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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: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2016-03-24 13:52:20 +01:00 committed by Arnaldo Carvalho de Melo
parent e0be62cc03
commit b31d660df3
4 changed files with 242 additions and 0 deletions
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1
tools/perf/tests/Build
View File

@ -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)

4
tools/perf/tests/builtin-test.c
View File

@ -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,
},

236
tools/perf/tests/event-times.c Normal file
View File

@ -0,0 +1,236 @@
#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;
}

1
tools/perf/tests/tests.h
View File

@ -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