linux-kernel - [PATCH] perf stat: Honour --timeout for forked workloads

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Date:   Wed, 15 Apr 2020 12:38:03 -0300
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>
Cc:     Konstantin Kharlamov <hi-angel@...dex.ru>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org
Subject: [PATCH] perf stat: Honour --timeout for forked workloads

Hi guys,

	Please take a look and give this your acks, Tested-by, etc.

Thanks,

- Arnaldo

----

When --timeout is used and a workload is specified to be started by
'perf stat', i.e.

  $ perf stat --timeout 1000 sleep 1h

The --timeout wasn't being honoured, i.e. the workload, 'sleep 1h' in
the above example, should be terminated after 1000ms, but it wasn't,
'perf stat' was waiting for it to finish.

Fix it by sending a SIGTERM when the timeout expires.

Now it works:

  # perf stat -e cycles --timeout 1234 sleep 1h
  sleep: Terminated

   Performance counter stats for 'sleep 1h':

           1,066,692      cycles

         1.234314838 seconds time elapsed

         0.000750000 seconds user
         0.000000000 seconds sys

  #

Reported-by: Konstantin Kharlamov <hi-angel@...dex.ru>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=207243
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-stat.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index ec053dc1e35c..9207b6c45475 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -686,8 +686,11 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
 					break;
 			}
 		}
-		if (child_pid != -1)
+		if (child_pid != -1) {
+			if (timeout)
+				kill(child_pid, SIGTERM);
 			wait4(child_pid, &status, 0, &stat_config.ru_data);
+		}
 
 		if (workload_exec_errno) {
 			const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
-- 
2.25.2