linux-kernel - [PATCH 3.9 repost] cputime: Fix accounting on multi-threaded processes

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Message-ID: <20130404085740.GA2495@redhat.com>
Date:	Thu, 4 Apr 2013 10:57:48 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3.9 repost] cputime: Fix accounting on multi-threaded
 processes

Recent commit 6fac4829 "cputime: Use accessors to read task cputime
stats" introduced a bug, that make we account many times cputime of
the first thread, instead of cputimes of all threads.

Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
---
This patch fixes 3.8 -> 3.9 regression, please apply.

 kernel/sched/cputime.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index ed12cbb..e93cca9 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -310,7 +310,7 @@ void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
 
 	t = tsk;
 	do {
-		task_cputime(tsk, &utime, &stime);
+		task_cputime(t, &utime, &stime);
 		times->utime += utime;
 		times->stime += stime;
 		times->sum_exec_runtime += task_sched_runtime(t);
-- 
1.7.1

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