Commit b31d660d authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

perf tests: Add test to check for event times 



This test creates software event 'cpu-clock' attaches it in several ways
and checks that enabled and running times match.

Committer notes:

Testing it:

  [acme@jouet linux]$ perf test -v times
  44: Test events times                                        :
  --- start ---
  test child forked, pid 27170
  attaching to spawned child, enable on exec
    OK    : ena 307328, run 307328
  attaching to current thread as enabled
    OK    : ena 7826, run 7826
  attaching to current thread as disabled
    OK    : ena 738, run 738
  attaching to CPU 0 as enabled
    SKIP  : not enough rights
  attaching to CPU 0 as enabled
    SKIP  : not enough rights
  test child finished with -2
  ---- end ----
  Test events times: Skip
  [acme@jouet linux]$

  [root@jouet ~]# perf test times
  44: Test events times                                        : Ok
  [root@jouet ~]# perf test -v times
  44: Test events times                                        :
  --- start ---
  test child forked, pid 27306
  attaching to spawned child, enable on exec
    OK    : ena 479290, run 479290
  attaching to current thread as enabled
    OK    : ena 11356, run 11356
  attaching to current thread as disabled
    OK    : ena 987, run 987
  attaching to CPU 0 as enabled
    OK    : ena 3717, run 3717
  attaching to CPU 0 as enabled
    OK    : ena 2323, run 2323
  test child finished with 0
  ---- end ----
  Test events times: Ok
  [root@jouet ~]#

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1458823940-24583-7-git-send-email-jolsa@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent e0be62cc

tools/perf/tests/Build

+1 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ perf-y += topology.o 
perf-y += cpumap.o

perf-y += stat.o

perf-y += event_update.o

perf-y += event-times.o



$(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build

	$(call rule_mkdir)

tools/perf/tests/builtin-test.c

+4 −0
Original line number Diff line number Diff line
@@ -203,6 +203,10 @@ static struct test generic_tests[] = { 
		.desc = "Test attr update synthesize",

		.func = test__event_update,

	},

	{

		.desc = "Test events times",

		.func = test__event_times,

	},

	{

		.func = NULL,

	},

tools/perf/tests/event-times.c

0 → 100644
+236 −0
Original line number Diff line number Diff line 
#include <linux/compiler.h>

#include <string.h>

#include "tests.h"

#include "evlist.h"

#include "evsel.h"

#include "util.h"

#include "debug.h"

#include "thread_map.h"

#include "target.h"



static int attach__enable_on_exec(struct perf_evlist *evlist)

{

	struct perf_evsel *evsel = perf_evlist__last(evlist);

	struct target target = {

		.uid = UINT_MAX,

	};

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

	char sbuf[STRERR_BUFSIZE];

	int err;



	pr_debug("attaching to spawned child, enable on exec\n");



	err = perf_evlist__create_maps(evlist, &target);

	if (err < 0) {

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

		return err;

	}



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

	if (err < 0) {

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

		return err;

	}



	evsel->attr.enable_on_exec = 1;



	err = perf_evlist__open(evlist);

	if (err < 0) {

		pr_debug("perf_evlist__open: %s\n",

			 strerror_r(errno, sbuf, sizeof(sbuf)));

		return err;

	}



	return perf_evlist__start_workload(evlist) == 1 ? TEST_OK : TEST_FAIL;

}



static int detach__enable_on_exec(struct perf_evlist *evlist)

{

	waitpid(evlist->workload.pid, NULL, 0);

	return 0;

}



static int attach__current_disabled(struct perf_evlist *evlist)

{

	struct perf_evsel *evsel = perf_evlist__last(evlist);

	struct thread_map *threads;

	int err;



	pr_debug("attaching to current thread as disabled\n");



	threads = thread_map__new(-1, getpid(), UINT_MAX);

	if (threads == NULL) {

		pr_debug("thread_map__new\n");

		return -1;

	}



	evsel->attr.disabled = 1;



	err = perf_evsel__open_per_thread(evsel, threads);

	if (err) {

		pr_debug("Failed to open event cpu-clock:u\n");

		return err;

	}



	thread_map__put(threads);

	return perf_evsel__enable(evsel) == 0 ? TEST_OK : TEST_FAIL;

}



static int attach__current_enabled(struct perf_evlist *evlist)

{

	struct perf_evsel *evsel = perf_evlist__last(evlist);

	struct thread_map *threads;

	int err;



	pr_debug("attaching to current thread as enabled\n");



	threads = thread_map__new(-1, getpid(), UINT_MAX);

	if (threads == NULL) {

		pr_debug("failed to call thread_map__new\n");

		return -1;

