linux-kernel - [PATCH] perf cgroup: fix cgroup for multiple events

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Date:   Thu, 25 Jan 2018 23:00:21 +0800
From:   weiping zhang <zhangweiping@...ichuxing.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
        <namhyung@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
Subject: [PATCH] perf cgroup: fix cgroup for multiple events

if use -G and with multiple events, only the first event has
correct cgroup setting, all other events have a wroung setting.

reproduce:
mkdir -p /sys/fs/cgroup/perf_event/test
perf stat -e cycles -e cache-misses  -a -I 1000 -G test

before:
     1.001007226      <not counted>      cycles                    test
     1.001007226              7,506      cache-misses

after:
     1.000834097      <not counted>      cycles                    test
     1.000834097      <not counted>      cache-misses              test

Signed-off-by: weiping zhang <zhangweiping@...ichuxing.com>
---
 tools/perf/util/cgroup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index d9ffc1e..b50bfd1 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -137,7 +137,8 @@ static int add_cgroup(struct perf_evlist *evlist, char *str)
 
 	return -1;
 found:
-	counter->cgrp = cgrp;
+	evlist__for_each_entry(evlist, counter)
+		counter->cgrp = cgrp;
 	return 0;
 }
 
-- 
2.9.4