	"\t    sort field.  The 'size' parameter can be used to specify more\n"
	"\t    or fewer than the default 2048 entries for the hashtable size.\n"
	"\t    If a hist trigger is given a name using the 'name' parameter,\n"
	"\t    its histogram data will be shared with other triggers of the\n"
	"\t    same name, and trigger hits will update this common data.\n\n"
	"\t    Reading the 'hist' file for the event will dump the hash\n"
	"\t    table in its entirety to stdout.  If there are multiple hist\n"
	"\t    triggers attached to an event, there will be a table for each\n"
	"\t    trigger in the output.  The table displayed for a named\n"
	"\t    trigger will be the same as any other instance having the\n"
	"\t    same name.  The default format used to display a given field\n"
	"\t    can be modified by appending any of the following modifiers\n"
	"\t    to the field name, as applicable:\n\n"
	"\t            .hex        display a number as a hex value\n"
	"\t            .sym        display an address as a symbol\n"
	"\t            .sym-offset display an address as a symbol and offset\n"
	"\t            .execname   display a common_pid as a program name\n"
	"\t            .syscall    display a syscall id as a syscall name\n\n"
	"\t            .log2       display log2 value rather than raw number\n\n"
	"\t    The 'pause' parameter can be used to pause an existing hist\n"
	"\t    trigger or to start a hist trigger but not log any events\n"
	"\t    until told to do so.  'continue' can be used to start or\n"
	"\t    restart a paused hist trigger.\n\n"
	"\t    The 'clear' parameter will clear the contents of a running\n"
	"\t    hist trigger and leave its current paused/active state\n"
	"\t    unchanged.\n\n"
	"\t    The enable_hist and disable_hist triggers can be used to\n"
	"\t    have one event conditionally start and stop another event's\n"
	"\t    already-attached hist trigger.  The syntax is analagous to\n"
	"\t    the enable_event and disable_event triggers.\n"
#endif
;


static ssize_t

tracing_readme_read(struct file *filp, char __user *ubuf,
		       size_t cnt, loff_t *ppos)
{
	return simple_read_from_buffer(ubuf, cnt, ppos,
					readme_msg, strlen(readme_msg));
}

Contributors
Person Tokens Prop Commits CommitProp
ingo molnar ingo molnar 31 77.50% 1 50.00%
eduard gabriel munteanu eduard gabriel munteanu 9 22.50% 1 50.00%
Total 40 100.00% 2 100.00%


static const struct file_operations tracing_readme_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_readme_read,
	.llseek		= generic_file_llseek,
};



static void *saved_cmdlines_next(struct seq_file *m, void *v, loff_t *pos)
{
	unsigned int *ptr = v;

	if (*pos || m->count)
		ptr++;

	(*pos)++;

	for (; ptr < &savedcmd->map_cmdline_to_pid[savedcmd->cmdline_num];
	     ptr++) {
		if (*ptr == -1 || *ptr == NO_CMDLINE_MAP)
			continue;

		return ptr;
	}

	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 62 72.94% 2 33.33%
steven rostedt steven rostedt 17 20.00% 2 33.33%
avadh patel avadh patel 4 4.71% 1 16.67%
pekka paalanen pekka paalanen 2 2.35% 1 16.67%
Total 85 100.00% 6 100.00%



static void *saved_cmdlines_start(struct seq_file *m, loff_t *pos)
{
	void *v;
	loff_t l = 0;

	preempt_disable();
	arch_spin_lock(&trace_cmdline_lock);

	v = &savedcmd->map_cmdline_to_pid[0];
	while (l <= *pos) {
		v = saved_cmdlines_next(m, v, &l);
		if (!v)
			return NULL;
	}

	return v;
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 64 84.21% 2 40.00%
steven rostedt steven rostedt 10 13.16% 2 40.00%
frederic weisbecker frederic weisbecker 2 2.63% 1 20.00%
Total 76 100.00% 5 100.00%



static void saved_cmdlines_stop(struct seq_file *m, void *v)
{
	arch_spin_unlock(&trace_cmdline_lock);
	preempt_enable();
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static int saved_cmdlines_show(struct seq_file *m, void *v)
{
	char buf[TASK_COMM_LEN];
	unsigned int *pid = v;

	__trace_find_cmdline(*pid, buf);
	seq_printf(m, "%d %s\n", *pid, buf);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 51 100.00% 1 100.00%
Total 51 100.00% 1 100.00%


static const struct seq_operations tracing_saved_cmdlines_seq_ops = {
	.start		= saved_cmdlines_start,
	.next		= saved_cmdlines_next,
	.stop		= saved_cmdlines_stop,
	.show		= saved_cmdlines_show,
};



static int tracing_saved_cmdlines_open(struct inode *inode, struct file *filp)
{
	if (tracing_disabled)
		return -ENODEV;

	return seq_open(filp, &tracing_saved_cmdlines_seq_ops);
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%


static const struct file_operations tracing_saved_cmdlines_fops = {
	.open		= tracing_saved_cmdlines_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};


static ssize_t

tracing_saved_cmdlines_size_read(struct file *filp, char __user *ubuf,
				 size_t cnt, loff_t *ppos)
{
	char buf[64];
	int r;

	arch_spin_lock(&trace_cmdline_lock);
	r = scnprintf(buf, sizeof(buf), "%u\n", savedcmd->cmdline_num);
	arch_spin_unlock(&trace_cmdline_lock);

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 70 92.11% 1 50.00%
namhyung kim namhyung kim 6 7.89% 1 50.00%
Total 76 100.00% 2 100.00%



static void free_saved_cmdlines_buffer(struct saved_cmdlines_buffer *s)
{
	kfree(s->saved_cmdlines);
	kfree(s->map_cmdline_to_pid);
	kfree(s);
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 30 100.00% 1 100.00%
Total 30 100.00% 1 100.00%



static int tracing_resize_saved_cmdlines(unsigned int val)
{
	struct saved_cmdlines_buffer *s, *savedcmd_temp;

	s = kmalloc(sizeof(*s), GFP_KERNEL);
	if (!s)
		return -ENOMEM;

	if (allocate_cmdlines_buffer(val, s) < 0) {
		kfree(s);
		return -ENOMEM;
	}

	arch_spin_lock(&trace_cmdline_lock);
	savedcmd_temp = savedcmd;
	savedcmd = s;
	arch_spin_unlock(&trace_cmdline_lock);
	free_saved_cmdlines_buffer(savedcmd_temp);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 72 80.00% 2 25.00%
steven rostedt steven rostedt 10 11.11% 3 37.50%
frederic weisbecker frederic weisbecker 4 4.44% 1 12.50%
avadh patel avadh patel 2 2.22% 1 12.50%
namhyung kim namhyung kim 2 2.22% 1 12.50%
Total 90 100.00% 8 100.00%


static ssize_t

tracing_saved_cmdlines_size_write(struct file *filp, const char __user *ubuf,
				  size_t cnt, loff_t *ppos)
{
	unsigned long val;
	int ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	/* must have at least 1 entry or less than PID_MAX_DEFAULT */
	if (!val || val > PID_MAX_DEFAULT)
		return -EINVAL;

	ret = tracing_resize_saved_cmdlines((unsigned int)val);
	if (ret < 0)
		return ret;

	*ppos += cnt;

	return cnt;
}

Contributors
Person Tokens Prop Commits CommitProp
yoshihiro yunomae yoshihiro yunomae 85 90.43% 2 28.57%
avadh patel avadh patel 4 4.26% 1 14.29%
steven rostedt steven rostedt 3 3.19% 2 28.57%
lai jiangshan lai jiangshan 2 2.13% 2 28.57%
Total 94 100.00% 7 100.00%


static const struct file_operations tracing_saved_cmdlines_size_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_saved_cmdlines_size_read,
	.write		= tracing_saved_cmdlines_size_write,
};

#ifdef CONFIG_TRACE_ENUM_MAP_FILE

static union trace_enum_map_item *

update_enum_map(union trace_enum_map_item *ptr)
{
	if (!ptr->map.enum_string) {
		if (ptr->tail.next) {
			ptr = ptr->tail.next;
			/* Set ptr to the next real item (skip head) */
			ptr++;
		} else
			return NULL;
	}
	return ptr;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 51 96.23% 5 71.43%
avadh patel avadh patel 1 1.89% 1 14.29%
jiri olsa jiri olsa 1 1.89% 1 14.29%
Total 53 100.00% 7 100.00%



static void *enum_map_next(struct seq_file *m, void *v, loff_t *pos)
{
	union trace_enum_map_item *ptr = v;

	/*
         * Paranoid! If ptr points to end, we don't want to increment past it.
         * This really should never happen.
         */
	ptr = update_enum_map(ptr);
	if (WARN_ON_ONCE(!ptr))
		return NULL;

	ptr++;

	(*pos)++;

	ptr = update_enum_map(ptr);

	return ptr;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 57 87.69% 6 66.67%
arnaldo carvalho de melo arnaldo carvalho de melo 4 6.15% 1 11.11%
eduard gabriel munteanu eduard gabriel munteanu 3 4.62% 1 11.11%
pekka paalanen pekka paalanen 1 1.54% 1 11.11%
Total 65 100.00% 9 100.00%



static void *enum_map_start(struct seq_file *m, loff_t *pos)
{
	union trace_enum_map_item *v;
	loff_t l = 0;

	mutex_lock(&trace_enum_mutex);

	v = trace_enum_maps;
	if (v)
		v++;

	while (v && l < *pos) {
		v = enum_map_next(m, v, &l);
	}

	return v;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 58 84.06% 3 60.00%
eduard gabriel munteanu eduard gabriel munteanu 8 11.59% 1 20.00%
vaibhav nagarnaik vaibhav nagarnaik 3 4.35% 1 20.00%
Total 69 100.00% 5 100.00%



static void enum_map_stop(struct seq_file *m, void *v)
{
	mutex_unlock(&trace_enum_mutex);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 21 100.00% 1 100.00%
Total 21 100.00% 1 100.00%



static int enum_map_show(struct seq_file *m, void *v)
{
	union trace_enum_map_item *ptr = v;

	seq_printf(m, "%s %ld (%s)\n",
		   ptr->map.enum_string, ptr->map.enum_value,
		   ptr->map.system);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 50 100.00% 1 100.00%
Total 50 100.00% 1 100.00%


static const struct seq_operations tracing_enum_map_seq_ops = {
	.start		= enum_map_start,
	.next		= enum_map_next,
	.stop		= enum_map_stop,
	.show		= enum_map_show,
};



static int tracing_enum_map_open(struct inode *inode, struct file *filp)
{
	if (tracing_disabled)
		return -ENODEV;

	return seq_open(filp, &tracing_enum_map_seq_ops);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%


static const struct file_operations tracing_enum_map_fops = {
	.open		= tracing_enum_map_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};


static inline union trace_enum_map_item *

trace_enum_jmp_to_tail(union trace_enum_map_item *ptr)
{
	/* Return tail of array given the head */
	return ptr + ptr->head.length + 1;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 26 100.00% 1 100.00%
Total 26 100.00% 1 100.00%


static void

trace_insert_enum_map_file(struct module *mod, struct trace_enum_map **start,
			   int len)
{
	struct trace_enum_map **stop;
	struct trace_enum_map **map;
	union trace_enum_map_item *map_array;
	union trace_enum_map_item *ptr;

	stop = start + len;

	/*
         * The trace_enum_maps contains the map plus a head and tail item,
         * where the head holds the module and length of array, and the
         * tail holds a pointer to the next list.
         */
	map_array = kmalloc(sizeof(*map_array) * (len + 2), GFP_KERNEL);
	if (!map_array) {
		pr_warn("Unable to allocate trace enum mapping\n");
		return;
	}

	mutex_lock(&trace_enum_mutex);

	if (!trace_enum_maps)
		trace_enum_maps = map_array;
	else {
		ptr = trace_enum_maps;
		for (;;) {
			ptr = trace_enum_jmp_to_tail(ptr);
			if (!ptr->tail.next)
				break;
			ptr = ptr->tail.next;

		}
		ptr->tail.next = map_array;
	}
	map_array->head.mod = mod;
	map_array->head.length = len;
	map_array++;

	for (map = start; (unsigned long)map < (unsigned long)stop; map++) {
		map_array->map = **map;
		map_array++;
	}
	memset(map_array, 0, sizeof(*map_array));

	mutex_unlock(&trace_enum_mutex);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 214 99.53% 1 50.00%
joe perches joe perches 1 0.47% 1 50.00%
Total 215 100.00% 2 100.00%



static void trace_create_enum_file(struct dentry *d_tracer)
{
	trace_create_file("enum_map", 0444, d_tracer,
			  NULL, &tracing_enum_map_fops);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%

#else /* CONFIG_TRACE_ENUM_MAP_FILE */


static inline void trace_create_enum_file(struct dentry *d_tracer) { }
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 11 100.00% 1 100.00%
Total 11 100.00% 1 100.00%



static inline void trace_insert_enum_map_file(struct module *mod,
			      struct trace_enum_map **start, int len) { }
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 20 100.00% 1 100.00%
Total 20 100.00% 1 100.00%

#endif /* !CONFIG_TRACE_ENUM_MAP_FILE */



static void trace_insert_enum_map(struct module *mod,
				  struct trace_enum_map **start, int len)
{
	struct trace_enum_map **map;

	if (len <= 0)
		return;

	map = start;

	trace_event_enum_update(map, len);

	trace_insert_enum_map_file(mod, start, len);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 53 100.00% 1 100.00%
Total 53 100.00% 1 100.00%


static ssize_t

tracing_set_trace_read(struct file *filp, char __user *ubuf,
		       size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	char buf[MAX_TRACER_SIZE+2];
	int r;

	mutex_lock(&trace_types_lock);
	r = sprintf(buf, "%s\n", tr->current_trace->name);
	mutex_unlock(&trace_types_lock);

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 84 100.00% 1 100.00%
Total 84 100.00% 1 100.00%



int tracer_init(struct tracer *t, struct trace_array *tr)
{
	tracing_reset_online_cpus(&tr->trace_buffer);
	return t->init(tr);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 31 100.00% 1 100.00%
Total 31 100.00% 1 100.00%



static void set_buffer_entries(struct trace_buffer *buf, unsigned long val)
{
	int cpu;

	for_each_tracing_cpu(cpu)
		per_cpu_ptr(buf->data, cpu)->entries = val;
}

Contributors
Person Tokens Prop Commits CommitProp
vaibhav nagarnaik vaibhav nagarnaik 17 48.57% 1 20.00%
eduard gabriel munteanu eduard gabriel munteanu 10 28.57% 1 20.00%
steven rostedt steven rostedt 8 22.86% 3 60.00%
Total 35 100.00% 5 100.00%

#ifdef CONFIG_TRACER_MAX_TRACE
/* resize @tr's buffer to the size of @size_tr's entries */


static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf,
					struct trace_buffer *size_buf, int cpu_id)
{
	int cpu, ret = 0;

	if (cpu_id == RING_BUFFER_ALL_CPUS) {
		for_each_tracing_cpu(cpu) {
			ret = ring_buffer_resize(trace_buf->buffer,
				 per_cpu_ptr(size_buf->data, cpu)->entries, cpu);
			if (ret < 0)
				break;
			per_cpu_ptr(trace_buf->data, cpu)->entries =
				per_cpu_ptr(size_buf->data, cpu)->entries;
		}
	} else {
		ret = ring_buffer_resize(trace_buf->buffer,
				 per_cpu_ptr(size_buf->data, cpu_id)->entries, cpu_id);
		if (ret == 0)
			per_cpu_ptr(trace_buf->data, cpu_id)->entries =
				per_cpu_ptr(size_buf->data, cpu_id)->entries;
	}

	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
hiraku toyooka hiraku toyooka 74 50.34% 1 20.00%
steven rostedt steven rostedt 69 46.94% 3 60.00%
lai jiangshan lai jiangshan 4 2.72% 1 20.00%
Total 147 100.00% 5 100.00%

