linux-kernel - [PATCH] perf: fix counting when initial delay configured

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Date:   Thu, 23 Feb 2023 15:58:00 +0800
From:   Changbin Du <changbin.du@...wei.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
CC:     Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Hui Wang <hw.huiwang@...wei.com>,
        Changbin Du <changbin.du@...wei.com>
Subject: [PATCH] perf: fix counting when initial delay configured

When creating counters with initial delay configured, the enable_on_exec
field is not set. So we need to enable the counters later. The problem
is, when a workload is specified the target__none() is still true. So
we also need to check stat_config.initial_delay.

Before this fix the event is not counted:
$ ./perf stat -e instructions -D 100 sleep 2
Events disabled
Events enabled

 Performance counter stats for 'sleep 2':

     <not counted>      instructions

       1.901661124 seconds time elapsed

       0.001602000 seconds user
       0.000000000 seconds sys

After fix it works:
$ ./perf stat -e instructions -D 100 sleep 2
Events disabled
Events enabled

 Performance counter stats for 'sleep 2':

           404,214      instructions

       1.901743475 seconds time elapsed

       0.001617000 seconds user
       0.000000000 seconds sys

Fixes: c587e77e100f ("perf stat: Do not delay the workload with --delay")
Signed-off-by: Changbin Du <changbin.du@...wei.com>
---
 tools/perf/builtin-stat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 9f3e4b257516..c71d85577de6 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -544,7 +544,7 @@ static int enable_counters(void)
 	 * - we don't have tracee (attaching to task or cpu)
 	 * - we have initial delay configured
 	 */
-	if (!target__none(&target)) {
+	if (!target__none(&target) || stat_config.initial_delay) {
 		if (!all_counters_use_bpf)
 			evlist__enable(evsel_list);
 	}
-- 
2.25.1