cregit-Linux how code gets into the kernel

Release 4.10 tools/perf/util/python.c

Directory: tools/perf/util
#include <Python.h>
#include <structmember.h>
#include <inttypes.h>
#include <poll.h>
#include <linux/err.h>
#include "evlist.h"
#include "evsel.h"
#include "event.h"
#include "cpumap.h"
#include "thread_map.h"

/*
 * Support debug printing even though util/debug.c is not linked.  That means
 * implementing 'verbose' and 'eprintf'.
 */

int verbose;




int eprintf(int level, int var, const char *fmt, ...)
{
	va_list args;
	int ret = 0;

	if (var >= level) {
		va_start(args, fmt);
		ret = vfprintf(stderr, fmt, args);
		va_end(args);
	}

	return ret;
}


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/* Define PyVarObject_HEAD_INIT for python 2.5 */
#ifndef PyVarObject_HEAD_INIT

# define PyVarObject_HEAD_INIT(type, size) PyObject_HEAD_INIT(type) size,
#endif

PyMODINIT_FUNC initperf(void);


#define member_def(type, member, ptype, help) \
	{ #member, ptype, \
          offsetof(struct pyrf_event, event) + offsetof(struct type, member), \
          0, help }


#define sample_member_def(name, member, ptype, help) \
	{ #name, ptype, \
          offsetof(struct pyrf_event, sample) + offsetof(struct perf_sample, member), \
          0, help }


struct pyrf_event {
	PyObject_HEAD
	
struct perf_evsel *evsel;
	
struct perf_sample sample;
	
union perf_event   event;
};


#define sample_members \
	sample_member_def(sample_ip, ip, T_ULONGLONG, "event type"),                     \
        sample_member_def(sample_pid, pid, T_INT, "event pid"),                  \
        sample_member_def(sample_tid, tid, T_INT, "event tid"),                  \
        sample_member_def(sample_time, time, T_ULONGLONG, "event timestamp"),            \
        sample_member_def(sample_addr, addr, T_ULONGLONG, "event addr"),                 \
        sample_member_def(sample_id, id, T_ULONGLONG, "event id"),                       \
        sample_member_def(sample_stream_id, stream_id, T_ULONGLONG, "event stream id"), \
        sample_member_def(sample_period, period, T_ULONGLONG, "event period"),           \
        sample_member_def(sample_cpu, cpu, T_UINT, "event cpu"),


static char pyrf_mmap_event__doc[] = PyDoc_STR("perf mmap event object.");


static PyMemberDef pyrf_mmap_event__members[] = {
	sample_members
	member_def(perf_event_header, type, T_UINT, "event type"),
	member_def(perf_event_header, misc, T_UINT, "event misc"),
	member_def(mmap_event, pid, T_UINT, "event pid"),
	member_def(mmap_event, tid, T_UINT, "event tid"),
	member_def(mmap_event, start, T_ULONGLONG, "start of the map"),
	member_def(mmap_event, len, T_ULONGLONG, "map length"),
	member_def(mmap_event, pgoff, T_ULONGLONG, "page offset"),
	member_def(mmap_event, filename, T_STRING_INPLACE, "backing store"),
	{ .name = NULL, },
};




static PyObject *pyrf_mmap_event__repr(struct pyrf_event *pevent)
{
	PyObject *ret;
	char *s;

	if (asprintf(&s, "{ type: mmap, pid: %u, tid: %u, start: %#" PRIx64 ", "
			 "length: %#" PRIx64 ", offset: %#" PRIx64 ", "
			 "filename: %s }",
		     pevent->event.mmap.pid, pevent->event.mmap.tid,
		     pevent->event.mmap.start, pevent->event.mmap.len,
		     pevent->event.mmap.pgoff, pevent->event.mmap.filename) < 0) {
		ret = PyErr_NoMemory();
	} else {
		ret = PyString_FromString(s);
		free(s);
	}
	return ret;
}


