linux-kernel - [tip:sched/urgent] sched/cputime: Fix accounting on multi-threaded processes

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Message-ID: <tip-e614b3332a4f3f264a26da28e5a1f4cc3aea3974@git.kernel.org>
Date:	Wed, 10 Apr 2013 02:25:16 -0700
From:	tip-bot for Stanislaw Gruszka <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, fweisbec@...il.com, tglx@...utronix.de,
	oleg@...hat.com, sgruszka@...hat.com
Subject: [tip:sched/urgent] sched/cputime:
  Fix accounting on multi-threaded processes

Commit-ID:  e614b3332a4f3f264a26da28e5a1f4cc3aea3974
Gitweb:     http://git.kernel.org/tip/e614b3332a4f3f264a26da28e5a1f4cc3aea3974
Author:     Stanislaw Gruszka <sgruszka@...hat.com>
AuthorDate: Thu, 4 Apr 2013 10:57:48 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 8 Apr 2013 17:40:52 +0200

sched/cputime: Fix accounting on multi-threaded processes

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

Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20130404085740.GA2495@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/cputime.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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);
--
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