linux-kernel - [PATCH 2/4] cgroup: Fix 'usage

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Date:   Wed, 17 Feb 2021 15:00:02 +0300
From:   Andrey Ryabinin <arbn@...dex-team.com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     Boris Burkov <boris@....io>,
        Bharata B Rao <bharata@...ux.vnet.ibm.com>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andrey Ryabinin <arbn@...dex-team.com>, stable@...r.kernel.org
Subject: [PATCH 2/4] cgroup: Fix 'usage_usec' time in root's cpu.stat

Global CPUTIME_USER counter already includes CPUTIME_GUEST
Also CPUTIME_NICE already includes CPUTIME_GUEST_NICE.

Remove additions of CPUTIME_GUEST[_NICE] to total ->sum_exec_runtime
to not account them twice.

Fixes: 936f2a70f207 ("cgroup: add cpu.stat file to root cgroup")
Signed-off-by: Andrey Ryabinin <arbn@...dex-team.com>
Cc: <stable@...r.kernel.org>
---
 kernel/cgroup/rstat.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index d51175cedfca..89ca9b61aa0d 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -421,8 +421,6 @@ static void root_cgroup_cputime(struct task_cputime *cputime)
 		cputime->sum_exec_runtime += user;
 		cputime->sum_exec_runtime += sys;
 		cputime->sum_exec_runtime += cpustat[CPUTIME_STEAL];
-		cputime->sum_exec_runtime += cpustat[CPUTIME_GUEST];
-		cputime->sum_exec_runtime += cpustat[CPUTIME_GUEST_NICE];
 	}
 }
 
-- 
2.26.2