linux-kernel - [tip:sched/core] sched: Update rq clock earlier in unthrottle_cfs

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Message-ID: <tip-1a55af2e45cce0ff13bc33c8ee99da84e188b615@git.kernel.org>
Date:	Tue, 28 May 2013 06:11:51 -0700
From:	tip-bot for Frederic Weisbecker <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, efault@....de, pjt@...gle.com,
	zhong@...ux.vnet.ibm.com, fweisbec@...il.com, rostedt@...dmis.org,
	tglx@...utronix.de
Subject: [tip:sched/core] sched:
  Update rq clock earlier in unthrottle_cfs_rq

Commit-ID:  1a55af2e45cce0ff13bc33c8ee99da84e188b615
Gitweb:     http://git.kernel.org/tip/1a55af2e45cce0ff13bc33c8ee99da84e188b615
Author:     Frederic Weisbecker <fweisbec@...il.com>
AuthorDate: Fri, 12 Apr 2013 01:51:01 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 28 May 2013 09:40:25 +0200

sched: Update rq clock earlier in unthrottle_cfs_rq

In this function we are making use of rq->clock right before the
update of the rq clock, let's just call update_rq_clock() just
before that to avoid using a stale rq clock value.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Li Zhong <zhong@...ux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Paul Turner <pjt@...gle.com>
Cc: Mike Galbraith <efault@....de>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1365724262-20142-5-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f76ca21..1c8762a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2319,12 +2319,14 @@ void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
 	se = cfs_rq->tg->se[cpu_of(rq_of(cfs_rq))];
 
 	cfs_rq->throttled = 0;
+
+	update_rq_clock(rq);
+
 	raw_spin_lock(&cfs_b->lock);
 	cfs_b->throttled_time += rq->clock - cfs_rq->throttled_clock;
 	list_del_rcu(&cfs_rq->throttled_list);
 	raw_spin_unlock(&cfs_b->lock);
 
-	update_rq_clock(rq);
 	/* update hierarchical throttle state */
 	walk_tg_tree_from(cfs_rq->tg, tg_nop, tg_unthrottle_up, (void *)rq);
 
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