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static PyTypeObject pyrf_mmap_event__type = {
	PyVarObject_HEAD_INIT(NULL, 0)
	.tp_name	= "perf.mmap_event",
	.tp_basicsize	= sizeof(struct pyrf_event),
	.tp_flags	= Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
	.tp_doc		= pyrf_mmap_event__doc,
	.tp_members	= pyrf_mmap_event__members,
	.tp_repr	= (reprfunc)pyrf_mmap_event__repr,
};


static char pyrf_task_event__doc[] = PyDoc_STR("perf task (fork/exit) event object.");


static PyMemberDef pyrf_task_event__members[] = {
	sample_members
	member_def(perf_event_header, type, T_UINT, "event type"),
	member_def(fork_event, pid, T_UINT, "event pid"),
	member_def(fork_event, ppid, T_UINT, "event ppid"),
	member_def(fork_event, tid, T_UINT, "event tid"),
	member_def(fork_event, ptid, T_UINT, "event ptid"),
	member_def(fork_event, time, T_ULONGLONG, "timestamp"),
	{ .name = NULL, },
};




static PyObject *pyrf_task_event__repr(struct pyrf_event *pevent)
{
	return PyString_FromFormat("{ type: %s, pid: %u, ppid: %u, tid: %u, "
				   "ptid: %u, time: %" PRIu64 "}",
				   pevent->event.header.type == PERF_RECORD_FORK ? "fork" : "exit",
				   pevent->event.fork.pid,
				   pevent->event.fork.ppid,
				   pevent->event.fork.tid,
				   pevent->event.fork.ptid,
				   pevent->event.fork.time);
}


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static PyTypeObject pyrf_task_event__type = {
	PyVarObject_HEAD_INIT(NULL, 0)
	.tp_name	= "perf.task_event",
	.tp_basicsize	= sizeof(struct pyrf_event),
	.tp_flags	= Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
	.tp_doc		= pyrf_task_event__doc,
	.tp_members	= pyrf_task_event__members,
	.tp_repr	= (reprfunc)pyrf_task_event__repr,
};


static char pyrf_comm_event__doc[] = PyDoc_STR("perf comm event object.");


static PyMemberDef pyrf_comm_event__members[] = {
	sample_members
	member_def(perf_event_header, type, T_UINT, "event type"),
	member_def(comm_event, pid, T_UINT, "event pid"),
	member_def(comm_event, tid, T_UINT, "event tid"),
	member_def(comm_event, comm, T_STRING_INPLACE, "process name"),
	{ .name = NULL, },
};




static PyObject *pyrf_comm_event__repr(struct pyrf_event *pevent)
{
	return PyString_FromFormat("{ type: comm, pid: %u, tid: %u, comm: %s }",
				   pevent->event.comm.pid,
				   pevent->event.comm.tid,
				   pevent->event.comm.comm);
}


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static PyTypeObject pyrf_comm_event__type = {
	PyVarObject_HEAD_INIT(NULL, 0)
	.tp_name	= "perf.comm_event",
	.tp_basicsize	= sizeof(struct pyrf_event),
	.tp_flags	= Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
	.tp_doc		= pyrf_comm_event__doc,
	.tp_members	= pyrf_comm_event__members,
	.tp_repr	= (reprfunc)pyrf_comm_event__repr,
};


static char pyrf_throttle_event__doc[] = PyDoc_STR("perf throttle event object.");


static PyMemberDef pyrf_throttle_event__members[] = {
	sample_members
	member_def(perf_event_header, type, T_UINT, "event type"),
	member_def(throttle_event, time, T_ULONGLONG, "timestamp"),
	member_def(throttle_event, id, T_ULONGLONG, "event id"),
	member_def(throttle_event, stream_id, T_ULONGLONG, "event stream id"),
	{ .name = NULL, },
};




static PyObject *pyrf_throttle_event__repr(struct pyrf_event *pevent)
{
	struct throttle_event *te = (struct throttle_event *)(&pevent->event.header + 1);

	return PyString_FromFormat("{ type: %sthrottle, time: %" PRIu64 ", id: %" PRIu64
				   ", stream_id: %" PRIu64 " }",
				   pevent->event.header.type == PERF_RECORD_THROTTLE ? "" : "un",
				   te->time, te->id, te->stream_id);
}