	}



	err = perf_evsel__open_per_thread(evsel, threads);



	thread_map__put(threads);

	return err == 0 ? TEST_OK : TEST_FAIL;

}



static int detach__disable(struct perf_evlist *evlist)

{

	struct perf_evsel *evsel = perf_evlist__last(evlist);



	return perf_evsel__enable(evsel);

}



static int attach__cpu_disabled(struct perf_evlist *evlist)

{

	struct perf_evsel *evsel = perf_evlist__last(evlist);

	struct cpu_map *cpus;

	int err;



	pr_debug("attaching to CPU 0 as enabled\n");



	cpus = cpu_map__new("0");

	if (cpus == NULL) {

		pr_debug("failed to call cpu_map__new\n");

		return -1;

	}



	evsel->attr.disabled = 1;



	err = perf_evsel__open_per_cpu(evsel, cpus);

	if (err) {

		if (err == -EACCES)

			return TEST_SKIP;



		pr_debug("Failed to open event cpu-clock:u\n");

		return err;

	}



	cpu_map__put(cpus);

	return perf_evsel__enable(evsel);

}



static int attach__cpu_enabled(struct perf_evlist *evlist)

{

	struct perf_evsel *evsel = perf_evlist__last(evlist);

	struct cpu_map *cpus;

	int err;



	pr_debug("attaching to CPU 0 as enabled\n");



	cpus = cpu_map__new("0");

	if (cpus == NULL) {

		pr_debug("failed to call cpu_map__new\n");

		return -1;

	}



	err = perf_evsel__open_per_cpu(evsel, cpus);

	if (err == -EACCES)

		return TEST_SKIP;



	cpu_map__put(cpus);

	return err ? TEST_FAIL : TEST_OK;

}



static int test_times(int (attach)(struct perf_evlist *),

		      int (detach)(struct perf_evlist *))

{

	struct perf_counts_values count;

	struct perf_evlist *evlist = NULL;

	struct perf_evsel *evsel;

	int err = -1, i;



	evlist = perf_evlist__new();

	if (!evlist) {

		pr_debug("failed to create event list\n");

		goto out_err;

	}



	err = parse_events(evlist, "cpu-clock:u", NULL);

	if (err) {

		pr_debug("failed to parse event cpu-clock:u\n");

		goto out_err;

	}



	evsel = perf_evlist__last(evlist);

	evsel->attr.read_format |=

		PERF_FORMAT_TOTAL_TIME_ENABLED |

		PERF_FORMAT_TOTAL_TIME_RUNNING;



	err = attach(evlist);

	if (err == TEST_SKIP) {

		pr_debug("  SKIP  : not enough rights\n");

		return err;

	}



	TEST_ASSERT_VAL("failed to attach", !err);



	for (i = 0; i < 100000000; i++) { }



	TEST_ASSERT_VAL("failed to detach", !detach(evlist));



	perf_evsel__read(evsel, 0, 0, &count);



	err = !(count.ena == count.run);



	pr_debug("  %s: ena %" PRIu64", run %" PRIu64"\n",

		 !err ? "OK    " : "FAILED",

		 count.ena, count.run);



out_err:

	if (evlist)

		perf_evlist__delete(evlist);

	return !err ? TEST_OK : TEST_FAIL;

}



/*

 * This test creates software event 'cpu-clock'

 * attaches it in several ways (explained below)

 * and checks that enabled and running times

 * match.

 */

int test__event_times(int subtest __maybe_unused)

{

	int err, ret = 0;



#define _T(attach, detach)			\

	err = test_times(attach, detach);	\

	if (err && (ret == TEST_OK || ret == TEST_SKIP))	\

		ret = err;



	/* attach on newly spawned process after exec */

	_T(attach__enable_on_exec,   detach__enable_on_exec)

	/* attach on current process as enabled */

	_T(attach__current_enabled,  detach__disable)

	/* attach on current process as disabled */

	_T(attach__current_disabled, detach__disable)

	/* attach on cpu as disabled */

	_T(attach__cpu_disabled,     detach__disable)

	/* attach on cpu as enabled */

	_T(attach__cpu_enabled,      detach__disable)



#undef _T

	return ret;

}

tools/perf/tests/tests.h

+1 −0
Original line number Diff line number Diff line
@@ -85,6 +85,7 @@ int test__synthesize_stat_config(int subtest); 
int test__synthesize_stat(int subtest);

int test__synthesize_stat_round(int subtest);

int test__event_update(int subtest);

int test__event_times(int subtest);



#if defined(__arm__) || defined(__aarch64__)

#ifdef HAVE_DWARF_UNWIND_SUPPORT

CRA Git | Maintained and supported by SUSTech CRA and CCSE