#endif /* CONFIG_TRACER_MAX_TRACE */



static int __tracing_resize_ring_buffer(struct trace_array *tr,
					unsigned long size, int cpu)
{
	int ret;

	/*
         * If kernel or user changes the size of the ring buffer
         * we use the size that was given, and we can forget about
         * expanding it later.
         */
	ring_buffer_expanded = true;

	/* May be called before buffers are initialized */
	if (!tr->trace_buffer.buffer)
		return 0;

	ret = ring_buffer_resize(tr->trace_buffer.buffer, size, cpu);
	if (ret < 0)
		return ret;

#ifdef CONFIG_TRACER_MAX_TRACE
	if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL) ||
	    !tr->current_trace->use_max_tr)
		goto out;

	ret = ring_buffer_resize(tr->max_buffer.buffer, size, cpu);
	if (ret < 0) {
		int r = resize_buffer_duplicate_size(&tr->trace_buffer,
						     &tr->trace_buffer, cpu);
		if (r < 0) {
			/*
                         * AARGH! We are left with different
                         * size max buffer!!!!
                         * The max buffer is our "snapshot" buffer.
                         * When a tracer needs a snapshot (one of the
                         * latency tracers), it swaps the max buffer
                         * with the saved snap shot. We succeeded to
                         * update the size of the main buffer, but failed to
                         * update the size of the max buffer. But when we tried
                         * to reset the main buffer to the original size, we
                         * failed there too. This is very unlikely to
                         * happen, but if it does, warn and kill all
                         * tracing.
                         */
			WARN_ON(1);
			tracing_disabled = 1;
		}
		return ret;
	}

	if (cpu == RING_BUFFER_ALL_CPUS)
		set_buffer_entries(&tr->max_buffer, size);
	else
		per_cpu_ptr(tr->max_buffer.data, cpu)->entries = size;

 out:
#endif /* CONFIG_TRACER_MAX_TRACE */

	if (cpu == RING_BUFFER_ALL_CPUS)
		set_buffer_entries(&tr->trace_buffer, size);
	else
		per_cpu_ptr(tr->trace_buffer.data, cpu)->entries = size;

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 118 53.39% 10 50.00%
vaibhav nagarnaik vaibhav nagarnaik 37 16.74% 2 10.00%
eduard gabriel munteanu eduard gabriel munteanu 29 13.12% 1 5.00%
kosaki motohiro kosaki motohiro 10 4.52% 1 5.00%
frederic weisbecker frederic weisbecker 9 4.07% 1 5.00%
jens axboe jens axboe 8 3.62% 1 5.00%
hiraku toyooka hiraku toyooka 5 2.26% 2 10.00%
lai jiangshan lai jiangshan 5 2.26% 2 10.00%
Total 221 100.00% 20 100.00%



static ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
					  unsigned long size, int cpu_id)
{
	int ret = size;

	mutex_lock(&trace_types_lock);

	if (cpu_id != RING_BUFFER_ALL_CPUS) {
		/* make sure, this cpu is enabled in the mask */
		if (!cpumask_test_cpu(cpu_id, tracing_buffer_mask)) {
			ret = -EINVAL;
			goto out;
		}
	}

	ret = __tracing_resize_ring_buffer(tr, size, cpu_id);
	if (ret < 0)
		ret = -ENOMEM;

out:
	mutex_unlock(&trace_types_lock);

	return ret;
}


Contributors
Person Tokens Prop Commits CommitProp
vaibhav nagarnaik vaibhav nagarnaik 56 61.54% 2 40.00%
eduard gabriel munteanu eduard gabriel munteanu 28 30.77% 1 20.00%
steven rostedt steven rostedt 7 7.69% 2 40.00%
Total 91 100.00% 5 100.00%

/**
 * tracing_update_buffers - used by tracing facility to expand ring buffers
 *
 * To save on memory when the tracing is never used on a system with it
 * configured in. The ring buffers are set to a minimum size. But once
 * a user starts to use the tracing facility, then they need to grow
 * to their default size.
 *
 * This function is to be called when a tracer is about to be used.
 */


int tracing_update_buffers(void)
{
	int ret = 0;

	mutex_lock(&trace_types_lock);
	if (!ring_buffer_expanded)
		ret = __tracing_resize_ring_buffer(&global_trace, trace_buf_size,
						RING_BUFFER_ALL_CPUS);
	mutex_unlock(&trace_types_lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 23 52.27% 3 42.86%
eduard gabriel munteanu eduard gabriel munteanu 9 20.45% 1 14.29%
jens axboe jens axboe 9 20.45% 1 14.29%
vaibhav nagarnaik vaibhav nagarnaik 3 6.82% 2 28.57%
Total 44 100.00% 7 100.00%

struct trace_option_dentry;

static void
create_trace_option_files(struct trace_array *tr, struct tracer *tracer);

/*
 * Used to clear out the tracer before deletion of an instance.
 * Must have trace_types_lock held.
 */


static void tracing_set_nop(struct trace_array *tr)
{
	if (tr->current_trace == &nop_trace)
		return;
	
	tr->current_trace->enabled--;

	if (tr->current_trace->reset)
		tr->current_trace->reset(tr);

	tr->current_trace = &nop_trace;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 47 90.38% 2 66.67%
vaibhav nagarnaik vaibhav nagarnaik 5 9.62% 1 33.33%
Total 52 100.00% 3 100.00%



static void add_tracer_options(struct trace_array *tr, struct tracer *t)
{
	/* Only enable if the directory has been created already. */
	if (!tr->dir)
		return;

	create_trace_option_files(tr, t);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 24 75.00% 4 80.00%
vaibhav nagarnaik vaibhav nagarnaik 8 25.00% 1 20.00%
Total 32 100.00% 5 100.00%



static int tracing_set_tracer(struct trace_array *tr, const char *buf)
{
	struct tracer *t;
#ifdef CONFIG_TRACER_MAX_TRACE
	bool had_max_tr;
#endif
	int ret = 0;

	mutex_lock(&trace_types_lock);

	if (!ring_buffer_expanded) {
		ret = __tracing_resize_ring_buffer(tr, trace_buf_size,
						RING_BUFFER_ALL_CPUS);
		if (ret < 0)
			goto out;
		ret = 0;
	}

	for (t = trace_types; t; t = t->next) {
		if (strcmp(t->name, buf) == 0)
			break;
	}
	if (!t) {
		ret = -EINVAL;
		goto out;
	}
	if (t == tr->current_trace)
		goto out;

	/* Some tracers are only allowed for the top level buffer */
	if (!trace_ok_for_array(t, tr)) {
		ret = -EINVAL;
		goto out;
	}

	/* If trace pipe files are being read, we can't change the tracer */
	if (tr->current_trace->ref) {
		ret = -EBUSY;
		goto out;
	}

	trace_branch_disable();

	tr->current_trace->enabled--;

	if (tr->current_trace->reset)
		tr->current_trace->reset(tr);

	/* Current trace needs to be nop_trace before synchronize_sched */
	tr->current_trace = &nop_trace;

#ifdef CONFIG_TRACER_MAX_TRACE
	had_max_tr = tr->allocated_snapshot;

	if (had_max_tr && !t->use_max_tr) {
		/*
                 * We need to make sure that the update_max_tr sees that
                 * current_trace changed to nop_trace to keep it from
                 * swapping the buffers after we resize it.
                 * The update_max_tr is called from interrupts disabled
                 * so a synchronized_sched() is sufficient.
                 */
		synchronize_sched();
		free_snapshot(tr);
	}
#endif

#ifdef CONFIG_TRACER_MAX_TRACE
	if (t->use_max_tr && !had_max_tr) {
		ret = alloc_snapshot(tr);
		if (ret < 0)
			goto out;
	}
#endif

	if (t->init) {
		ret = tracer_init(t, tr);
		if (ret)
			goto out;
	}

	tr->current_trace = t;
	tr->current_trace->enabled++;
	trace_branch_enable(tr);
 out:
	mutex_unlock(&trace_types_lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 209 65.72% 16 59.26%
vaibhav nagarnaik vaibhav nagarnaik 51 16.04% 2 7.41%
frederic weisbecker frederic weisbecker 26 8.18% 3 11.11%
kosaki motohiro kosaki motohiro 15 4.72% 1 3.70%
anton vorontsov anton vorontsov 5 1.57% 1 3.70%
peter zijlstra peter zijlstra 4 1.26% 1 3.70%
eduard gabriel munteanu eduard gabriel munteanu 4 1.26% 1 3.70%
arnaldo carvalho de melo arnaldo carvalho de melo 3 0.94% 1 3.70%
hiraku toyooka hiraku toyooka 1 0.31% 1 3.70%
Total 318 100.00% 27 100.00%


static ssize_t

tracing_set_trace_write(struct file *filp, const char __user *ubuf,
			size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	char buf[MAX_TRACER_SIZE+1];
	int i;
	size_t ret;
	int err;

	ret = cnt;

	if (cnt > MAX_TRACER_SIZE)
		cnt = MAX_TRACER_SIZE;

	if (copy_from_user(buf, ubuf, cnt))
		return -EFAULT;

	buf[cnt] = 0;

	/* strip ending whitespace. */
	for (i = cnt - 1; i > 0 && isspace(buf[i]); i--)
		buf[i] = 0;

	err = tracing_set_tracer(tr, buf);
	if (err)
		return err;

	*ppos += ret;

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
peter zijlstra peter zijlstra 61 43.26% 1 5.88%
steven rostedt steven rostedt 36 25.53% 8 47.06%
eduard gabriel munteanu eduard gabriel munteanu 24 17.02% 1 5.88%
frederic weisbecker frederic weisbecker 7 4.96% 2 11.76%
vaibhav nagarnaik vaibhav nagarnaik 6 4.26% 2 11.76%
li zefan li zefan 3 2.13% 1 5.88%
jiri olsa jiri olsa 2 1.42% 1 5.88%
peter huewe peter huewe 2 1.42% 1 5.88%
Total 141 100.00% 17 100.00%


static ssize_t

tracing_nsecs_read(unsigned long *ptr, char __user *ubuf,
		   size_t cnt, loff_t *ppos)
{
	char buf[64];
	int r;

	r = snprintf(buf, sizeof(buf), "%ld\n",
		     *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr));
	if (r > sizeof(buf))
		r = sizeof(buf);
	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

Contributors
Person Tokens Prop Commits CommitProp
vaibhav nagarnaik vaibhav nagarnaik 58 61.05% 3 50.00%
steven rostedt steven rostedt 33 34.74% 2 33.33%
stanislav fomichev stanislav fomichev 4 4.21% 1 16.67%
Total 95 100.00% 6 100.00%


static ssize_t

tracing_nsecs_write(unsigned long *ptr, const char __user *ubuf,
		    size_t cnt, loff_t *ppos)
{
	unsigned long val;
	int ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	*ptr = val * 1000;

	return cnt;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 32 51.61% 3 37.50%
vaibhav nagarnaik vaibhav nagarnaik 22 35.48% 2 25.00%
stanislav fomichev stanislav fomichev 4 6.45% 1 12.50%
peter huewe peter huewe 3 4.84% 1 12.50%
hannes eder hannes eder 1 1.61% 1 12.50%
Total 62 100.00% 8 100.00%


static ssize_t

tracing_thresh_read(struct file *filp, char __user *ubuf,
		    size_t cnt, loff_t *ppos)
{
	return tracing_nsecs_read(&tracing_thresh, ubuf, cnt, ppos);
}

Contributors
Person Tokens Prop Commits CommitProp
stanislav fomichev stanislav fomichev 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%


static ssize_t

tracing_thresh_write(struct file *filp, const char __user *ubuf,
		     size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	int ret;

	mutex_lock(&trace_types_lock);
	ret = tracing_nsecs_write(&tracing_thresh, ubuf, cnt, ppos);
	if (ret < 0)
		goto out;

	if (tr->current_trace->update_thresh) {
		ret = tr->current_trace->update_thresh(tr);
		if (ret < 0)
			goto out;
	}

	ret = cnt;
out:
	mutex_unlock(&trace_types_lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
stanislav fomichev stanislav fomichev 110 100.00% 1 100.00%
Total 110 100.00% 1 100.00%

#ifdef CONFIG_TRACER_MAX_TRACE


static ssize_t

tracing_max_lat_read(struct file *filp, char __user *ubuf,
		     size_t cnt, loff_t *ppos)
{
	return tracing_nsecs_read(filp->private_data, ubuf, cnt, ppos);
}

Contributors
Person Tokens Prop Commits CommitProp
stanislav fomichev stanislav fomichev 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%


static ssize_t

tracing_max_lat_write(struct file *filp, const char __user *ubuf,
		      size_t cnt, loff_t *ppos)
{
	return tracing_nsecs_write(filp->private_data, ubuf, cnt, ppos);
}

Contributors
Person Tokens Prop Commits CommitProp
stanislav fomichev stanislav fomichev 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%

#endif



static int tracing_open_pipe(struct inode *inode, struct file *filp)
{
	struct trace_array *tr = inode->i_private;
	struct trace_iterator *iter;
	int ret = 0;

	if (tracing_disabled)
		return -ENODEV;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	mutex_lock(&trace_types_lock);

	/* create a buffer to store the information to pass to userspace */
	iter = kzalloc(sizeof(*iter), GFP_KERNEL);
	if (!iter) {
		ret = -ENOMEM;
		__trace_array_put(tr);
		goto out;
	}

	trace_seq_init(&iter->seq);
	iter->trace = tr->current_trace;

	if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) {
		ret = -ENOMEM;
		goto fail;
	}

	/* trace pipe does not show start of buffer */
	cpumask_setall(iter->started);

	if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
		iter->iter_flags |= TRACE_FILE_LAT_FMT;

	/* Output in nanoseconds only if we are using a clock in nanoseconds. */
	if (trace_clocks[tr->clock_id].in_ns)
		iter->iter_flags |= TRACE_FILE_TIME_IN_NS;

	iter->tr = tr;
	iter->trace_buffer = &tr->trace_buffer;
	iter->cpu_file = tracing_get_cpu(inode);
	mutex_init(&iter->mutex);
	filp->private_data = iter;

	if (iter->trace->pipe_open)
		iter->trace->pipe_open(iter);

	nonseekable_open(inode, filp);

	tr->current_trace->ref++;
out:
	mutex_unlock(&trace_types_lock);
	return ret;

fail:
	kfree(iter->trace);
	kfree(iter);
	__trace_array_put(tr);
	mutex_unlock(&trace_types_lock);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 152 53.71% 12 44.44%
frederic weisbecker frederic weisbecker 30 10.60% 2 7.41%
pekka paalanen pekka paalanen 25 8.83% 1 3.70%
vaibhav nagarnaik vaibhav nagarnaik 14 4.95% 1 3.70%
rusty russell rusty russell 12 4.24% 1 3.70%
david sharp david sharp 11 3.89% 1 3.70%
oleg nesterov oleg nesterov 11 3.89% 1 3.70%
zhao lei zhao lei 11 3.89% 1 3.70%
alexander z lam alexander z lam 5 1.77% 1 3.70%
arnd bergmann arnd bergmann 4 1.41% 1 3.70%
yoshihiro yunomae yoshihiro yunomae 3 1.06% 1 3.70%
thomas gleixner thomas gleixner 2 0.71% 1 3.70%
mandeep singh baines mandeep singh baines 1 0.35% 1 3.70%
marcin slusarz marcin slusarz 1 0.35% 1 3.70%
carsten emde carsten emde 1 0.35% 1 3.70%
Total 283 100.00% 27 100.00%



static int tracing_release_pipe(struct inode *inode, struct file *file)
{
	struct trace_iterator *iter = file->private_data;
	struct trace_array *tr = inode->i_private;

	mutex_lock(&trace_types_lock);

	tr->current_trace->ref--;

	if (iter->trace->pipe_close)
		iter->trace->pipe_close(iter);

	mutex_unlock(&trace_types_lock);

	free_cpumask_var(iter->started);
	mutex_destroy(&iter->mutex);
	kfree(iter);

	trace_array_put(tr);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 43 43.88% 5 45.45%
zhao lei zhao lei 33 33.67% 1 9.09%
frederic weisbecker frederic weisbecker 13 13.27% 2 18.18%
david sharp david sharp 5 5.10% 1 9.09%
oleg nesterov oleg nesterov 2 2.04% 1 9.09%
rusty russell rusty russell 2 2.04% 1 9.09%
Total 98 100.00% 11 100.00%


static unsigned int

trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table)
{
	struct trace_array *tr = iter->tr;

