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Commit d723a550 authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
Browse files

perf test: Add test case for checking number of EXIT events 



The new test__task_exit() test runs a simple "/usr/bin/true" workload and then
checks whether the number of EXIT event is 1 or not.

Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/87obeljax4.fsf@sejong.aot.lge.com


[ committer note: Fixup conflicts with f4c66b4 ( bp overflow tests ) ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent da522c17

tools/perf/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -513,6 +513,7 @@ LIB_OBJS += $(OUTPUT)tests/hists_link.o 
LIB_OBJS += $(OUTPUT)tests/python-use.o

LIB_OBJS += $(OUTPUT)tests/bp_signal.o

LIB_OBJS += $(OUTPUT)tests/bp_signal_overflow.o

LIB_OBJS += $(OUTPUT)tests/task-exit.o



BUILTIN_OBJS += $(OUTPUT)builtin-annotate.o

BUILTIN_OBJS += $(OUTPUT)builtin-bench.o

tools/perf/tests/builtin-test.c

+4 −0
Original line number Diff line number Diff line
@@ -85,6 +85,10 @@ static struct test { 
		.desc = "Test breakpoint overflow sampling",

		.func = test__bp_signal_overflow,

	},

	{

		.desc = "Test number of exit event of a simple workload",

		.func = test__task_exit,

	},

	{

		.func = NULL,

	},

tools/perf/tests/task-exit.c

0 → 100644
+123 −0
Original line number Diff line number Diff line 
#include "evlist.h"

#include "evsel.h"

#include "thread_map.h"

#include "cpumap.h"

#include "tests.h"



#include <signal.h>



static int exited;

static int nr_exit;



static void sig_handler(int sig)

{

	exited = 1;



	if (sig == SIGUSR1)

		nr_exit = -1;

}



/*

 * This test will start a workload that does nothing then it checks

 * if the number of exit event reported by the kernel is 1 or not

 * in order to check the kernel returns correct number of event.

 */

int test__task_exit(void)

{

	int err = -1;

	union perf_event *event;

	struct perf_evsel *evsel;

	struct perf_evlist *evlist;

	struct perf_target target = {

		.uid		= UINT_MAX,

		.uses_mmap	= true,

	};

	const char *argv[] = { "true", NULL };



	signal(SIGCHLD, sig_handler);

	signal(SIGUSR1, sig_handler);



	evlist = perf_evlist__new();

	if (evlist == NULL) {

		pr_debug("perf_evlist__new\n");

		return -1;

	}

	/*

	 * We need at least one evsel in the evlist, use the default

	 * one: "cycles".

	 */

	err = perf_evlist__add_default(evlist);

	if (err < 0) {

		pr_debug("Not enough memory to create evsel\n");

		goto out_free_evlist;

	}



	/*

	 * Create maps of threads and cpus to monitor. In this case

	 * we start with all threads and cpus (-1, -1) but then in

	 * perf_evlist__prepare_workload we'll fill in the only thread

	 * we're monitoring, the one forked there.

	 */

	evlist->cpus = cpu_map__dummy_new();

	evlist->threads = thread_map__new_by_tid(-1);

	if (!evlist->cpus || !evlist->threads) {

		err = -ENOMEM;

		pr_debug("Not enough memory to create thread/cpu maps\n");

		goto out_delete_maps;

	}



	err = perf_evlist__prepare_workload(evlist, &target, argv, false, true);

	if (err < 0) {

		pr_debug("Couldn't run the workload!\n");

		goto out_delete_maps;

	}



	evsel = perf_evlist__first(evlist);

	evsel->attr.task = 1;

	evsel->attr.sample_freq = 0;

	evsel->attr.inherit = 0;

	evsel->attr.watermark = 0;

	evsel->attr.wakeup_events = 1;

	evsel->attr.exclude_kernel = 1;



	err = perf_evlist__open(evlist);

	if (err < 0) {

		pr_debug("Couldn't open the evlist: %s\n", strerror(-err));

		goto out_delete_maps;

	}



	if (perf_evlist__mmap(evlist, 128, true) < 0) {

		pr_debug("failed to mmap events: %d (%s)\n", errno,

			 strerror(errno));

		goto out_close_evlist;

	}



	perf_evlist__start_workload(evlist);



retry:

	while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {

		if (event->header.type != PERF_RECORD_EXIT)

			continue;



		nr_exit++;

	}



	if (!exited || !nr_exit) {

		poll(evlist->pollfd, evlist->nr_fds, -1);

		goto retry;

	}



	if (nr_exit != 1) {

		pr_debug("received %d EXIT records\n", nr_exit);

		err = -1;

	}



	perf_evlist__munmap(evlist);

out_close_evlist:

	perf_evlist__close(evlist);

out_delete_maps:

	perf_evlist__delete_maps(evlist);

out_free_evlist:

	perf_evlist__delete(evlist);

	return err;

}

tools/perf/tests/tests.h

+1 −0
Original line number Diff line number Diff line
@@ -25,5 +25,6 @@ int test__hists_link(void); 
int test__python_use(void);

int test__bp_signal(void);

int test__bp_signal_overflow(void);

int test__task_exit(void);



#endif /* TESTS_H */