perf stat: Poll for monitored tasks being alive

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>

1 files changed, 24 insertions, 0 deletions

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index b86aba1c8028..d1028d7755bb 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -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) {