Release 4.10 tools/perf/tests/dwarf-unwind.c

#include <linux/compiler.h>
#include <linux/types.h>
#include <unistd.h>
#include "tests.h"
#include "debug.h"
#include "machine.h"
#include "event.h"
#include "unwind.h"
#include "perf_regs.h"
#include "map.h"
#include "thread.h"
#include "callchain.h"

#if defined (__x86_64__) || defined (__i386__) || defined (__powerpc__)
#include "arch-tests.h"
#endif

/* For bsearch. We try to unwind functions in shared object. */
#include <stdlib.h>



static int mmap_handler(struct perf_tool *tool __maybe_unused,
			union perf_event *event,
			struct perf_sample *sample,
			struct machine *machine)
{
	return machine__process_mmap2_event(machine, event, sample);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jiri olsa
jiri olsa
35
94.59%
1
33.33%
don zickus
don zickus
1
2.70%
1
33.33%
arnaldo carvalho de melo
arnaldo carvalho de melo
1
2.70%
1
33.33%
Total
37
100.00%
3
100.00%



static int init_live_machine(struct machine *machine)
{
	union perf_event event;
	pid_t pid = getpid();

	return perf_event__synthesize_mmap_events(NULL, &event, pid, pid,
						  mmap_handler, machine, true, 500);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jiri olsa
jiri olsa
40
95.24%
1
50.00%
kan liang
kan liang
2
4.76%
1
50.00%
Total
42
100.00%
2
100.00%


#define MAX_STACK 8



static int unwind_entry(struct unwind_entry *entry, void *arg)
{
	unsigned long *cnt = (unsigned long *) arg;
	char *symbol = entry->sym ? entry->sym->name : NULL;
	static const char *funcs[MAX_STACK] = {
		"test__arch_unwind_sample",
		"unwind_thread",
		"compare",
		"bsearch",
		"krava_3",
		"krava_2",
		"krava_1",
		"test__dwarf_unwind"
	};
	/*
         * The funcs[MAX_STACK] array index, based on the
         * callchain order setup.
         */
	int idx = callchain_param.order == ORDER_CALLER ?
		  MAX_STACK - *cnt - 1 : *cnt;

	if (*cnt >= MAX_STACK) {
		pr_debug("failed: crossed the max stack value %d\n", MAX_STACK);
		return -1;
	}

	if (!symbol) {
		pr_debug("failed: got unresolved address 0x%" PRIx64 "\n",
			 entry->ip);
		return -1;
	}

	(*cnt)++;
	pr_debug("got: %s 0x%" PRIx64 ", expecting %s\n",
		 symbol, entry->ip, funcs[idx]);
	return strcmp((const char *) symbol, funcs[idx]);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jiri olsa
jiri olsa
168
97.67%
2
66.67%
wang nan
wang nan
4
2.33%
1
33.33%
Total
172
100.00%
3
100.00%

__attribute__ ((noinline))


static int unwind_thread(struct thread *thread)
{
	struct perf_sample sample;
	unsigned long cnt = 0;
	int err = -1;

	memset(&sample, 0, sizeof(sample));

	if (test__arch_unwind_sample(&sample, thread)) {
		pr_debug("failed to get unwind sample\n");
		goto out;
	}

	err = unwind__get_entries(unwind_entry, &cnt, thread,
				  &sample, MAX_STACK);
	if (err)
		pr_debug("unwind failed\n");
	else if (cnt != MAX_STACK) {
		pr_debug("got wrong number of stack entries %lu != %d\n",
			 cnt, MAX_STACK);
		err = -1;
	}

 out:
	free(sample.user_stack.data);
	free(sample.user_regs.regs);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jiri olsa
jiri olsa
132
100.00%
1
100.00%
Total
132
100.00%
1
100.00%


static int global_unwind_retval = -INT_MAX;

__attribute__ ((noinline))


static int compare(void *p1, void *p2)
{
	/* Any possible value should be 'thread' */
	struct thread *thread = *(struct thread **)p1;

	if (global_unwind_retval == -INT_MAX) {
		/* Call unwinder twice for both callchain orders. */
		callchain_param.order = ORDER_CALLER;

		global_unwind_retval = unwind_thread(thread);
		if (!global_unwind_retval) {
			callchain_param.order = ORDER_CALLEE;
			global_unwind_retval = unwind_thread(thread);
		}
	}

	return p1 - p2;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
wang nan
wang nan
48
62.34%
1
50.00%
jiri olsa
jiri olsa
29
37.66%
1
50.00%
Total
77
100.00%
2
100.00%

__attribute__ ((noinline))


static int krava_3(struct thread *thread)
{
	struct thread *array[2] = {thread, thread};
	void *fp = &bsearch;
	/*
         * make _bsearch a volatile function pointer to
         * prevent potential optimization, which may expand
         * bsearch and call compare directly from this function,
         * instead of libc shared object.
         */
	void *(*volatile _bsearch)(void *, void *, size_t,
			size_t, int (*)(void *, void *));

	_bsearch = fp;
	_bsearch(array, &thread, 2, sizeof(struct thread **), compare);
        return global_unwind_retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
wang nan
wang nan
76
84.44%
1
50.00%
jiri olsa
jiri olsa
14
15.56%
1
50.00%
Total
90
100.00%
2
100.00%

__attribute__ ((noinline))


static int krava_2(struct thread *thread)
{
	return krava_3(thread);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jiri olsa
jiri olsa
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%

__attribute__ ((noinline))


static int krava_1(struct thread *thread)
{
	return krava_2(thread);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jiri olsa
jiri olsa
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%



int test__dwarf_unwind(int subtest __maybe_unused)
{
	struct machine *machine;
	struct thread *thread;
	int err = -1;

	machine = machine__new_host();
	if (!machine) {
		pr_err("Could not get machine\n");
		return -1;
	}

	if (machine__create_kernel_maps(machine)) {
		pr_err("Failed to create kernel maps\n");
		return -1;
	}

	callchain_param.record_mode = CALLCHAIN_DWARF;

	if (init_live_machine(machine)) {
		pr_err("Could not init machine\n");
		goto out;
	}

	if (verbose > 1)
		machine__fprintf(machine, stderr);

	thread = machine__find_thread(machine, getpid(), getpid());
	if (!thread) {
		pr_err("Could not get thread\n");
		goto out;
	}

	err = krava_1(thread);
	thread__put(thread);

 out:
	machine__delete_threads(machine);
	machine__delete(machine);
	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
jiri olsa
jiri olsa
141
90.97%
4
57.14%
arnaldo carvalho de melo
arnaldo carvalho de melo
8
5.16%
2
28.57%
namhyung kim
namhyung kim
6
3.87%
1
14.29%
Total
155
100.00%
7
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
jiri olsa
jiri olsa
644
77.50%
5
33.33%
wang nan
wang nan
144
17.33%
1
6.67%
matt fleming
matt fleming
16
1.93%
1
6.67%
namhyung kim
namhyung kim
9
1.08%
1
6.67%
arnaldo carvalho de melo
arnaldo carvalho de melo
9
1.08%
3
20.00%
ravi bangoria
ravi bangoria
5
0.60%
1
6.67%
kan liang
kan liang
2
0.24%
1
6.67%
don zickus
don zickus
1
0.12%
1
6.67%
borislav petkov
borislav petkov
1
0.12%
1
6.67%
Total
831
100.00%
15
100.00%
Directory: tools/perf/tests

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.