linux-kernel - [PATCH] perf/core: Update cgroup time with descendants

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Message-Id: <20170914070357.29288-1-linxiulei@gmail.com>
Date:   Thu, 14 Sep 2017 15:03:57 +0800
From:   linxiulei@...il.com
To:     yang_oliver@...mail.com, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        eranian@...il.com, torvalds@...ux-foundation.org, jolsa@...hat.com
Cc:     "leilei.lin" <leilei.lin@...baba-inc.com>
Subject: [PATCH] perf/core: Update cgroup time with descendants

From: "leilei.lin" <leilei.lin@...baba-inc.com>

This fix updating cgroup time when event is being scheduled in
by cgroup descendants

Signed-off-by: leilei.lin <leilei.lin@...baba-inc.com>
---
 kernel/events/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 3e691b7..6f6bd1e 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -662,7 +662,9 @@ static inline void update_cgrp_time_from_event(struct perf_event *event)
 	/*
 	 * Do not update time when cgroup is not active
 	 */
-	if (cgrp == event->cgrp)
+	if (cgrp == event->cgrp ||
+		cgroup_is_descendant(cgrp->css.cgroup,
+			event->cgrp->css.cgroup))
 		__update_cgrp_time(event->cgrp);
 }
 
-- 
2.8.4.31.g9ed660f