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static PyTypeObject pyrf_throttle_event__type = {
	PyVarObject_HEAD_INIT(NULL, 0)
	.tp_name	= "perf.throttle_event",
	.tp_basicsize	= sizeof(struct pyrf_event),
	.tp_flags	= Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
	.tp_doc		= pyrf_throttle_event__doc,
	.tp_members	= pyrf_throttle_event__members,
	.tp_repr	= (reprfunc)pyrf_throttle_event__repr,
};


static char pyrf_lost_event__doc[] = PyDoc_STR("perf lost event object.");


static PyMemberDef pyrf_lost_event__members[] = {
	sample_members
	member_def(lost_event, id, T_ULONGLONG, "event id"),
	member_def(lost_event, lost, T_ULONGLONG, "number of lost events"),
	{ .name = NULL, },
};




static PyObject *pyrf_lost_event__repr(struct pyrf_event *pevent)
{
	PyObject *ret;
	char *s;

	if (asprintf(&s, "{ type: lost, id: %#" PRIx64 ", "
			 "lost: %#" PRIx64 " }",
		     pevent->event.lost.id, pevent->event.lost.lost) < 0) {
		ret = PyErr_NoMemory();
	} else {
		ret = PyString_FromString(s);
		free(s);
	}
	return ret;
}


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static PyTypeObject pyrf_lost_event__type = {
	PyVarObject_HEAD_INIT(NULL, 0)
	.tp_name	= "perf.lost_event",
	.tp_basicsize	= sizeof(struct pyrf_event),
	.tp_flags	= Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
	.tp_doc		= pyrf_lost_event__doc,
	.tp_members	= pyrf_lost_event__members,
	.tp_repr	= (reprfunc)pyrf_lost_event__repr,
};


static char pyrf_read_event__doc[] = PyDoc_STR("perf read event object.");


static PyMemberDef pyrf_read_event__members[] = {
	sample_members
	member_def(read_event, pid, T_UINT, "event pid"),
	member_def(read_event, tid, T_UINT, "event tid"),
	{ .name = NULL, },
};




static PyObject *pyrf_read_event__repr(struct pyrf_event *pevent)
{
	return PyString_FromFormat("{ type: read, pid: %u, tid: %u }",
				   pevent->event.read.pid,
				   pevent->event.read.tid);
	/*
         * FIXME: return the array of read values,
         * making this method useful ;-)
         */
}


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static PyTypeObject pyrf_read_event__type = {
	PyVarObject_HEAD_INIT(NULL, 0)
	.tp_name	= "perf.read_event",
	.tp_basicsize	= sizeof(struct pyrf_event),
	.tp_flags	= Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
	.tp_doc		= pyrf_read_event__doc,
	.tp_members	= pyrf_read_event__members,
	.tp_repr	= (reprfunc)pyrf_read_event__repr,
};


static char pyrf_sample_event__doc[] = PyDoc_STR("perf sample event object.");


static PyMemberDef pyrf_sample_event__members[] = {
	sample_members
	member_def(perf_event_header, type, T_UINT, "event type"),
	{ .name = NULL, },
};




static PyObject *pyrf_sample_event__repr(struct pyrf_event *pevent)
{
	PyObject *ret;
	char *s;

	if (asprintf(&s, "{ type: sample }") < 0) {
		ret = PyErr_NoMemory();
	} else {
		ret = PyString_FromString(s);
		free(s);
	}
	return ret;
}


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static bool is_tracepoint(struct pyrf_event *pevent)
{
	return pevent->evsel->attr.type == PERF_TYPE_TRACEPOINT;
}


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static PyObject*

tracepoint_field(struct pyrf_event *pe, struct format_field *field)
{
	struct pevent *pevent = field->event->pevent;
	void *data = pe->sample.raw_data;
	PyObject *ret = NULL;
	unsigned long long val;
	unsigned int offset, len;

	if (field->flags & FIELD_IS_ARRAY) {
		offset = field->offset;
		len    = field->size;
		if (field->flags & FIELD_IS_DYNAMIC) {
			val     = pevent_read_number(pevent, data + offset, len);
			offset  = val;
			len     = offset >> 16;
			offset &= 0xffff;
		}
		if (field->flags & FIELD_IS_STRING &&
		    is_printable_array(data + offset, len)) {
			ret = PyString_FromString((char *)data + offset);
		} else {
			ret = PyByteArray_FromStringAndSize((const char *) data + offset, len);
			field->flags &= ~FIELD_IS_STRING;
		}
	} else {
		val = pevent_read_number(pevent, data + field->offset,
					 field->size);
		if (field->flags & FIELD_IS_POINTER)
			ret = PyLong_FromUnsignedLong((unsigned long) val);
		else if (field->flags & FIELD_IS_SIGNED)
			ret = PyLong_FromLong((long) val);
		else
			ret = PyLong_FromUnsignedLong((unsigned long) val);
	}