	/* Iterators are static, they should be filled or empty */
	if (trace_buffer_iter(iter, iter->cpu_file))
		return POLLIN | POLLRDNORM;

	if (tr->trace_flags & TRACE_ITER_BLOCK)
		/*
                 * Always select as readable when in blocking mode
                 */
		return POLLIN | POLLRDNORM;
	else
		return ring_buffer_poll_wait(iter->trace_buffer->buffer, iter->cpu_file,
					     filp, poll_table);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 38 47.50% 4 66.67%
li zefan li zefan 23 28.75% 1 16.67%
soeren sandmann pedersen* soeren sandmann pedersen* 19 23.75% 1 16.67%
Total 80 100.00% 6 100.00%


static unsigned int

tracing_poll_pipe(struct file *filp, poll_table *poll_table)
{
	struct trace_iterator *iter = filp->private_data;

	return trace_poll(iter, filp, poll_table);
}

Contributors
Person Tokens Prop Commits CommitProp
hiraku toyooka hiraku toyooka 18 51.43% 1 50.00%
steven rostedt steven rostedt 17 48.57% 1 50.00%
Total 35 100.00% 2 100.00%

/* Must be called with iter->mutex held. */


static int tracing_wait_pipe(struct file *filp)
{
	struct trace_iterator *iter = filp->private_data;
	int ret;

	while (trace_empty(iter)) {

		if ((filp->f_flags & O_NONBLOCK)) {
			return -EAGAIN;
		}

		/*
                 * We block until we read something and tracing is disabled.
                 * We still block if tracing is disabled, but we have never
                 * read anything. This allows a user to cat this file, and
                 * then enable tracing. But after we have read something,
                 * we give an EOF when tracing is again disabled.
                 *
                 * iter->pos will be 0 if we haven't read anything.
                 */
		if (!tracing_is_on() && iter->pos)
			break;

		mutex_unlock(&iter->mutex);

		ret = wait_on_pipe(iter, false);

		mutex_lock(&iter->mutex);

		if (ret)
			return ret;
	}

	return 1;
}

Contributors
Person Tokens Prop Commits CommitProp
eduard gabriel munteanu eduard gabriel munteanu 51 53.68% 1 14.29%
steven rostedt steven rostedt 23 24.21% 3 42.86%
hiraku toyooka hiraku toyooka 13 13.68% 1 14.29%
frederic weisbecker frederic weisbecker 6 6.32% 1 14.29%
rabin vincent rabin vincent 2 2.11% 1 14.29%
Total 95 100.00% 7 100.00%

/*
 * Consumer reader.
 */

static ssize_t

tracing_read_pipe(struct file *filp, char __user *ubuf,
		  size_t cnt, loff_t *ppos)
{
	struct trace_iterator *iter = filp->private_data;
	ssize_t sret;

	/* return any leftover data */
	sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
	if (sret != -EBUSY)
		return sret;

	trace_seq_init(&iter->seq);

	/*
         * Avoid more than one consumer on a single file descriptor
         * This is just a matter of traces coherency, the ring buffer itself
         * is protected.
         */
	mutex_lock(&iter->mutex);
	if (iter->trace->read) {
		sret = iter->trace->read(iter, filp, ubuf, cnt, ppos);
		if (sret)
			goto out;
	}

waitagain:
	sret = tracing_wait_pipe(filp);
	if (sret <= 0)
		goto out;

	/* stop when tracing is finished */
	if (trace_empty(iter)) {
		sret = 0;
		goto out;
	}

	if (cnt >= PAGE_SIZE)
		cnt = PAGE_SIZE - 1;

	/* reset all but tr, trace, and overruns */
	memset(&iter->seq, 0,
	       sizeof(struct trace_iterator) -
	       offsetof(struct trace_iterator, seq));
	cpumask_clear(iter->started);
	iter->pos = -1;

	trace_event_read_lock();
	trace_access_lock(iter->cpu_file);
	while (trace_find_next_entry_inc(iter) != NULL) {
		enum print_line_t ret;
		int save_len = iter->seq.seq.len;

		ret = print_trace_line(iter);
		if (ret == TRACE_TYPE_PARTIAL_LINE) {
			/* don't print partial lines */
			iter->seq.seq.len = save_len;
			break;
		}
		if (ret != TRACE_TYPE_NO_CONSUME)
			trace_consume(iter);

		if (trace_seq_used(&iter->seq) >= cnt)
			break;

		/*
                 * Setting the full flag means we reached the trace_seq buffer
                 * size and we should leave by partial output condition above.
                 * One of the trace_seq_* functions is not used properly.
                 */
		WARN_ONCE(iter->seq.full, "full flag set for trace type %d",
			  iter->ent->type);
	}
	trace_access_unlock(iter->cpu_file);
	trace_event_read_unlock();

	/* Now copy what we have to the user */
	sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
	if (iter->seq.seq.readpos >= trace_seq_used(&iter->seq))
		trace_seq_init(&iter->seq);

	/*
         * If there was nothing to send to user, in spite of consuming trace
         * entries, go back to wait for more entries.
         */
	if (sret == -EBUSY)
		goto waitagain;

out:
	mutex_unlock(&iter->mutex);

	return sret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 185 48.81% 12 46.15%
hiraku toyooka hiraku toyooka 87 22.96% 1 3.85%
pekka paalanen pekka paalanen 38 10.03% 2 7.69%
frederic weisbecker frederic weisbecker 21 5.54% 3 11.54%
jiri olsa jiri olsa 17 4.49% 1 3.85%
lai jiangshan lai jiangshan 15 3.96% 2 7.69%
andrey vagin andrey vagin 7 1.85% 1 3.85%
eduard gabriel munteanu eduard gabriel munteanu 6 1.58% 1 3.85%
arnd bergmann arnd bergmann 1 0.26% 1 3.85%
jason wessel jason wessel 1 0.26% 1 3.85%
lucas de marchi lucas de marchi 1 0.26% 1 3.85%
Total 379 100.00% 26 100.00%



static void tracing_spd_release_pipe(struct splice_pipe_desc *spd,
				     unsigned int idx)
{
	__free_page(spd->pages[idx]);
}

Contributors
Person Tokens Prop Commits CommitProp
eduard gabriel munteanu eduard gabriel munteanu 22 88.00% 1 50.00%
steven rostedt steven rostedt 3 12.00% 1 50.00%
Total 25 100.00% 2 100.00%


static const struct pipe_buf_operations tracing_pipe_buf_ops = {
	.can_merge		= 0,
	.confirm		= generic_pipe_buf_confirm,
	.release		= generic_pipe_buf_release,
	.steal			= generic_pipe_buf_steal,
	.get			= generic_pipe_buf_get,
};


static size_t

tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter)
{
	size_t count;
	int save_len;
	int ret;

	/* Seq buffer is page-sized, exactly what we need. */
	for (;;) {
		save_len = iter->seq.seq.len;
		ret = print_trace_line(iter);

		if (trace_seq_has_overflowed(&iter->seq)) {
			iter->seq.seq.len = save_len;
			break;
		}

		/*
                 * This should not be hit, because it should only
                 * be set if the iter->seq overflowed. But check it
                 * anyway to be safe.
                 */
		if (ret == TRACE_TYPE_PARTIAL_LINE) {
			iter->seq.seq.len = save_len;
			break;
		}

		count = trace_seq_used(&iter->seq) - save_len;
		if (rem < count) {
			rem = 0;
			iter->seq.seq.len = save_len;
			break;
		}

		if (ret != TRACE_TYPE_NO_CONSUME)
			trace_consume(iter);
		rem -= count;
		if (!trace_find_next_entry_inc(iter))	{
			rem = 0;
			iter->ent = NULL;
			break;
		}
	}

	return rem;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 147 89.09% 4 50.00%
vaibhav nagarnaik vaibhav nagarnaik 11 6.67% 2 25.00%
lai jiangshan lai jiangshan 6 3.64% 1 12.50%
jason wessel jason wessel 1 0.61% 1 12.50%
Total 165 100.00% 8 100.00%



static ssize_t tracing_splice_read_pipe(struct file *filp,
					loff_t *ppos,
					struct pipe_inode_info *pipe,
					size_t len,
					unsigned int flags)
{
	struct page *pages_def[PIPE_DEF_BUFFERS];
	struct partial_page partial_def[PIPE_DEF_BUFFERS];
	struct trace_iterator *iter = filp->private_data;
	struct splice_pipe_desc spd = {
		.pages		= pages_def,
		.partial	= partial_def,
		.nr_pages	= 0, /* This gets updated below. */
		.nr_pages_max	= PIPE_DEF_BUFFERS,
		.flags		= flags,
		.ops		= &tracing_pipe_buf_ops,
		.spd_release	= tracing_spd_release_pipe,
        };
	ssize_t ret;
	size_t rem;
	unsigned int i;

	if (splice_grow_spd(pipe, &spd))
		return -ENOMEM;

	mutex_lock(&iter->mutex);

	if (iter->trace->splice_read) {
		ret = iter->trace->splice_read(iter, filp,
					       ppos, pipe, len, flags);
		if (ret)
			goto out_err;
	}

	ret = tracing_wait_pipe(filp);
	if (ret <= 0)
		goto out_err;

	if (!iter->ent && !trace_find_next_entry_inc(iter)) {
		ret = -EFAULT;
		goto out_err;
	}

	trace_event_read_lock();
	trace_access_lock(iter->cpu_file);

	/* Fill as many pages as possible. */
	for (i = 0, rem = len; i < spd.nr_pages_max && rem; i++) {
		spd.pages[i] = alloc_page(GFP_KERNEL);
		if (!spd.pages[i])
			break;

		rem = tracing_fill_pipe_page(rem, iter);

		/* Copy the data into the page, so we can start over. */
		ret = trace_seq_to_buffer(&iter->seq,
					  page_address(spd.pages[i]),
					  trace_seq_used(&iter->seq));
		if (ret < 0) {
			__free_page(spd.pages[i]);
			break;
		}
		spd.partial[i].offset = 0;
		spd.partial[i].len = trace_seq_used(&iter->seq);

		trace_seq_init(&iter->seq);
	}

	trace_access_unlock(iter->cpu_file);
	trace_event_read_unlock();
	mutex_unlock(&iter->mutex);

	spd.nr_pages = i;

	if (i)
		ret = splice_to_pipe(pipe, &spd);
	else
		ret = 0;
out:
	splice_shrink_spd(&spd);
	return ret;

out_err:
	mutex_unlock(&iter->mutex);
	goto out;
}

Contributors
Person Tokens Prop Commits CommitProp
eduard gabriel munteanu eduard gabriel munteanu 198 47.14% 1 3.85%
steven rostedt steven rostedt 98 23.33% 11 42.31%
lai jiangshan lai jiangshan 40 9.52% 4 15.38%
jens axboe jens axboe 40 9.52% 1 3.85%
frederic weisbecker frederic weisbecker 13 3.10% 1 3.85%
pekka paalanen pekka paalanen 9 2.14% 1 3.85%
zhao lei zhao lei 7 1.67% 1 3.85%
li zefan li zefan 6 1.43% 1 3.85%
al viro al viro 3 0.71% 1 3.85%
eric dumazet eric dumazet 2 0.48% 1 3.85%
arnd bergmann arnd bergmann 2 0.48% 1 3.85%
hiraku toyooka hiraku toyooka 1 0.24% 1 3.85%
jason wessel jason wessel 1 0.24% 1 3.85%
Total 420 100.00% 26 100.00%


static ssize_t

tracing_entries_read(struct file *filp, char __user *ubuf,
		     size_t cnt, loff_t *ppos)
{
	struct inode *inode = file_inode(filp);
	struct trace_array *tr = inode->i_private;
	int cpu = tracing_get_cpu(inode);
	char buf[64];
	int r = 0;
	ssize_t ret;

	mutex_lock(&trace_types_lock);

	if (cpu == RING_BUFFER_ALL_CPUS) {
		int cpu, buf_size_same;
		unsigned long size;

		size = 0;
		buf_size_same = 1;
		/* check if all cpu sizes are same */
		for_each_tracing_cpu(cpu) {
			/* fill in the size from first enabled cpu */
			if (size == 0)
				size = per_cpu_ptr(tr->trace_buffer.data, cpu)->entries;
			if (size != per_cpu_ptr(tr->trace_buffer.data, cpu)->entries) {
				buf_size_same = 0;
				break;
			}
		}

		if (buf_size_same) {
			if (!ring_buffer_expanded)
				r = sprintf(buf, "%lu (expanded: %lu)\n",
					    size >> 10,
					    trace_buf_size >> 10);
			else
				r = sprintf(buf, "%lu\n", size >> 10);
		} else
			r = sprintf(buf, "X\n");
	} else
		r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10);

	mutex_unlock(&trace_types_lock);

	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
vaibhav nagarnaik vaibhav nagarnaik 126 50.60% 1 14.29%
steven rostedt steven rostedt 80 32.13% 4 57.14%
eduard gabriel munteanu eduard gabriel munteanu 28 11.24% 1 14.29%
oleg nesterov oleg nesterov 15 6.02% 1 14.29%
Total 249 100.00% 7 100.00%


static ssize_t

tracing_entries_write(struct file *filp, const char __user *ubuf,
		      size_t cnt, loff_t *ppos)
{
	struct inode *inode = file_inode(filp);
	struct trace_array *tr = inode->i_private;
	unsigned long val;
	int ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	/* must have at least 1 entry */
	if (!val)
		return -EINVAL;

	/* value is in KB */
	val <<= 10;
	ret = tracing_resize_ring_buffer(tr, val, tracing_get_cpu(inode));
	if (ret < 0)
		return ret;

	*ppos += cnt;

	return cnt;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 65 55.56% 10 62.50%
eduard gabriel munteanu eduard gabriel munteanu 22 18.80% 1 6.25%
oleg nesterov oleg nesterov 17 14.53% 1 6.25%
vaibhav nagarnaik vaibhav nagarnaik 8 6.84% 2 12.50%
peter huewe peter huewe 3 2.56% 1 6.25%
jiri olsa jiri olsa 2 1.71% 1 6.25%
Total 117 100.00% 16 100.00%


static ssize_t

tracing_total_entries_read(struct file *filp, char __user *ubuf,
				size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	char buf[64];
	int r, cpu;
	unsigned long size = 0, expanded_size = 0;

	mutex_lock(&trace_types_lock);
	for_each_tracing_cpu(cpu) {
		size += per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10;
		if (!ring_buffer_expanded)
			expanded_size += trace_buf_size >> 10;
	}
	if (ring_buffer_expanded)
		r = sprintf(buf, "%lu\n", size);
	else
		r = sprintf(buf, "%lu (expanded: %lu)\n", size, expanded_size);
	mutex_unlock(&trace_types_lock);

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

Contributors
Person Tokens Prop Commits CommitProp
vaibhav nagarnaik vaibhav nagarnaik 136 95.77% 3 60.00%
steven rostedt steven rostedt 6 4.23% 2 40.00%
Total 142 100.00% 5 100.00%


static ssize_t

tracing_free_buffer_write(struct file *filp, const char __user *ubuf,
			  size_t cnt, loff_t *ppos)
{
	/*
         * There is no need to read what the user has written, this function
         * is just to make sure that there is no error when "echo" is used
         */

