linux/tools/perf/tests/task-exit.c
Arnaldo Carvalho de Melo 602ad878d4 perf target: Shorten perf_target__ to target__
Getting unwieldly long, for this app domain should be descriptive enough
and the use of __ to separate the class from the method names should
help with avoiding clashes with other code bases.

Reported-by: David Ahern <dsahern@gmail.com>
Suggested-by: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20131112113427.GA4053@ghostprotocols.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-11-12 16:51:03 -03:00

114 lines
2.5 KiB
C

#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 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_default();
if (evlist == NULL) {
pr_debug("perf_evlist__new_default\n");
return -1;
}
/*
* 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)
nr_exit++;
perf_evlist__mmap_consume(evlist, 0);
}
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);
perf_evlist__delete(evlist);
return err;
}