perf stat: Poll for monitored tasks being alive (cbb5df7e) · Commits · 戴 / test

Adding the check for tasks we monitor via -p/-t options, and finish stat if there's no longer task to monitor. Requested-by:

Stephane Eranian <eranian@google.com> Signed-off-by:

Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jin Yao <yao.jin@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Tested-by:

Arnaldo Carvalho de Melo <acme@redhat.com> Link: http://lkml.kernel.org/r/20181022093015.9106-1-jolsa@kernel.org Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-stat.c

+24 −0

Original line number	Diff line number	Diff line
		@@ -409,6 +409,28 @@ static struct perf_evsel perf_evsel__reset_weak_group(struct perf_evsel evsel)
		return leader;
		}

		static bool is_target_alive(struct target *_target,
		struct thread_map *threads)
		{
		struct stat st;
		int i;

		if (!target__has_task(_target))
		return true;

		for (i = 0; i < threads->nr; i++) {
		char path[PATH_MAX];

		scnprintf(path, PATH_MAX, "%s/%d", procfs__mountpoint(),
		threads->map[i].pid);

		if (!stat(path, &st))
		return true;
		}

		return false;
		}

		static int __run_perf_stat(int argc, const char **argv, int run_idx)
		{
		int interval = stat_config.interval;
		@@ -579,6 +601,8 @@ try_again:
		enable_counters();
		while (!done) {
		nanosleep(&ts, NULL);
		if (!is_target_alive(&target, evsel_list->threads))
		break;
		if (timeout)
		break;
		if (interval) {

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