	*ppos += cnt;

	return cnt;
}

Contributors
Person Tokens Prop Commits CommitProp
vaibhav nagarnaik vaibhav nagarnaik 30 90.91% 2 66.67%
steven rostedt steven rostedt 3 9.09% 1 33.33%
Total 33 100.00% 3 100.00%


static int

tracing_free_buffer_release(struct inode *inode, struct file *filp)
{
	struct trace_array *tr = inode->i_private;

	/* disable tracing ? */
	if (tr->trace_flags & TRACE_ITER_STOP_ON_FREE)
		tracer_tracing_off(tr);
	/* resize the ring buffer to 0 */
	tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS);

	trace_array_put(tr);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 32 56.14% 6 66.67%
vaibhav nagarnaik vaibhav nagarnaik 21 36.84% 2 22.22%
alexander z lam alexander z lam 4 7.02% 1 11.11%
Total 57 100.00% 9 100.00%


static ssize_t

tracing_mark_write(struct file *filp, const char __user *ubuf,
					size_t cnt, loff_t *fpos)
{
	unsigned long addr = (unsigned long)ubuf;
	struct trace_array *tr = filp->private_data;
	struct ring_buffer_event *event;
	struct ring_buffer *buffer;
	struct print_entry *entry;
	unsigned long irq_flags;
	struct page *pages[2];
	void *map_page[2];
	int nr_pages = 1;
	ssize_t written;
	int offset;
	int size;
	int len;
	int ret;
	int i;

	if (tracing_disabled)
		return -EINVAL;

	if (!(tr->trace_flags & TRACE_ITER_MARKERS))
		return -EINVAL;

	if (cnt > TRACE_BUF_SIZE)
		cnt = TRACE_BUF_SIZE;

	/*
         * Userspace is injecting traces into the kernel trace buffer.
         * We want to be as non intrusive as possible.
         * To do so, we do not want to allocate any special buffers
         * or take any locks, but instead write the userspace data
         * straight into the ring buffer.
         *
         * First we need to pin the userspace buffer into memory,
         * which, most likely it is, because it just referenced it.
         * But there's no guarantee that it is. By using get_user_pages_fast()
         * and kmap_atomic/kunmap_atomic() we can get access to the
         * pages directly. We then write the data directly into the
         * ring buffer.
         */
	BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE);

	/* check if we cross pages */
	if ((addr & PAGE_MASK) != ((addr + cnt) & PAGE_MASK))
		nr_pages = 2;

	offset = addr & (PAGE_SIZE - 1);
	addr &= PAGE_MASK;

	ret = get_user_pages_fast(addr, nr_pages, 0, pages);
	if (ret < nr_pages) {
		while (--ret >= 0)
			put_page(pages[ret]);
		written = -EFAULT;
		goto out;
	}

	for (i = 0; i < nr_pages; i++)
		map_page[i] = kmap_atomic(pages[i]);

	local_save_flags(irq_flags);
	size = sizeof(*entry) + cnt + 2; /* possible \n added */
	buffer = tr->trace_buffer.buffer;
	event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
					  irq_flags, preempt_count());
	if (!event) {
		/* Ring buffer disabled, return as if not open for write */
		written = -EBADF;
		goto out_unlock;
	}

	entry = ring_buffer_event_data(event);
	entry->ip = _THIS_IP_;

	if (nr_pages == 2) {
		len = PAGE_SIZE - offset;
		memcpy(&entry->buf, map_page[0] + offset, len);
		memcpy(&entry->buf[len], map_page[1], cnt - len);
	} else
		memcpy(&entry->buf, map_page[0] + offset, cnt);

	if (entry->buf[cnt - 1] != '\n') {
		entry->buf[cnt] = '\n';
		entry->buf[cnt + 1] = '\0';
	} else
		entry->buf[cnt] = '\0';

	__buffer_unlock_commit(buffer, event);

	written = cnt;

	*fpos += written;

 out_unlock:
	for (i = nr_pages - 1; i >= 0; i--) {
		kunmap_atomic(map_page[i]);
		put_page(pages[i]);
	}
 out:
	return written;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 339 69.33% 5 45.45%
pekka paalanen pekka paalanen 87 17.79% 1 9.09%
carsten emde carsten emde 27 5.52% 1 9.09%
mandeep singh baines mandeep singh baines 13 2.66% 1 9.09%
alexander z lam alexander z lam 11 2.25% 1 9.09%
vikram mulukutla vikram mulukutla 6 1.23% 1 9.09%
marcin slusarz marcin slusarz 6 1.23% 1 9.09%
Total 489 100.00% 11 100.00%



static int tracing_clock_show(struct seq_file *m, void *v)
{
	struct trace_array *tr = m->private;
	int i;

	for (i = 0; i < ARRAY_SIZE(trace_clocks); i++)
		seq_printf(m,
			"%s%s%s%s", i ? " " : "",
			i == tr->clock_id ? "[" : "", trace_clocks[i].name,
			i == tr->clock_id ? "]" : "");
	seq_putc(m, '\n');

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zhao lei zhao lei 66 70.97% 1 33.33%
steven rostedt steven rostedt 15 16.13% 1 33.33%
li zefan li zefan 12 12.90% 1 33.33%
Total 93 100.00% 3 100.00%



static int tracing_set_clock(struct trace_array *tr, const char *clockstr)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) {
		if (strcmp(trace_clocks[i].name, clockstr) == 0)
			break;
	}
	if (i == ARRAY_SIZE(trace_clocks))
		return -EINVAL;

	mutex_lock(&trace_types_lock);

	tr->clock_id = i;

	ring_buffer_set_clock(tr->trace_buffer.buffer, trace_clocks[i].func);

	/*
         * New clock may not be consistent with the previous clock.
         * Reset the buffer so that it doesn't have incomparable timestamps.
         */
	tracing_reset_online_cpus(&tr->trace_buffer);

#ifdef CONFIG_TRACER_MAX_TRACE
	if (tr->flags & TRACE_ARRAY_FL_GLOBAL && tr->max_buffer.buffer)
		ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func);
	tracing_reset_online_cpus(&tr->max_buffer);
#endif

	mutex_unlock(&trace_types_lock);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zhao lei zhao lei 100 64.10% 1 16.67%
steven rostedt steven rostedt 47 30.13% 3 50.00%
david sharp david sharp 5 3.21% 1 16.67%
alexander z lam alexander z lam 4 2.56% 1 16.67%
Total 156 100.00% 6 100.00%



static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
				   size_t cnt, loff_t *fpos)
{
	struct seq_file *m = filp->private_data;
	struct trace_array *tr = m->private;
	char buf[64];
	const char *clockstr;
	int ret;

	if (cnt >= sizeof(buf))
		return -EINVAL;

	if (copy_from_user(buf, ubuf, cnt))
		return -EFAULT;

	buf[cnt] = 0;

	clockstr = strstrip(buf);

	ret = tracing_set_clock(tr, clockstr);
	if (ret)
		return ret;

	*fpos += cnt;

	return cnt;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 113 92.62% 1 50.00%
zhao lei zhao lei 9 7.38% 1 50.00%
Total 122 100.00% 2 100.00%



static int tracing_clock_open(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	int ret;

	if (tracing_disabled)
		return -ENODEV;

	if (trace_array_get(tr))
		return -ENODEV;

	ret = single_open(file, tracing_clock_show, inode->i_private);
	if (ret < 0)
		trace_array_put(tr);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 41 55.41% 2 66.67%
li zefan li zefan 33 44.59% 1 33.33%
Total 74 100.00% 3 100.00%


struct ftrace_buffer_info {
	
struct trace_iterator	iter;
	
void			*spare;
	
unsigned int		read;
};

#ifdef CONFIG_TRACER_SNAPSHOT


static int tracing_snapshot_open(struct inode *inode, struct file *file)
{
	struct trace_array *tr = inode->i_private;
	struct trace_iterator *iter;
	struct seq_file *m;
	int ret = 0;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	if (file->f_mode & FMODE_READ) {
		iter = __tracing_open(inode, file, true);
		if (IS_ERR(iter))
			ret = PTR_ERR(iter);
	} else {
		/* Writes still need the seq_file to hold the private data */
		ret = -ENOMEM;
		m = kzalloc(sizeof(*m), GFP_KERNEL);
		if (!m)
			goto out;
		iter = kzalloc(sizeof(*iter), GFP_KERNEL);
		if (!iter) {
			kfree(m);
			goto out;
		}
		ret = 0;

		iter->tr = tr;
		iter->trace_buffer = &tr->max_buffer;
		iter->cpu_file = tracing_get_cpu(inode);
		m->private = iter;
		file->private_data = m;
	}
out:
	if (ret < 0)
		trace_array_put(tr);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 115 56.93% 4 57.14%
hiraku toyooka hiraku toyooka 64 31.68% 1 14.29%
alexander z lam alexander z lam 17 8.42% 1 14.29%
oleg nesterov oleg nesterov 6 2.97% 1 14.29%
Total 202 100.00% 7 100.00%


static ssize_t

tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt,
		       loff_t *ppos)
{
	struct seq_file *m = filp->private_data;
	struct trace_iterator *iter = m->private;
	struct trace_array *tr = iter->tr;
	unsigned long val;
	int ret;

	ret = tracing_update_buffers();
	if (ret < 0)
		return ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	mutex_lock(&trace_types_lock);

	if (tr->current_trace->use_max_tr) {
		ret = -EBUSY;
		goto out;
	}

	switch (val) {
	case 0:
		if (iter->cpu_file != RING_BUFFER_ALL_CPUS) {
			ret = -EINVAL;
			break;
		}
		if (tr->allocated_snapshot)
			free_snapshot(tr);
		break;
	case 1:
/* Only allow per-cpu swap if the ring buffer supports it */
#ifndef CONFIG_RING_BUFFER_ALLOW_SWAP
		if (iter->cpu_file != RING_BUFFER_ALL_CPUS) {
			ret = -EINVAL;
			break;
		}
#endif
		if (!tr->allocated_snapshot) {
			ret = alloc_snapshot(tr);
			if (ret < 0)
				break;
		}
		local_irq_disable();
		/* Now, we're going to swap */
		if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
			update_max_tr(tr, current, smp_processor_id());
		else
			update_max_tr_single(tr, current, iter->cpu_file);
		local_irq_enable();
		break;
	default:
		if (tr->allocated_snapshot) {
			if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
				tracing_reset_online_cpus(&tr->max_buffer);
			else
				tracing_reset(&tr->max_buffer, iter->cpu_file);
		}
		break;
	}

	if (ret >= 0) {
		*ppos += cnt;
		ret = cnt;
	}
out:
	mutex_unlock(&trace_types_lock);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
hiraku toyooka hiraku toyooka 183 59.61% 1 16.67%
steven rostedt steven rostedt 124 40.39% 5 83.33%
Total 307 100.00% 6 100.00%



static int tracing_snapshot_release(struct inode *inode, struct file *file)
{
	struct seq_file *m = file->private_data;
	int ret;

	ret = tracing_release(inode, file);

	if (file->f_mode & FMODE_READ)
		return ret;

	/* If write only, the seq_file is just a stub */
	if (m)
		kfree(m->private);
	kfree(m);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 68 100.00% 2 100.00%
Total 68 100.00% 2 100.00%

static int tracing_buffers_open(struct inode *inode, struct file *filp);
static ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf,
				    size_t count, loff_t *ppos);
static int tracing_buffers_release(struct inode *inode, struct file *file);
static ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos,
		   struct pipe_inode_info *pipe, size_t len, unsigned int flags);



static int snapshot_raw_open(struct inode *inode, struct file *filp)
{
	struct ftrace_buffer_info *info;
	int ret;

	ret = tracing_buffers_open(inode, filp);
	if (ret < 0)
		return ret;

	info = filp->private_data;

	if (info->iter.trace->use_max_tr) {
		tracing_buffers_release(inode, filp);
		return -EBUSY;
	}

	info->iter.snapshot = true;
	info->iter.trace_buffer = &info->iter.tr->max_buffer;

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 97 100.00% 1 100.00%
Total 97 100.00% 1 100.00%

#endif /* CONFIG_TRACER_SNAPSHOT */



static const struct file_operations tracing_thresh_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_thresh_read,
	.write		= tracing_thresh_write,
	.llseek		= generic_file_llseek,
};

#ifdef CONFIG_TRACER_MAX_TRACE

static const struct file_operations tracing_max_lat_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_max_lat_read,
	.write		= tracing_max_lat_write,
	.llseek		= generic_file_llseek,
};
#endif


static const struct file_operations set_tracer_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_set_trace_read,
	.write		= tracing_set_trace_write,
	.llseek		= generic_file_llseek,
};


static const struct file_operations tracing_pipe_fops = {
	.open		= tracing_open_pipe,
	.poll		= tracing_poll_pipe,
	.read		= tracing_read_pipe,
	.splice_read	= tracing_splice_read_pipe,
	.release	= tracing_release_pipe,
	.llseek		= no_llseek,
};


static const struct file_operations tracing_entries_fops = {
	.open		= tracing_open_generic_tr,
	.read		= tracing_entries_read,
	.write		= tracing_entries_write,
	.llseek		= generic_file_llseek,
	.release	= tracing_release_generic_tr,
};


static const struct file_operations tracing_total_entries_fops = {
	.open		= tracing_open_generic_tr,
	.read		= tracing_total_entries_read,
	.llseek		= generic_file_llseek,
	.release	= tracing_release_generic_tr,
};


static const struct file_operations tracing_free_buffer_fops = {
	.open		= tracing_open_generic_tr,
	.write		= tracing_free_buffer_write,
	.release	= tracing_free_buffer_release,
};


static const struct file_operations tracing_mark_fops = {
	.open		= tracing_open_generic_tr,
	.write		= tracing_mark_write,
	.llseek		= generic_file_llseek,
	.release	= tracing_release_generic_tr,
};


static const struct file_operations trace_clock_fops = {
	.open		= tracing_clock_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= tracing_single_release_tr,
	.write		= tracing_clock_write,
};

#ifdef CONFIG_TRACER_SNAPSHOT

static const struct file_operations snapshot_fops = {
	.open		= tracing_snapshot_open,
	.read		= seq_read,
	.write		= tracing_snapshot_write,
	.llseek		= tracing_lseek,
	.release	= tracing_snapshot_release,
};


static const struct file_operations snapshot_raw_fops = {
	.open		= snapshot_raw_open,
	.read		= tracing_buffers_read,
	.release	= tracing_buffers_release,
	.splice_read	= tracing_buffers_splice_read,
	.llseek		= no_llseek,
};

#endif /* CONFIG_TRACER_SNAPSHOT */



static int tracing_buffers_open(struct inode *inode, struct file *filp)
{
	struct trace_array *tr = inode->i_private;
	struct ftrace_buffer_info *info;
	int ret;

	if (tracing_disabled)
		return -ENODEV;

	if (trace_array_get(tr) < 0)
		return -ENODEV;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		trace_array_put(tr);
		return -ENOMEM;
	}

	mutex_lock(&trace_types_lock);

	info->iter.tr		= tr;
	info->iter.cpu_file	= tracing_get_cpu(inode);
	info->iter.trace	= tr->current_trace;
	info->iter.trace_buffer = &tr->trace_buffer;
	info->spare		= NULL;
	/* Force reading ring buffer for first read */
	info->read		= (unsigned int)-1;

	filp->private_data = info;

	tr->current_trace->ref++;

	mutex_unlock(&trace_types_lock);

	ret = nonseekable_open(inode, filp);
	if (ret < 0)
		trace_array_put(tr);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 176 93.12% 9 75.00%
lai jiangshan lai jiangshan 7 3.70% 2 16.67%
oleg nesterov oleg nesterov 6 3.17% 1 8.33%
Total 189 100.00% 12 100.00%


static unsigned int

tracing_buffers_poll(struct file *filp, poll_table *poll_table)
{
	struct ftrace_buffer_info *info = filp->private_data;
	struct trace_iterator *iter = &info->iter;

	return trace_poll(iter, filp, poll_table);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 45 100.00% 2 100.00%
Total 45 100.00% 2 100.00%


static ssize_t

tracing_buffers_read(struct file *filp, char __user *ubuf,
		     size_t count, loff_t *ppos)
{
	struct ftrace_buffer_info *info = filp->private_data;
	struct trace_iterator *iter = &info->iter;
	ssize_t ret;
	ssize_t size;

	if (!count)
		return 0;

