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: Namhyung 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2013-03-15 14:58:11 +09:00 committed by Arnaldo Carvalho de Melo
parent da522c1703
commit d723a55096
4 changed files with 129 additions and 0 deletions

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@ -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

View File

@ -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,
},

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@ -0,0 +1,123 @@
#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;
}

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@ -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 */