	return ret;
}


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static PyObject*

get_tracepoint_field(struct pyrf_event *pevent, PyObject *attr_name)
{
	const char *str = PyString_AsString(PyObject_Str(attr_name));
	struct perf_evsel *evsel = pevent->evsel;
	struct format_field *field;

	if (!evsel->tp_format) {
		struct event_format *tp_format;

		tp_format = trace_event__tp_format_id(evsel->attr.config);
		if (!tp_format)
			return NULL;

		evsel->tp_format = tp_format;
	}

	field = pevent_find_any_field(evsel->tp_format, str);
	if (!field)
		return NULL;

	return tracepoint_field(pevent, field);
}


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static PyObject*

pyrf_sample_event__getattro(struct pyrf_event *pevent, PyObject *attr_name)
{
	PyObject *obj = NULL;

	if (is_tracepoint(pevent))
		obj = get_tracepoint_field(pevent, attr_name);

	return obj ?: PyObject_GenericGetAttr((PyObject *) pevent, attr_name);
}


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static PyTypeObject pyrf_sample_event__type = {
	PyVarObject_HEAD_INIT(NULL, 0)
	.tp_name	= "perf.sample_event",
	.tp_basicsize	= sizeof(struct pyrf_event),
	.tp_flags	= Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
	.tp_doc		= pyrf_sample_event__doc,
	.tp_members	= pyrf_sample_event__members,
	.tp_repr	= (reprfunc)pyrf_sample_event__repr,
	.tp_getattro	= (getattrofunc) pyrf_sample_event__getattro,
};


static char pyrf_context_switch_event__doc[] = PyDoc_STR("perf context_switch event object.");


static PyMemberDef pyrf_context_switch_event__members[] = {
	sample_members
	member_def(perf_event_header, type, T_UINT, "event type"),
	member_def(context_switch_event, next_prev_pid, T_UINT, "next/prev pid"),
	member_def(context_switch_event, next_prev_tid, T_UINT, "next/prev tid"),
	{ .name = NULL, },
};




static PyObject *pyrf_context_switch_event__repr(struct pyrf_event *pevent)
{
	PyObject *ret;
	char *s;

	if (asprintf(&s, "{ type: context_switch, next_prev_pid: %u, next_prev_tid: %u, switch_out: %u }",
		     pevent->event.context_switch.next_prev_pid,
		     pevent->event.context_switch.next_prev_tid,
		     !!(pevent->event.header.misc & PERF_RECORD_MISC_SWITCH_OUT)) < 0) {
		ret = PyErr_NoMemory();
	} else {
		ret = PyString_FromString(s);
		free(s);
	}
	return ret;
}


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static PyTypeObject pyrf_context_switch_event__type = {
	PyVarObject_HEAD_INIT(NULL, 0)
	.tp_name	= "perf.context_switch_event",
	.tp_basicsize	= sizeof(struct pyrf_event),
	.tp_flags	= Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
	.tp_doc		= pyrf_context_switch_event__doc,
	.tp_members	= pyrf_context_switch_event__members,
	.tp_repr	= (reprfunc)pyrf_context_switch_event__repr,
};




static int pyrf_event__setup_types(void)
{
	int err;
	pyrf_mmap_event__type.tp_new =
	pyrf_task_event__type.tp_new =
	pyrf_comm_event__type.tp_new =
	pyrf_lost_event__type.tp_new =
	pyrf_read_event__type.tp_new =
	pyrf_sample_event__type.tp_new =
	pyrf_context_switch_event__type.tp_new =
	pyrf_throttle_event__type.tp_new = PyType_GenericNew;
	err = PyType_Ready(&pyrf_mmap_event__type);
	if (err < 0)
		goto out;
	err = PyType_Ready(&pyrf_lost_event__type);
	if (err < 0)
		goto out;
	err = PyType_Ready(&pyrf_task_event__type);
	if (err < 0)
		goto out;
	err = PyType_Ready(&pyrf_comm_event__type);
	if (err < 0)
		goto out;
	err = PyType_Ready(&pyrf_throttle_event__type);
	if (err < 0)
		goto out;
	err = PyType_Ready(&pyrf_read_event__type);
	if (err < 0)
		goto out;
	err = PyType_Ready(&pyrf_sample_event__type);
	if (err < 0)
		goto out;
	err = PyType_Ready(&pyrf_context_switch_event__type);
	if (err < 0)
		goto out;
out:
	return err;
}