#ifdef CONFIG_TRACER_MAX_TRACE
	if (iter->snapshot && iter->tr->current_trace->use_max_tr)
		return -EBUSY;
#endif

	if (!info->spare)
		info->spare = ring_buffer_alloc_read_page(iter->trace_buffer->buffer,
							  iter->cpu_file);
	if (!info->spare)
		return -ENOMEM;

	/* Do we have previous read data to read? */
	if (info->read < PAGE_SIZE)
		goto read;

 again:
	trace_access_lock(iter->cpu_file);
	ret = ring_buffer_read_page(iter->trace_buffer->buffer,
				    &info->spare,
				    count,
				    iter->cpu_file, 0);
	trace_access_unlock(iter->cpu_file);

	if (ret < 0) {
		if (trace_empty(iter)) {
			if ((filp->f_flags & O_NONBLOCK))
				return -EAGAIN;

			ret = wait_on_pipe(iter, false);
			if (ret)
				return ret;

			goto again;
		}
		return 0;
	}

	info->read = 0;
 read:
	size = PAGE_SIZE - info->read;
	if (size > count)
		size = count;

	ret = copy_to_user(ubuf, info->spare + info->read, size);
	if (ret == size)
		return -EFAULT;

	size -= ret;

	*ppos += size;
	info->read += size;

	return size;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 251 86.55% 11 73.33%
lai jiangshan lai jiangshan 35 12.07% 2 13.33%
vaibhav nagarnaik vaibhav nagarnaik 2 0.69% 1 6.67%
rabin vincent rabin vincent 2 0.69% 1 6.67%
Total 290 100.00% 15 100.00%



static int tracing_buffers_release(struct inode *inode, struct file *file)
{
	struct ftrace_buffer_info *info = file->private_data;
	struct trace_iterator *iter = &info->iter;

	mutex_lock(&trace_types_lock);

	iter->tr->current_trace->ref--;

	__trace_array_put(iter->tr);

	if (info->spare)
		ring_buffer_free_read_page(iter->trace_buffer->buffer, info->spare);
	kfree(info);

	mutex_unlock(&trace_types_lock);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 84 93.33% 6 85.71%
lai jiangshan lai jiangshan 6 6.67% 1 14.29%
Total 90 100.00% 7 100.00%


struct buffer_ref {
	
struct ring_buffer	*buffer;
	
void			*page;
	
int			ref;
};



static void buffer_pipe_buf_release(struct pipe_inode_info *pipe,
				    struct pipe_buffer *buf)
{
	struct buffer_ref *ref = (struct buffer_ref *)buf->private;

	if (--ref->ref)
		return;

	ring_buffer_free_read_page(ref->buffer, ref->page);
	kfree(ref);
	buf->private = 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 60 100.00% 1 100.00%
Total 60 100.00% 1 100.00%



static void buffer_pipe_buf_get(struct pipe_inode_info *pipe,
				struct pipe_buffer *buf)
{
	struct buffer_ref *ref = (struct buffer_ref *)buf->private;

	ref->ref++;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 35 100.00% 1 100.00%
Total 35 100.00% 1 100.00%

/* Pipe buffer operations for a buffer. */

static const struct pipe_buf_operations buffer_pipe_buf_ops = {
	.can_merge		= 0,
	.confirm		= generic_pipe_buf_confirm,
	.release		= buffer_pipe_buf_release,
	.steal			= generic_pipe_buf_steal,
	.get			= buffer_pipe_buf_get,
};

/*
 * Callback from splice_to_pipe(), if we need to release some pages
 * at the end of the spd in case we error'ed out in filling the pipe.
 */


static void buffer_spd_release(struct splice_pipe_desc *spd, unsigned int i)
{
	struct buffer_ref *ref =
		(struct buffer_ref *)spd->partial[i].private;

	if (--ref->ref)
		return;

	ring_buffer_free_read_page(ref->buffer, ref->page);
	kfree(ref);
	spd->partial[i].private = 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 69 100.00% 1 100.00%
Total 69 100.00% 1 100.00%


static ssize_t

tracing_buffers_splice_read(struct file *file, loff_t *ppos,
			    struct pipe_inode_info *pipe, size_t len,
			    unsigned int flags)
{
	struct ftrace_buffer_info *info = file->private_data;
	struct trace_iterator *iter = &info->iter;
	struct partial_page partial_def[PIPE_DEF_BUFFERS];
	struct page *pages_def[PIPE_DEF_BUFFERS];
	struct splice_pipe_desc spd = {
		.pages		= pages_def,
		.partial	= partial_def,
		.nr_pages_max	= PIPE_DEF_BUFFERS,
		.flags		= flags,
		.ops		= &buffer_pipe_buf_ops,
		.spd_release	= buffer_spd_release,
        };
	struct buffer_ref *ref;
	int entries, size, i;
	ssize_t ret = 0;

#ifdef CONFIG_TRACER_MAX_TRACE
	if (iter->snapshot && iter->tr->current_trace->use_max_tr)
		return -EBUSY;
#endif

	if (splice_grow_spd(pipe, &spd))
		return -ENOMEM;

	if (*ppos & (PAGE_SIZE - 1))
		return -EINVAL;

	if (len & (PAGE_SIZE - 1)) {
		if (len < PAGE_SIZE)
			return -EINVAL;
		len &= PAGE_MASK;
	}

 again:
	trace_access_lock(iter->cpu_file);
	entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file);

	for (i = 0; i < spd.nr_pages_max && len && entries; i++, len -= PAGE_SIZE) {
		struct page *page;
		int r;

		ref = kzalloc(sizeof(*ref), GFP_KERNEL);
		if (!ref) {
			ret = -ENOMEM;
			break;
		}

		ref->ref = 1;
		ref->buffer = iter->trace_buffer->buffer;
		ref->page = ring_buffer_alloc_read_page(ref->buffer, iter->cpu_file);
		if (!ref->page) {
			ret = -ENOMEM;
			kfree(ref);
			break;
		}

		r = ring_buffer_read_page(ref->buffer, &ref->page,
					  len, iter->cpu_file, 1);
		if (r < 0) {
			ring_buffer_free_read_page(ref->buffer, ref->page);
			kfree(ref);
			break;
		}

		/*
                 * zero out any left over data, this is going to
                 * user land.
                 */
		size = ring_buffer_page_len(ref->page);
		if (size < PAGE_SIZE)
			memset(ref->page + size, 0, PAGE_SIZE - size);

		page = virt_to_page(ref->page);

		spd.pages[i] = page;
		spd.partial[i].len = PAGE_SIZE;
		spd.partial[i].offset = 0;
		spd.partial[i].private = (unsigned long)ref;
		spd.nr_pages++;
		*ppos += PAGE_SIZE;

		entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file);
	}

	trace_access_unlock(iter->cpu_file);
	spd.nr_pages = i;

	/* did we read anything? */
	if (!spd.nr_pages) {
		if (ret)
			return ret;

		if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK))
			return -EAGAIN;

		ret = wait_on_pipe(iter, true);
		if (ret)
			return ret;

		goto again;
	}

	ret = splice_to_pipe(pipe, &spd);
	splice_shrink_spd(&spd);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 466 81.33% 11 55.00%
lai jiangshan lai jiangshan 53 9.25% 3 15.00%
jens axboe jens axboe 24 4.19% 1 5.00%
rabin vincent rabin vincent 20 3.49% 2 10.00%
eric dumazet eric dumazet 5 0.87% 1 5.00%
al viro al viro 3 0.52% 1 5.00%
vaibhav nagarnaik vaibhav nagarnaik 2 0.35% 1 5.00%
Total 573 100.00% 20 100.00%


static const struct file_operations tracing_buffers_fops = {
	.open		= tracing_buffers_open,
	.read		= tracing_buffers_read,
	.poll		= tracing_buffers_poll,
	.release	= tracing_buffers_release,
	.splice_read	= tracing_buffers_splice_read,
	.llseek		= no_llseek,
};


static ssize_t

tracing_stats_read(struct file *filp, char __user *ubuf,
		   size_t count, loff_t *ppos)
{
	struct inode *inode = file_inode(filp);
	struct trace_array *tr = inode->i_private;
	struct trace_buffer *trace_buf = &tr->trace_buffer;
	int cpu = tracing_get_cpu(inode);
	struct trace_seq *s;
	unsigned long cnt;
	unsigned long long t;
	unsigned long usec_rem;

	s = kmalloc(sizeof(*s), GFP_KERNEL);
	if (!s)
		return -ENOMEM;

	trace_seq_init(s);

	cnt = ring_buffer_entries_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "entries: %ld\n", cnt);

	cnt = ring_buffer_overrun_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "overrun: %ld\n", cnt);

	cnt = ring_buffer_commit_overrun_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "commit overrun: %ld\n", cnt);

	cnt = ring_buffer_bytes_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "bytes: %ld\n", cnt);

	if (trace_clocks[tr->clock_id].in_ns) {
		/* local or global for trace_clock */
		t = ns2usecs(ring_buffer_oldest_event_ts(trace_buf->buffer, cpu));
		usec_rem = do_div(t, USEC_PER_SEC);
		trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n",
								t, usec_rem);

		t = ns2usecs(ring_buffer_time_stamp(trace_buf->buffer, cpu));
		usec_rem = do_div(t, USEC_PER_SEC);
		trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem);
	} else {
		/* counter or tsc mode for trace_clock */
		trace_seq_printf(s, "oldest event ts: %llu\n",
				ring_buffer_oldest_event_ts(trace_buf->buffer, cpu));

		trace_seq_printf(s, "now ts: %llu\n",
				ring_buffer_time_stamp(trace_buf->buffer, cpu));
	}

	cnt = ring_buffer_dropped_events_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "dropped events: %ld\n", cnt);

	cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu);
	trace_seq_printf(s, "read events: %ld\n", cnt);

	count = simple_read_from_buffer(ubuf, count, ppos,
					s->buffer, trace_seq_used(s));

	kfree(s);

	return count;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 193 52.02% 6 46.15%
vaibhav nagarnaik vaibhav nagarnaik 94 25.34% 1 7.69%
yoshihiro yunomae yoshihiro yunomae 48 12.94% 2 15.38%
slava pestov slava pestov 19 5.12% 1 7.69%
oleg nesterov oleg nesterov 15 4.04% 1 7.69%
roel kluin roel kluin 1 0.27% 1 7.69%
li zefan li zefan 1 0.27% 1 7.69%
Total 371 100.00% 13 100.00%


static const struct file_operations tracing_stats_fops = {
	.open		= tracing_open_generic_tr,
	.read		= tracing_stats_read,
	.llseek		= generic_file_llseek,
	.release	= tracing_release_generic_tr,
};

#ifdef CONFIG_DYNAMIC_FTRACE



int __weak ftrace_arch_read_dyn_info(char *buf, int size)
{
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 13 81.25% 1 33.33%
jens axboe jens axboe 2 12.50% 1 33.33%
lai jiangshan lai jiangshan 1 6.25% 1 33.33%
Total 16 100.00% 3 100.00%


static ssize_t

tracing_read_dyn_info(struct file *filp, char __user *ubuf,
		  size_t cnt, loff_t *ppos)
{
	static char ftrace_dyn_info_buffer[1024];
	static DEFINE_MUTEX(dyn_info_mutex);
	unsigned long *p = filp->private_data;
	char *buf = ftrace_dyn_info_buffer;
	int size = ARRAY_SIZE(ftrace_dyn_info_buffer);
	int r;

	mutex_lock(&dyn_info_mutex);
	r = sprintf(buf, "%ld ", *p);

	r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r);
	buf[r++] = '\n';

	r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);

	mutex_unlock(&dyn_info_mutex);

	return r;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 126 97.67% 6 75.00%
jens axboe jens axboe 2 1.55% 1 12.50%
vaibhav nagarnaik vaibhav nagarnaik 1 0.78% 1 12.50%
Total 129 100.00% 8 100.00%


static const struct file_operations tracing_dyn_info_fops = {
	.open		= tracing_open_generic,
	.read		= tracing_read_dyn_info,
	.llseek		= generic_file_llseek,
};
#endif /* CONFIG_DYNAMIC_FTRACE */

#if defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE)

static void

ftrace_snapshot(unsigned long ip, unsigned long parent_ip, void **data)
{
	tracing_snapshot();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 22 100.00% 2 100.00%
Total 22 100.00% 2 100.00%


static void

ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip, void **data)
{
	unsigned long *count = (long *)data;

	if (!*count)
		return;

	if (*count != -1)
		(*count)--;

	tracing_snapshot();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 54 100.00% 2 100.00%
Total 54 100.00% 2 100.00%


static int

ftrace_snapshot_print(struct seq_file *m, unsigned long ip,
		      struct ftrace_probe_ops *ops, void *data)
{
	long count = (long)data;

	seq_printf(m, "%ps:", (void *)ip);

	seq_puts(m, "snapshot");

	if (count == -1)
		seq_puts(m, ":unlimited\n");
	else
		seq_printf(m, ":count=%ld\n", count);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 77 97.47% 2 66.67%
rasmus villemoes rasmus villemoes 2 2.53% 1 33.33%
Total 79 100.00% 3 100.00%


static struct ftrace_probe_ops snapshot_probe_ops = {
	.func			= ftrace_snapshot,
	.print			= ftrace_snapshot_print,
};


static struct ftrace_probe_ops snapshot_count_probe_ops = {
	.func			= ftrace_count_snapshot,
	.print			= ftrace_snapshot_print,
};


static int

ftrace_trace_snapshot_callback(struct ftrace_hash *hash,
			       char *glob, char *cmd, char *param, int enable)
{
	struct ftrace_probe_ops *ops;
	void *count = (void *)-1;
	char *number;
	int ret;

	/* hash funcs only work with set_ftrace_filter */
	if (!enable)
		return -EINVAL;

	ops = param ? &snapshot_count_probe_ops :  &snapshot_probe_ops;

	if (glob[0] == '!') {
		unregister_ftrace_function_probe_func(glob+1, ops);
		return 0;
	}

	if (!param)
		goto out_reg;

	number = strsep(&param, ":");

	if (!strlen(number))
		goto out_reg;

	/*
         * We use the callback data field (which is a pointer)
         * as our counter.
         */
	ret = kstrtoul(number, 0, (unsigned long *)&count);
	if (ret)
		return ret;

 out_reg:
	ret = register_ftrace_function_probe(glob, ops, count);

	if (ret >= 0)
		alloc_snapshot(&global_trace);

	return ret < 0 ? ret : 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 175 97.22% 2 50.00%
jens axboe jens axboe 4 2.22% 1 25.00%
lai jiangshan lai jiangshan 1 0.56% 1 25.00%
Total 180 100.00% 4 100.00%


static struct ftrace_func_command ftrace_snapshot_cmd = {
	.name			= "snapshot",
	.func			= ftrace_trace_snapshot_callback,
};



static __init int register_snapshot_cmd(void)
{
	return register_ftrace_command(&ftrace_snapshot_cmd);
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 15 93.75% 2 66.67%
tom zanussi tom zanussi 1 6.25% 1 33.33%
Total 16 100.00% 3 100.00%

#else


static inline __init int register_snapshot_cmd(void) { return 0; }
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 12 92.31% 2 66.67%
tom zanussi tom zanussi 1 7.69% 1 33.33%
Total 13 100.00% 3 100.00%

#endif /* defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) */



static struct dentry *tracing_get_dentry(struct trace_array *tr)
{
	if (WARN_ON(!tr->dir))
		return ERR_PTR(-ENODEV);

	/* Top directory uses NULL as the parent */
	if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
		return NULL;

	/* All sub buffers have a descriptor */
	return tr->dir;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 48 100.00% 7 100.00%
Total 48 100.00% 7 100.00%



static struct dentry *tracing_dentry_percpu(struct trace_array *tr, int cpu)
{
	struct dentry *d_tracer;

	if (tr->percpu_dir)
		return tr->percpu_dir;

	d_tracer = tracing_get_dentry(tr);
	if (IS_ERR(d_tracer))
		return NULL;

	tr->percpu_dir = tracefs_create_dir("per_cpu", d_tracer);

	WARN_ONCE(!tr->percpu_dir,
		  "Could not create tracefs directory 'per_cpu/%d'\n", cpu);

	return tr->percpu_dir;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 51 66.23% 5 62.50%
frederic weisbecker frederic weisbecker 24 31.17% 1 12.50%
vaibhav nagarnaik vaibhav nagarnaik 1 1.30% 1 12.50%
josh triplett josh triplett 1 1.30% 1 12.50%
Total 77 100.00% 8 100.00%


static struct dentry *

trace_create_cpu_file(const char *name, umode_t mode, struct dentry *parent,
		      void *data, long cpu, const struct file_operations *fops)
{
	struct dentry *ret = trace_create_file(name, mode, parent, data, fops);

	if (ret) /* See tracing_get_cpu() */
		d_inode(ret)->i_cdev = (void *)(cpu + 1);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
oleg nesterov oleg nesterov 73 94.81% 1 33.33%
david howells david howells 3 3.90% 1 33.33%
frederic weisbecker frederic weisbecker 1 1.30% 1 33.33%
Total 77 100.00% 3 100.00%


static void

tracing_init_tracefs_percpu(struct trace_array *tr, long cpu)
{
	struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu);
	struct dentry *d_cpu;
	char cpu_dir[30]; /* 30 characters should be more than enough */

	if (!d_percpu)
		return;

	snprintf(cpu_dir, 30, "cpu%ld", cpu);
	d_cpu = tracefs_create_dir(cpu_dir, d_percpu);
	if (!d_cpu) {
		pr_warn("Could not create tracefs '%s' entry\n", cpu_dir);
		return;
	}

	/* per cpu trace_pipe */
	trace_create_cpu_file("trace_pipe", 0444, d_cpu,
				tr, cpu, &tracing_pipe_fops);

	/* per cpu trace */
	trace_create_cpu_file("trace", 0644, d_cpu,
				tr, cpu, &tracing_fops);

	trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu,
				tr, cpu, &tracing_buffers_fops);

	trace_create_cpu_file("stats", 0444, d_cpu,
				tr, cpu, &tracing_stats_fops);

	trace_create_cpu_file("buffer_size_kb", 0444, d_cpu,
				tr, cpu, &tracing_entries_fops);

#ifdef CONFIG_TRACER_SNAPSHOT
	trace_create_cpu_file("snapshot", 0644, d_cpu,
				tr, cpu, &snapshot_fops);

	trace_create_cpu_file("snapshot_raw", 0444, d_cpu,
				tr, cpu, &snapshot_raw_fops);
#endif
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 64 32.32% 8 38.10%
frederic weisbecker frederic weisbecker 55 27.78% 2 9.52%
vaibhav nagarnaik vaibhav nagarnaik 42 21.21% 2 9.52%
oleg nesterov oleg nesterov 29 14.65% 6 28.57%
namhyung kim namhyung kim 6 3.03% 1 4.76%
joe perches joe perches 1 0.51% 1 4.76%
yoshihiro yunomae yoshihiro yunomae 1 0.51% 1 4.76%
Total 198 100.00% 21 100.00%

#ifdef CONFIG_FTRACE_SELFTEST
/* Let selftest have access to static functions in this file */
#include "trace_selftest.c"
#endif


static ssize_t

trace_options_read(struct file *filp, char __user *ubuf, size_t cnt,
			loff_t *ppos)
{
	struct trace_option_dentry *topt = filp->private_data;
	char *buf;

	if (topt->flags->val & topt->opt->bit)
		buf = "1\n";
	else
		buf = "0\n";

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 70 95.89% 2 66.67%
yoshihiro yunomae yoshihiro yunomae 3 4.11% 1 33.33%
Total 73 100.00% 3 100.00%


static ssize_t

trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt,
			 loff_t *ppos)
{
	struct trace_option_dentry *topt = filp->private_data;
	unsigned long val;
	int ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	if (val != 0 && val != 1)
		return -EINVAL;

	if (!!(topt->flags->val & topt->opt->bit) != val) {
		mutex_lock(&trace_types_lock);
		ret = __set_tracer_option(topt->tr, topt->flags,
					  topt->opt, !val);
		mutex_unlock(&trace_types_lock);
		if (ret)
			return ret;
	}

	*ppos += cnt;

	return cnt;
}


Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 114 79.17% 6 60.00%
li zefan li zefan 16 11.11% 1 10.00%
yoshihiro yunomae yoshihiro yunomae 7 4.86% 1 10.00%
slava pestov slava pestov 4 2.78% 1 10.00%
peter huewe peter huewe 3 2.08% 1 10.00%
Total 144 100.00% 10 100.00%


static const struct file_operations trace_options_fops = {
	.open = tracing_open_generic,
	.read = trace_options_read,
	.write = trace_options_write,
	.llseek	= generic_file_llseek,
};

/*
 * In order to pass in both the trace_array descriptor as well as the index
 * to the flag that the trace option file represents, the trace_array
 * has a character array of trace_flags_index[], which holds the index
 * of the bit for the flag it represents. index[0] == 0, index[1] == 1, etc.
 * The address of this character array is passed to the flag option file
 * read/write callbacks.
 *
 * In order to extract both the index and the trace_array descriptor,
 * get_tr_index() uses the following algorithm.
 *
 *   idx = *ptr;
 *
 * As the pointer itself contains the address of the index (remember
 * index[1] == 1).
 *
 * Then to get the trace_array descriptor, by subtracting that index
 * from the ptr, we get to the start of the index itself.
 *
 *   ptr - idx == &index[0]
 *
 * Then a simple container_of() from that pointer gets us to the
 * trace_array descriptor.
 */


static void get_tr_index(void *data, struct trace_array **ptr,
			 unsigned int *pindex)
{
	*pindex = *(unsigned char *)data;

	*ptr = container_of(data - *pindex, struct trace_array,
			    trace_flags_index);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%


static ssize_t

trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt,
			loff_t *ppos)
{
	void *tr_index = filp->private_data;
	struct trace_array *tr;
	unsigned int index;
	char *buf;

	get_tr_index(tr_index, &tr, &index);

	if (tr->trace_flags & (1 << index))
		buf = "1\n";
	else
		buf = "0\n";

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 90 100.00% 4 100.00%
Total 90 100.00% 4 100.00%


static ssize_t

trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt,
			 loff_t *ppos)
{
	void *tr_index = filp->private_data;
	struct trace_array *tr;
	unsigned int index;
	unsigned long val;
	int ret;

	get_tr_index(tr_index, &tr, &index);

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	if (val != 0 && val != 1)
		return -EINVAL;

	mutex_lock(&trace_types_lock);
	ret = set_tracer_flag(tr, 1 << index, val);
	mutex_unlock(&trace_types_lock);

	if (ret < 0)
		return ret;

	*ppos += cnt;

	return cnt;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 124 91.18% 9 81.82%
zhao lei zhao lei 10 7.35% 1 9.09%
peter huewe peter huewe 2 1.47% 1 9.09%
Total 136 100.00% 11 100.00%


static const struct file_operations trace_options_core_fops = {
	.open = tracing_open_generic,
	.read = trace_options_core_read,
	.write = trace_options_core_write,
	.llseek = generic_file_llseek,
};



struct dentry *trace_create_file(const char *name,
				 umode_t mode,
				 struct dentry *parent,
				 void *data,
				 const struct file_operations *fops)
{
	struct dentry *ret;

	ret = tracefs_create_file(name, mode, parent, data, fops);
	if (!ret)
		pr_warn("Could not create tracefs '%s' entry\n", name);

	return ret;
}


Contributors
Person Tokens Prop Commits CommitProp
frederic weisbecker frederic weisbecker 36 55.38% 1 16.67%
steven rostedt steven rostedt 27 41.54% 3 50.00%
al viro al viro 1 1.54% 1 16.67%
joe perches joe perches 1 1.54% 1 16.67%
Total 65 100.00% 6 100.00%



static struct dentry *trace_options_init_dentry(struct trace_array *tr)
{
	struct dentry *d_tracer;

	if (tr->options)
		return tr->options;

	d_tracer = tracing_get_dentry(tr);
	if (IS_ERR(d_tracer))
		return NULL;

	tr->options = tracefs_create_dir("options", d_tracer);
	if (!tr->options) {
		pr_warn("Could not create tracefs directory 'options'\n");
		return NULL;
	}

	return tr->options;
}

Contributors
Person Tokens Prop Commits CommitProp
frederic weisbecker frederic weisbecker 47 59.49% 1 11.11%
steven rostedt steven rostedt 30 37.97% 6 66.67%
josh triplett josh triplett 1 1.27% 1 11.11%
joe perches joe perches 1 1.27% 1 11.11%
Total 79 100.00% 9 100.00%


static void

create_trace_option_file(struct trace_array *tr,
			 struct trace_option_dentry *topt,
			 struct tracer_flags *flags,
			 struct tracer_opt *opt)
{
	struct dentry *t_options;

	t_options = trace_options_init_dentry(tr);
	if (!t_options)
		return;

	topt->flags = flags;
	topt->opt = opt;
	topt->tr = tr;

	topt->entry = trace_create_file(opt->name, 0644, t_options, topt,
				    &trace_options_fops);

}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 52 63.41% 3 50.00%
frederic weisbecker frederic weisbecker 30 36.59% 3 50.00%
Total 82 100.00% 6 100.00%


static void

create_trace_option_files(struct trace_array *tr, struct tracer *tracer)
{
	struct trace_option_dentry *topts;
	struct trace_options *tr_topts;
	struct tracer_flags *flags;
	struct tracer_opt *opts;
	int cnt;
	int i;

	if (!tracer)
		return;

	flags = tracer->flags;

	if (!flags || !flags->opts)
		return;

	/*
         * If this is an instance, only create flags for tracers
         * the instance may have.
         */
	if (!trace_ok_for_array(tracer, tr))
		return;

	for (i = 0; i < tr->nr_topts; i++) {
		/* Make sure there's no duplicate flags. */
		if (WARN_ON_ONCE(tr->topts[i].tracer->flags == tracer->flags))
			return;
	}

	opts = flags->opts;

	for (cnt = 0; opts[cnt].name; cnt++)
		;

	topts = kcalloc(cnt + 1, sizeof(*topts), GFP_KERNEL);
	if (!topts)
		return;

	tr_topts = krealloc(tr->topts, sizeof(*tr->topts) * (tr->nr_topts + 1),
			    GFP_KERNEL);
	if (!tr_topts) {
		kfree(topts);
		return;
	}

	tr->topts = tr_topts;
	tr->topts[tr->nr_topts].tracer = tracer;
	tr->topts[tr->nr_topts].topts = topts;
	tr->nr_topts++;

	for (cnt = 0; opts[cnt].name; cnt++) {
		create_trace_option_file(tr, &topts[cnt], flags,
					 &opts[cnt]);
		WARN_ONCE(topts[cnt].entry == NULL,
			  "Failed to create trace option: %s",
			  opts[cnt].name);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 286 96.30% 7 77.78%
vaibhav nagarnaik vaibhav nagarnaik 7 2.36% 1 11.11%
chunyu hu chunyu hu 4 1.35% 1 11.11%
Total 297 100.00% 9 100.00%


static struct dentry *

create_trace_option_core_file(struct trace_array *tr,
			      const char *option, long index)
{
	struct dentry *t_options;

	t_options = trace_options_init_dentry(tr);
	if (!t_options)
		return NULL;

	return trace_create_file(option, 0644, t_options,
				 (void *)&tr->trace_flags_index[index],
				 &trace_options_core_fops);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 64 96.97% 4 80.00%
frederic weisbecker frederic weisbecker 2 3.03% 1 20.00%
Total 66 100.00% 5 100.00%



static void create_trace_options_dir(struct trace_array *tr)
{
	struct dentry *t_options;
	bool top_level = tr == &global_trace;
	int i;

	t_options = trace_options_init_dentry(tr);
	if (!t_options)
		return;

	for (i = 0; trace_options[i]; i++) {
		if (top_level ||
		    !((1 << i) & TOP_LEVEL_TRACE_FLAGS))
			create_trace_option_core_file(tr, trace_options[i], i);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 81 97.59% 4 66.67%
li zefan li zefan 1 1.20% 1 16.67%
peter huewe peter huewe 1 1.20% 1 16.67%
Total 83 100.00% 6 100.00%


static ssize_t

rb_simple_read(struct file *filp, char __user *ubuf,
	       size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	char buf[64];
	int r;

	r = tracer_tracing_is_on(tr);
	r = sprintf(buf, "%d\n", r);

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 73 100.00% 5 100.00%
Total 73 100.00% 5 100.00%


static ssize_t

rb_simple_write(struct file *filp, const char __user *ubuf,
		size_t cnt, loff_t *ppos)
{
	struct trace_array *tr = filp->private_data;
	struct ring_buffer *buffer = tr->trace_buffer.buffer;
	unsigned long val;
	int ret;

	ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
	if (ret)
		return ret;

	if (buffer) {
		mutex_lock(&trace_types_lock);
		if (val) {
			tracer_tracing_on(tr);
			if (tr->current_trace->start)
				tr->current_trace->start(tr);
		} else {
			tracer_tracing_off(tr);
			if (tr->current_trace->stop)
				tr->current_trace->stop(tr);
		}
		mutex_unlock(&trace_types_lock);
	}

	(*ppos)++;

	return cnt;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 144 94.74% 9 81.82%
zhao lei zhao lei 5 3.29% 1 9.09%
peter huewe peter huewe 3 1.97% 1 9.09%
Total 152 100.00% 11 100.00%


static const struct file_operations rb_simple_fops = {
	.open		= tracing_open_generic_tr,
	.read		= rb_simple_read,
	.write		= rb_simple_write,
	.release	= tracing_release_generic_tr,
	.llseek		= default_llseek,
};


struct dentry *trace_instance_dir;

static void
init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer);


static int

allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size)
{
	enum ring_buffer_flags rb_flags;

	rb_flags = tr->trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0;

	buf->tr = tr;

	buf->buffer = ring_buffer_alloc(size, rb_flags);
	if (!buf->buffer)
		return -ENOMEM;

	buf->data = alloc_percpu(struct trace_array_cpu);
	if (!buf->data) {
		ring_buffer_free(buf->buffer);
		return -ENOMEM;
	}

	/* Allocate the first page for all buffers */
	set_buffer_entries(&tr->trace_buffer,
			   ring_buffer_size(tr->trace_buffer.buffer, 0));

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 99 85.34% 6 85.71%
frederic weisbecker frederic weisbecker 17 14.66% 1 14.29%
Total 116 100.00% 7 100.00%



static int allocate_trace_buffers(struct trace_array *tr, int size)
{
	int ret;

	ret = allocate_trace_buffer(tr, &tr->trace_buffer, size);
	if (ret)
		return ret;

#ifdef CONFIG_TRACER_MAX_TRACE
	ret = allocate_trace_buffer(tr, &tr->max_buffer,
				    allocate_snapshot ? size : 1);
	if (WARN_ON(ret)) {
		ring_buffer_free(tr->trace_buffer.buffer);
		free_percpu(tr->trace_buffer.data);
		return -ENOMEM;
	}
	tr->allocated_snapshot = allocate_snapshot;