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static PyTypeObject *pyrf_event__type[] = {
	[PERF_RECORD_MMAP]	 = &pyrf_mmap_event__type,
	[PERF_RECORD_LOST]	 = &pyrf_lost_event__type,
	[PERF_RECORD_COMM]	 = &pyrf_comm_event__type,
	[PERF_RECORD_EXIT]	 = &pyrf_task_event__type,
	[PERF_RECORD_THROTTLE]	 = &pyrf_throttle_event__type,
	[PERF_RECORD_UNTHROTTLE] = &pyrf_throttle_event__type,
	[PERF_RECORD_FORK]	 = &pyrf_task_event__type,
	[PERF_RECORD_READ]	 = &pyrf_read_event__type,
	[PERF_RECORD_SAMPLE]	 = &pyrf_sample_event__type,
	[PERF_RECORD_SWITCH]	 = &pyrf_context_switch_event__type,
	[PERF_RECORD_SWITCH_CPU_WIDE]  = &pyrf_context_switch_event__type,
};




static PyObject *pyrf_event__new(union perf_event *event)
{
	struct pyrf_event *pevent;
	PyTypeObject *ptype;

	if ((event->header.type < PERF_RECORD_MMAP ||
	     event->header.type > PERF_RECORD_SAMPLE) &&
	    !(event->header.type == PERF_RECORD_SWITCH ||
	      event->header.type == PERF_RECORD_SWITCH_CPU_WIDE))
		return NULL;

	ptype = pyrf_event__type[event->header.type];
	pevent = PyObject_New(struct pyrf_event, ptype);
	if (pevent != NULL)
		memcpy(&pevent->event, event, event->header.size);
	return (PyObject *)pevent;
}


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struct pyrf_cpu_map {
	PyObject_HEAD

	
struct cpu_map *cpus;
};




static int pyrf_cpu_map__init(struct pyrf_cpu_map *pcpus,
			      PyObject *args, PyObject *kwargs)
{
	static char *kwlist[] = { "cpustr", NULL };
	char *cpustr = NULL;

	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|s",
					 kwlist, &cpustr))
		return -1;

	pcpus->cpus = cpu_map__new(cpustr);
	if (pcpus->cpus == NULL)
		return -1;
	return 0;
}


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static void pyrf_cpu_map__delete(struct pyrf_cpu_map *pcpus)
{
	cpu_map__put(pcpus->cpus);
	pcpus->ob_type->tp_free((PyObject*)pcpus);
}


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static Py_ssize_t pyrf_cpu_map__length(PyObject *obj)
{
	struct pyrf_cpu_map *pcpus = (void *)obj;

	return pcpus->cpus->nr;
}


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static PyObject *pyrf_cpu_map__item(PyObject *obj, Py_ssize_t i)
{
	struct pyrf_cpu_map *pcpus = (void *)obj;

	if (i >= pcpus->cpus->nr)
		return NULL;

	return Py_BuildValue("i", pcpus->cpus->map[i]);
}


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static PySequenceMethods pyrf_cpu_map__sequence_methods = {
	.sq_length = pyrf_cpu_map__length,
	.sq_item   = pyrf_cpu_map__item,
};


static char pyrf_cpu_map__doc[] = PyDoc_STR("cpu map object.");


static PyTypeObject pyrf_cpu_map__type = {
	PyVarObject_HEAD_INIT(NULL, 0)
	.tp_name	= "perf.cpu_map",
	.tp_basicsize	= sizeof(struct pyrf_cpu_map),
	.tp_dealloc	= (destructor)pyrf_cpu_map__delete,
	.tp_flags	= Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
	.tp_doc		= pyrf_cpu_map__doc,
	.tp_as_sequence	= &pyrf_cpu_map__sequence_methods,
	.tp_init	= (initproc)pyrf_cpu_map__init,
};




static int pyrf_cpu_map__setup_types(void)
{
	pyrf_cpu_map__type.tp_new = PyType_GenericNew;
	return PyType_Ready(&pyrf_cpu_map__type);
}


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struct pyrf_thread_map {
	PyObject_HEAD

	
struct thread_map *threads;
};




static int pyrf_thread_map__init(struct pyrf_thread_map *pthreads,
				 PyObject *args, PyObject *kwargs)
{
	static char *kwlist[] = { "pid", "tid", "uid", NULL };
	int pid = -1, tid = -1, uid