	/*
         * Only the top level trace array gets its snapshot allocated
         * from the kernel command line.
         */
	allocate_snapshot = false;
#endif
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 106 100.00% 6 100.00%
Total 106 100.00% 6 100.00%



static void free_trace_buffer(struct trace_buffer *buf)
{
	if (buf->buffer) {
		ring_buffer_free(buf->buffer);
		buf->buffer = NULL;
		free_percpu(buf->data);
		buf->data = NULL;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 45 100.00% 2 100.00%
Total 45 100.00% 2 100.00%



static void free_trace_buffers(struct trace_array *tr)
{
	if (!tr)
		return;

	free_trace_buffer(&tr->trace_buffer);

#ifdef CONFIG_TRACER_MAX_TRACE
	free_trace_buffer(&tr->max_buffer);
#endif
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 38 100.00% 2 100.00%
Total 38 100.00% 2 100.00%



static void init_trace_flags_index(struct trace_array *tr)
{
	int i;

	/* Used by the trace options files */
	for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++)
		tr->trace_flags_index[i] = i;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%



static void __update_tracer_options(struct trace_array *tr)
{
	struct tracer *t;

	for (t = trace_types; t; t = t->next)
		add_tracer_options(tr, t);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%



static void update_tracer_options(struct trace_array *tr)
{
	mutex_lock(&trace_types_lock);
	__update_tracer_options(tr);
	mutex_unlock(&trace_types_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%



static int instance_mkdir(const char *name)
{
	struct trace_array *tr;
	int ret;

	mutex_lock(&trace_types_lock);

	ret = -EEXIST;
	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
		if (tr->name && strcmp(tr->name, name) == 0)
			goto out_unlock;
	}

	ret = -ENOMEM;
	tr = kzalloc(sizeof(*tr), GFP_KERNEL);
	if (!tr)
		goto out_unlock;

	tr->name = kstrdup(name, GFP_KERNEL);
	if (!tr->name)
		goto out_free_tr;

	if (!alloc_cpumask_var(&tr->tracing_cpumask, GFP_KERNEL))
		goto out_free_tr;

	tr->trace_flags = global_trace.trace_flags & ~ZEROED_TRACE_FLAGS;

	cpumask_copy(tr->tracing_cpumask, cpu_all_mask);

	raw_spin_lock_init(&tr->start_lock);

	tr->max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;

	tr->current_trace = &nop_trace;

	INIT_LIST_HEAD(&tr->systems);
	INIT_LIST_HEAD(&tr->events);

	if (allocate_trace_buffers(tr, trace_buf_size) < 0)
		goto out_free_tr;

	tr->dir = tracefs_create_dir(name, trace_instance_dir);
	if (!tr->dir)
		goto out_free_tr;

	ret = event_trace_add_tracer(tr->dir, tr);
	if (ret) {
		tracefs_remove_recursive(tr->dir);
		goto out_free_tr;
	}

	init_tracer_tracefs(tr, tr->dir);
	init_trace_flags_index(tr);
	__update_tracer_options(tr);

	list_add(&tr->list, &ftrace_trace_arrays);

	mutex_unlock(&trace_types_lock);

	return 0;

 out_free_tr:
	free_trace_buffers(tr);
	free_cpumask_var(tr->tracing_cpumask);
	kfree(tr->name);
	kfree(tr);

 out_unlock:
	mutex_unlock(&trace_types_lock);

	return ret;

}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 281 87.54% 13 86.67%
alexander z lam alexander z lam 40 12.46% 2 13.33%
Total 321 100.00% 15 100.00%



static int instance_rmdir(const char *name)
{
	struct trace_array *tr;
	int found = 0;
	int ret;
	int i;

	mutex_lock(&trace_types_lock);

	ret = -ENODEV;
	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
		if (tr->name && strcmp(tr->name, name) == 0) {
			found = 1;
			break;
		}
	}
	if (!found)
		goto out_unlock;

	ret = -EBUSY;
	if (tr->ref || (tr->current_trace && tr->current_trace->ref))
		goto out_unlock;

	list_del(&tr->list);

	/* Disable all the flags that were enabled coming in */
	for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++) {
		if ((1 << i) & ZEROED_TRACE_FLAGS)
			set_tracer_flag(tr, 1 << i, 0);
	}

	tracing_set_nop(tr);
	event_trace_del_tracer(tr);
	ftrace_destroy_function_files(tr);
	tracefs_remove_recursive(tr->dir);
	free_trace_buffers(tr);

	for (i = 0; i < tr->nr_topts; i++) {
		kfree(tr->topts[i].topts);
	}
	kfree(tr->topts);

	kfree(tr->name);
	kfree(tr);

	ret = 0;

 out_unlock:
	mutex_unlock(&trace_types_lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 240 99.59% 10 90.91%
jiaxing wang jiaxing wang 1 0.41% 1 9.09%
Total 241 100.00% 11 100.00%



static __init void create_trace_instances(struct dentry *d_tracer)
{
	trace_instance_dir = tracefs_create_instance_dir("instances", d_tracer,
							 instance_mkdir,
							 instance_rmdir);
	if (WARN_ON(!trace_instance_dir))
		return;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 34 100.00% 3 100.00%
Total 34 100.00% 3 100.00%


static void

init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
{
	int cpu;

	trace_create_file("available_tracers", 0444, d_tracer,
			tr, &show_traces_fops);

	trace_create_file("current_tracer", 0644, d_tracer,
			tr, &set_tracer_fops);

	trace_create_file("tracing_cpumask", 0644, d_tracer,
			  tr, &tracing_cpumask_fops);

	trace_create_file("trace_options", 0644, d_tracer,
			  tr, &tracing_iter_fops);

	trace_create_file("trace", 0644, d_tracer,
			  tr, &tracing_fops);

	trace_create_file("trace_pipe", 0444, d_tracer,
			  tr, &tracing_pipe_fops);

	trace_create_file("buffer_size_kb", 0644, d_tracer,
			  tr, &tracing_entries_fops);

	trace_create_file("buffer_total_size_kb", 0444, d_tracer,
			  tr, &tracing_total_entries_fops);

	trace_create_file("free_buffer", 0200, d_tracer,
			  tr, &tracing_free_buffer_fops);

	trace_create_file("trace_marker", 0220, d_tracer,
			  tr, &tracing_mark_fops);

	trace_create_file("trace_clock", 0644, d_tracer, tr,
			  &trace_clock_fops);

	trace_create_file("tracing_on", 0644, d_tracer,
			  tr, &rb_simple_fops);

	create_trace_options_dir(tr);

#ifdef CONFIG_TRACER_MAX_TRACE
	trace_create_file("tracing_max_latency", 0644, d_tracer,
			&tr->max_latency, &tracing_max_lat_fops);
#endif

	if (ftrace_create_function_files(tr, d_tracer))
		WARN(1, "Could not allocate function filter files");

#ifdef CONFIG_TRACER_SNAPSHOT
	trace_create_file("snapshot", 0644, d_tracer,
			  tr, &snapshot_fops);
#endif

	for_each_tracing_cpu(cpu)
		tracing_init_tracefs_percpu(tr, cpu);

}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 230 88.46% 14 77.78%
alexander z lam alexander z lam 14 5.38% 1 5.56%
frederic weisbecker frederic weisbecker 9 3.46% 1 5.56%
ingo molnar ingo molnar 6 2.31% 1 5.56%
wang yanqing wang yanqing 1 0.38% 1 5.56%
Total 260 100.00% 18 100.00%



static struct vfsmount *trace_automount(void *ingore)
{
	struct vfsmount *mnt;
	struct file_system_type *type;

	/*
         * To maintain backward compatibility for tools that mount
         * debugfs to get to the tracing facility, tracefs is automatically
         * mounted to the debugfs/tracing directory.
         */
	type = get_fs_type("tracefs");
	if (!type)
		return NULL;
	mnt = vfs_kern_mount(type, 0, "tracefs", NULL);
	put_filesystem(type);
	if (IS_ERR(mnt))
		return NULL;
	mntget(mnt);

	return mnt;
}

Contributors
Person Tokens Prop Commits CommitProp
linus torvalds linus torvalds 74 100.00% 1 100.00%
Total 74 100.00% 1 100.00%

/**
 * tracing_init_dentry - initialize top level trace array
 *
 * This is called when creating files or directories in the tracing
 * directory. It is called via fs_initcall() by any of the boot up code
 * and expects to return the dentry of the top level tracing directory.
 */


struct dentry *tracing_init_dentry(void)
{
	struct trace_array *tr = &global_trace;

	/* The top level trace array uses  NULL as parent */
	if (tr->dir)
		return NULL;

	if (WARN_ON(!tracefs_initialized()) ||
		(IS_ENABLED(CONFIG_DEBUG_FS) &&
		 WARN_ON(!debugfs_initialized())))
		return ERR_PTR(-ENODEV);

	/*
         * As there may still be users that expect the tracing
         * files to exist in debugfs/tracing, we must automount
         * the tracefs file system there, so older tools still
         * work with the newer kerenl.
         */
	tr->dir = debugfs_create_automount("tracing", NULL,
					   trace_automount, NULL);
	if (!tr->dir) {
		pr_warn_once("Could not create debugfs directory 'tracing'\n");
		return ERR_PTR(-ENOMEM);
	}

	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 74 76.29% 1 33.33%
jiaxing wang jiaxing wang 14 14.43% 1 33.33%
linus torvalds linus torvalds 9 9.28% 1 33.33%
Total 97 100.00% 3 100.00%

extern struct trace_enum_map *__start_ftrace_enum_maps[];
extern struct trace_enum_map *__stop_ftrace_enum_maps[];



static void __init trace_enum_init(void)
{
	int len;

	len = __stop_ftrace_enum_maps - __start_ftrace_enum_maps;
	trace_insert_enum_map(NULL, __start_ftrace_enum_maps, len);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 27 100.00% 3 100.00%
Total 27 100.00% 3 100.00%

#ifdef CONFIG_MODULES


static void trace_module_add_enums(struct module *mod)
{
	if (!mod->num_trace_enums)
		return;

	/*
         * Modules with bad taint do not have events created, do
         * not bother with enums either.
         */
	if (trace_module_has_bad_taint(mod))
		return;

	trace_insert_enum_map(mod, mod->trace_enums, mod->num_trace_enums);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 41 100.00% 4 100.00%
Total 41 100.00% 4 100.00%

#ifdef CONFIG_TRACE_ENUM_MAP_FILE


static void trace_module_remove_enums(struct module *mod)
{
	union trace_enum_map_item *map;
	union trace_enum_map_item **last = &trace_enum_maps;

	if (!mod->num_trace_enums)
		return;

	mutex_lock(&trace_enum_mutex);

	map = trace_enum_maps;

	while (map) {
		if (map->head.mod == mod)
			break;
		map = trace_enum_jmp_to_tail(map);
		last = &map->tail.next;
		map = map->tail.next;
	}
	if (!map)
		goto out;

	*last = trace_enum_jmp_to_tail(map)->tail.next;
	kfree(map);
 out:
	mutex_unlock(&trace_enum_mutex);
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 117 100.00% 2 100.00%
Total 117 100.00% 2 100.00%

#else


static inline void trace_module_remove_enums(struct module *mod) { }
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 11 100.00% 1 100.00%
Total 11 100.00% 1 100.00%

#endif /* CONFIG_TRACE_ENUM_MAP_FILE */



static int trace_module_notify(struct notifier_block *self,
			       unsigned long val, void *data)
{
	struct module *mod = data;

	switch (val) {
	case MODULE_STATE_COMING:
		trace_module_add_enums(mod);
		break;
	case MODULE_STATE_GOING:
		trace_module_remove_enums(mod);
		break;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 53 100.00% 3 100.00%
Total 53 100.00% 3 100.00%


static struct notifier_block trace_module_nb = {
	.notifier_call = trace_module_notify,
	.priority = 0,
};
#endif /* CONFIG_MODULES */



static __init int tracer_init_tracefs(void)
{
	struct dentry *d_tracer;

	trace_access_lock_init();

	d_tracer = tracing_init_dentry();
	if (IS_ERR(d_tracer))
		return 0;

	init_tracer_tracefs(&global_trace, d_tracer);

	trace_create_file("tracing_thresh", 0644, d_tracer,
			&global_trace, &tracing_thresh_fops);

	trace_create_file("README", 0444, d_tracer,
			NULL, &tracing_readme_fops);

	trace_create_file("saved_cmdlines", 0444, d_tracer,
			NULL, &tracing_saved_cmdlines_fops);

	trace_create_file("saved_cmdlines_size", 0644, d_tracer,
			  NULL, &tracing_saved_cmdlines_size_fops);

	trace_enum_init();

	trace_create_enum_file(d_tracer);

#ifdef CONFIG_MODULES
	register_module_notifier(&trace_module_nb);
#endif

#ifdef CONFIG_DYNAMIC_FTRACE
	trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
			&ftrace_update_tot_cnt, &tracing_dyn_info_fops);
#endif

	create_trace_instances(d_tracer);

	update_tracer_options(&global_trace);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 77 51.33% 11 45.83%
frederic weisbecker frederic weisbecker 24 16.00% 3 12.50%
yoshihiro yunomae yoshihiro yunomae 14 9.33% 1 4.17%
lai jiangshan lai jiangshan 11 7.33% 3 12.50%
avadh patel avadh patel 10 6.67% 1 4.17%
namhyung kim namhyung kim 6 4.00% 1 4.17%
hiraku toyooka hiraku toyooka 4 2.67% 1 4.17%
stanislav fomichev stanislav fomichev 2 1.33% 1 4.17%
ingo molnar ingo molnar 1 0.67% 1 4.17%
li zefan li zefan 1 0.67% 1 4.17%
Total 150 100.00% 24 100.00%



static int trace_panic_handler(struct notifier_block *this,
			       unsigned long event, void *unused)
{
	if (ftrace_dump_on_oops)
		ftrace_dump(ftrace_dump_on_oops);
	return NOTIFY_OK;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 28 90.32% 4 80.00%
frederic weisbecker frederic weisbecker 3 9.68% 1 20.00%
Total 31 100.00% 5 100.00%


static struct notifier_block trace_panic_notifier = {
	.notifier_call  = trace_panic_handler,
	.next           = NULL,
	.priority       = 150   /* priority: INT_MAX >= x >= 0 */
};



static int trace_die_handler(struct notifier_block *self,
			     unsigned long val,
			     void *data)
{
	switch (val) {
	case DIE_OOPS:
		if (ftrace_dump_on_oops)
			ftrace_dump(ftrace_dump_on_oops);
		break;
	default:
		break;
	}
	return NOTIFY_OK;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 40 93.02% 3 75.00%
frederic weisbecker frederic weisbecker 3 6.98% 1 25.00%
Total 43 100.00% 4 100.00%


static struct notifier_block trace_die_notifier = {
	.notifier_call = trace_die_handler,
	.priority = 200
};

/*
 * printk is set to max of 1024, we really don't need it that big.
 * Nothing should be printing 1000 characters anyway.
 */

#define TRACE_MAX_PRINT		1000

/*
 * Define here KERN_TRACE so that we have one place to modify
 * it if we decide to change what log level the ftrace dump
 * should be at.
 */

#define KERN_TRACE		KERN_EMERG


void

trace_printk_seq(struct trace_seq *s)
{
	/* Probably should print a warning here. */
	if (s->seq.len >= TRACE_MAX_PRINT)
		s->seq.len = TRACE_MAX_PRINT;

	/*
         * More paranoid code. Although the buffer size is set to
         * PAGE_SIZE, and TRACE_MAX_PRINT is 1000, this is just
         * an extra layer of protection.
         */
	if (WARN_ON_ONCE(s->seq.len >= s->seq.size))
		s->seq.len = s->seq.size - 1;

	/* should be zero ended, but we are paranoid. */
	s->buffer[s->seq.len] = 0;

	printk(KERN_TRACE "%s", s->buffer);

	trace_seq_init(s);
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 88 97.78% 6 85.71%
jovi zhangwei jovi zhangwei 2 2.22% 1 14.29%
Total 90 100.00% 7 100.00%



void trace_init_global_iter(struct trace_iterator *iter)
{
	iter->tr = &global_trace;
	iter->trace = iter->tr->current_trace;
	iter->cpu_file = RING_BUFFER_ALL_CPUS;
	iter->trace_buffer = &global_trace.trace_buffer;

	if (iter->trace && iter->trace->open)
		iter->trace->open(iter);

	/* Annotate start of buffers if we had overruns */
	if (ring_buffer_overruns(iter->trace_buffer->buffer))
		iter->iter_flags |= TRACE_FILE_ANNOTATE;

	/* Output in nanoseconds only if we are using a clock in nanoseconds. */
	if (trace_clocks[iter->tr->clock_id].in_ns)
		iter->iter_flags |= TRACE_FILE_TIME_IN_NS;
}

Contributors
Person Tokens Prop Commits CommitProp
cody p schafer cody p schafer 59 58.42% 1 20.00%
jason wessel jason wessel 29 28.71% 1 20.00%
steven rostedt steven rostedt 13 12.87% 3 60.00%
Total 101 100.00% 5 100.00%



void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
{
	/* use static because iter can be a bit big for the stack */
	static struct trace_iterator iter;
	static atomic_t dump_running;
	struct trace_array *tr = &global_trace;
	unsigned int old_userobj;
	unsigned long flags;
	int cnt = 0, cpu;

	/* Only allow one dump user at a time. */
	if (atomic_inc_return(&dump_running) != 1) {
		atomic_dec(&dump_running);
		return;
	}

	/*
         * Always turn off tracing when we dump.
         * We don't need to show trace output of what happens
         * between multiple crashes.
         *
         * If the user does a sysrq-z, then they can re-enable
         * tracing with echo 1 > tracing_on.
         */
	tracing_off();

	local_irq_save(flags);

	/* Simulate the iterator */
	trace_init_global_iter(&iter);

	for_each_tracing_cpu(cpu) {
		atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
	}

	old_userobj = tr->trace_flags & TRACE_ITER_SYM_USEROBJ;

	/* don't look at user memory in panic mode */
	tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ;

	switch (oops_dump_mode) {
	case DUMP_ALL:
		iter.cpu_file = RING_BUFFER_ALL_CPUS;
		break;
	case DUMP_ORIG:
		iter.cpu_file = raw_smp_processor_id();
		break;
	case DUMP_NONE:
		goto out_enable;
	default:
		printk(KERN_TRACE "Bad dumping mode, switching to all CPUs dump\n");
		iter.cpu_file = RING_BUFFER_ALL_CPUS;
	}

	printk(KERN_TRACE "Dumping ftrace buffer:\n");

	/* Did function tracer already get disabled? */
	if (ftrace_is_dead()) {
		printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n");
		printk("#          MAY BE MISSING FUNCTION EVENTS\n");
	}

	/*
         * We need to stop all tracing on all CPUS to read the
         * the next buffer. This is a bit expensive, but is
         * not done often. We fill all what we can read,
         * and then release the locks again.
         */

	while (!trace_empty(&iter)) {

		if (!cnt)
			printk(KERN_TRACE "---------------------------------\n");

		cnt++;

		/* reset all but tr, trace, and overruns */
		memset(&iter.seq, 0,
		       sizeof(struct trace_iterator) -
		       offsetof(struct trace_iterator, seq));
		iter.iter_flags |= TRACE_FILE_LAT_FMT;
		iter.pos = -1;

		if (trace_find_next_entry_inc(&iter) != NULL) {
			int ret;

			ret = print_trace_line(&iter);
			if (ret != TRACE_TYPE_NO_CONSUME)
				trace_consume(&iter);
		}
		touch_nmi_watchdog();

		trace_printk_seq(&iter.seq);
	}

	if (!cnt)
		printk(KERN_TRACE "   (ftrace buffer empty)\n");
	else
		printk(KERN_TRACE "---------------------------------\n");

 out_enable:
	tr->trace_flags |= old_userobj;

	for_each_tracing_cpu(cpu) {
		atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
	}
 	atomic_dec(&dump_running);
	local_irq_restore(flags);
}
Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 242 67.79% 13 65.00%
frederic weisbecker frederic weisbecker 86 24.09% 2 10.00%
lai jiangshan lai jiangshan 11 3.08% 1 5.00%
jason wessel jason wessel 10 2.80% 1 5.00%
torok edwin torok edwin 6 1.68% 1 5.00%
jovi zhang jovi zhang 1 0.28% 1 5.00%
umesh tiwari umesh tiwari 1 0.28% 1 5.00%
Total 357 100.00% 20 100.00%


EXPORT_SYMBOL_GPL(ftrace_dump);



__init static int tracer_alloc_buffers(void)
{
	int ring_buf_size;
	int ret = -ENOMEM;

	/*
         * Make sure we don't accidently add more trace options
         * than we have bits for.
         */
	BUILD_BUG_ON(TRACE_ITER_LAST_BIT > TRACE_FLAGS_MAX_SIZE);

	if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL))
		goto out;

	if (!alloc_cpumask_var(&global_trace.tracing_cpumask, GFP_KERNEL))
		goto out_free_buffer_mask;

	/* Only allocate trace_printk buffers if a trace_printk exists */
	if (__stop___trace_bprintk_fmt != __start___trace_bprintk_fmt)
		/* Must be called before global_trace.buffer is allocated */
		trace_printk_init_buffers();

	/* To save memory, keep the ring buffer size to its minimum */
	if (ring_buffer_expanded)
		ring_buf_size = trace_buf_size;
	else
		ring_buf_size = 1;

	cpumask_copy(tracing_buffer_mask, cpu_possible_mask);
	cpumask_copy(global_trace.tracing_cpumask, cpu_all_mask);

	raw_spin_lock_init(&global_trace.start_lock);

	/* Used for event triggers */
	temp_buffer = ring_buffer_alloc(PAGE_SIZE, RB_FL_OVERWRITE);
	if (!temp_buffer)
		goto out_free_cpumask;

	if (trace_create_savedcmd() < 0)
		goto out_free_temp_buffer;

	/* TODO: make the number of buffers hot pluggable with CPUS */
	if (allocate_trace_buffers(&global_trace, ring_buf_size) < 0) {
		printk(KERN_ERR "tracer: failed to allocate ring buffer!\n");
		WARN_ON(1);
		goto out_free_savedcmd;
	}

	if (global_trace.buffer_disabled)
		tracing_off();

	if (trace_boot_clock) {
		ret = tracing_set_clock(&global_trace, trace_boot_clock);
		if (ret < 0)
			pr_warn("Trace clock %s not defined, going back to default\n",
				trace_boot_clock);
	}

	/*
         * register_tracer() might reference current_trace, so it
         * needs to be set before we register anything. This is
         * just a bootstrap of current_trace anyway.
         */
	global_trace.current_trace = &nop_trace;

	global_trace.max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;

	ftrace_init_global_array_ops(&global_trace);

	init_trace_flags_index(&global_trace);

	register_tracer(&nop_trace);

	/* All seems OK, enable tracing */
	tracing_disabled = 0;

	atomic_notifier_chain_register(&panic_notifier_list,
				       &trace_panic_notifier);

	register_die_notifier(&trace_die_notifier);

	global_trace.flags = TRACE_ARRAY_FL_GLOBAL;

	INIT_LIST_HEAD(&global_trace.systems);
	INIT_LIST_HEAD(&global_trace.events);
	list_add(&global_trace.list, &ftrace_trace_arrays);

	apply_trace_boot_options();

	register_snapshot_cmd();

	return 0;

out_free_savedcmd:
	free_saved_cmdlines_buffer(savedcmd);
out_free_temp_buffer:
	ring_buffer_free(temp_buffer);
out_free_cpumask:
	free_cpumask_var(global_trace.tracing_cpumask);
out_free_buffer_mask:
	free_cpumask_var(tracing_buffer_mask);
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 232 69.88% 24 75.00%
rusty russell rusty russell 67 20.18% 1 3.12%
yoshihiro yunomae yoshihiro yunomae 18 5.42% 1 3.12%
alexander z lam alexander z lam 6 1.81% 1 3.12%
vaibhav nagarnaik vaibhav nagarnaik 4 1.20% 2 6.25%
jiaxing wang jiaxing wang 2 0.60% 1 3.12%
frederic weisbecker frederic weisbecker 2 0.60% 1 3.12%
joe perches joe perches 1 0.30% 1 3.12%
Total 332 100.00% 32 100.00%



void __init trace_init(void)
{
	if (tracepoint_printk) {
		tracepoint_print_iter =
			kmalloc(sizeof(*tracepoint_print_iter), GFP_KERNEL);
		if (WARN_ON(!tracepoint_print_iter))
			tracepoint_printk = 0;
	}
	tracer_alloc_buffers();
	trace_event_init();
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 45 100.00% 2 100.00%
Total 45 100.00% 2 100.00%



__init static int clear_boot_tracer(void)
{
	/*
         * The default tracer at boot buffer is an init section.
         * This function is called in lateinit. If we did not
         * find the boot tracer, then clear it out, to prevent
         * later registration from accessing the buffer that is
         * about to be freed.
         */
	if (!default_bootup_tracer)
		return 0;

	printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n",
	       default_bootup_tracer);
	default_bootup_tracer = NULL;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%


fs_initcall(tracer_init_tracefs);

late_initcall(clear_boot_tracer);
Overall Contributors
Person Tokens Prop Commits CommitProp
steven rostedt steven rostedt 19067 65.22% 270 50.37%
frederic weisbecker frederic weisbecker 1593 5.45% 32 5.97%
yoshihiro yunomae yoshihiro yunomae 906 3.10% 4 0.75%
vaibhav nagarnaik vaibhav nagarnaik 867 2.97% 7 1.31%
ingo molnar ingo molnar 767 2.62% 21 3.92%
hiraku toyooka hiraku toyooka 606 2.07% 4 0.75%
eduard gabriel munteanu eduard gabriel munteanu 562 1.92% 2 0.37%
jiri olsa jiri olsa 501 1.71% 7 1.31%
lai jiangshan lai jiangshan 432 1.48% 12 2.24%
zhao lei zhao lei 302 1.03% 3 0.56%
tom zanussi tom zanussi 295 1.01% 19 3.54%
li zefan li zefan 294 1.01% 14 2.61%
stanislav fomichev stanislav fomichev 259 0.89% 1 0.19%
oleg nesterov oleg nesterov 249 0.85% 6 1.12%
pekka paalanen pekka paalanen 214 0.73% 4 0.75%
alexander z lam alexander z lam 193 0.66% 6 1.12%
peter zijlstra peter zijlstra 162 0.55% 6 1.12%
jiaxing wang jiaxing wang 125 0.43% 3 0.56%
rusty russell rusty russell 124 0.42% 2 0.37%
arnaldo carvalho de melo arnaldo carvalho de melo 118 0.40% 7 1.31%
masami hiramatsu masami hiramatsu 100 0.34% 2 0.37%
linus torvalds linus torvalds 92 0.31% 2 0.37%
torok edwin torok edwin 90 0.31% 3 0.56%
jens axboe jens axboe 89 0.30% 1 0.19%
avadh patel avadh patel 82 0.28% 1 0.19%
arnd bergmann arnd bergmann 77 0.26% 1 0.19%
tim bird tim bird 75 0.26% 1 0.19%
thomas gleixner thomas gleixner 68 0.23% 7 1.31%
jovi zhangwei jovi zhangwei 68 0.23% 4 0.75%
chunyu hu chunyu hu 62 0.21% 2 0.37%
carsten emde carsten emde 61 0.21% 3 0.56%
david sharp david sharp 59 0.20% 4 0.75%
cody p schafer cody p schafer 59 0.20% 1 0.19%
kosaki motohiro kosaki motohiro 57 0.19% 2 0.37%
soeren sandmann pedersen* soeren sandmann pedersen* 50 0.17% 1 0.19%
jason wessel jason wessel 45 0.15% 1 0.19%
markus metzger markus metzger 42 0.14% 1 0.19%
slava pestov slava pestov 40 0.14% 2 0.37%
david s. miller david s. miller 33 0.11% 1 0.19%
rabin vincent rabin vincent 29 0.10% 2 0.37%
namhyung kim namhyung kim 24 0.08% 5 0.93%
luis claudio r. goncalves luis claudio r. goncalves 23 0.08% 1 0.19%
joe perches joe perches 19 0.06% 1 0.19%
peter huewe peter huewe 17 0.06% 1 0.19%
geyslan g. bem geyslan g. bem 16 0.05% 1 0.19%
mandeep singh baines mandeep singh baines 14 0.05% 1 0.19%
rasmus villemoes rasmus villemoes 14 0.05% 2 0.37%
dan carpenter dan carpenter 14 0.05% 3 0.56%
chen gang chen gang 12 0.04% 2 0.37%
hannes eder hannes eder 12 0.04% 2 0.37%
tejun heo tejun heo 12 0.04% 2 0.37%
sasha levin sasha levin 10 0.03% 1 0.19%
al viro al viro 10 0.03% 4 0.75%
shan wei shan wei 9 0.03% 2 0.37%
eric w. biederman eric w. biederman 9 0.03% 1 0.19%
drew richardson drew richardson 8 0.03% 1 0.19%
julia lawall julia lawall 8 0.03% 1 0.19%
eric dumazet eric dumazet 7 0.02% 1 0.19%
marcin slusarz marcin slusarz 7 0.02% 1 0.19%
andrey vagin andrey vagin 7 0.02% 1 0.19%
vikram mulukutla vikram mulukutla 6 0.02% 1 0.19%
michael ellerman michael ellerman 6 0.02% 1 0.19%
paul e. mckenney paul e. mckenney 5 0.02% 1 0.19%
anton vorontsov anton vorontsov 5 0.02% 1 0.19%
borislav petkov borislav petkov 5 0.02% 1 0.19%
harvey harrison harvey harrison 5 0.02% 1 0.19%
gil fruchter gil fruchter 3 0.01% 2 0.37%
david howells david howells 3 0.01% 1 0.19%
wang tianhong wang tianhong 3 0.01% 1 0.19%
clark williams clark williams 3 0.01% 1 0.19%
fabian frederick fabian frederick 2 0.01% 1 0.19%
heiko carstens heiko carstens 2 0.01% 1 0.19%
abhishek sagar abhishek sagar 2 0.01% 1 0.19%
dmitri vorobiev dmitri vorobiev 2 0.01% 1 0.19%
wang yanqing wang yanqing 2 0.01% 2 0.37%
josh triplett josh triplett 2 0.01% 1 0.19%
christoph lameter christoph lameter 2 0.01% 1 0.19%
roel kluin roel kluin 1 0.00% 1 0.19%
alexey dobriyan alexey dobriyan 1 0.00% 1 0.19%
umesh tiwari umesh tiwari 1 0.00% 1 0.19%
jovi zhang jovi zhang 1 0.00% 1 0.19%
sam ravnborg sam ravnborg 1 0.00% 1 0.19%
ankita garg ankita garg 1 0.00% 1 0.19%
lucas de marchi lucas de marchi 1 0.00% 1 0.19%
james morris james morris 1 0.00% 1 0.19%
daniel walter daniel walter 1 0.00% 1 0.19%
tony luck tony luck 1 0.00% 1 0.19%
frans klaver frans klaver 1 0.00% 1 0.19%
richard weinberger richard weinberger 0.00% 0 0.00%
Total 29235 100.00% 536 100.00%
  Directory: kernel/trace

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
frederic weisbecker	frederic weisbecker	18	78.26%	1	50.00%
steven rostedt	steven rostedt	5	21.74%	1	50.00%
	Total	23	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 kernel/trace/trace.c

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