linux-kernel - [tip:sched/core] sched/fair: Fix the dealing with decay_count in __synchronize_entity

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Date:	Wed, 14 Jan 2015 06:01:30 -0800
From:	tip-bot for Xunlei Pang <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	bsegall@...gle.com, pang.xunlei@...aro.org, peterz@...radead.org,
	torvalds@...ux-foundation.org, mingo@...nel.org, hpa@...or.com
Subject: [tip:sched/core] sched/fair:
  Fix the dealing with decay_count in __synchronize_entity_decay()

Commit-ID:  638476007d13534b2ed4134bf0279ef44071140b
Gitweb:     http://git.kernel.org/tip/638476007d13534b2ed4134bf0279ef44071140b
Author:     Xunlei Pang <pang.xunlei@...aro.org>
AuthorDate: Tue, 16 Dec 2014 23:58:29 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 14 Jan 2015 13:34:13 +0100

sched/fair: Fix the dealing with decay_count in __synchronize_entity_decay()

In __synchronize_entity_decay(), if "decays" happens to be zero,
se->avg.decay_count will not be zeroed, holding the positive value
assigned when dequeued last time.

This is problematic in the following case:
If this runnable task is CFS-balanced to other CPUs soon afterwards,
migrate_task_rq_fair() will treat it as a blocked task due to its
non-zero decay_count, thereby adding its load to cfs_rq->removed_load
wrongly.

Thus, we must zero se->avg.decay_count in this case as well.

Signed-off-by: Xunlei Pang <pang.xunlei@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Ben Segall <bsegall@...gle.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/1418745509-2609-1-git-send-email-pang.xunlei@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 40667cb..97000a9 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2574,11 +2574,11 @@ static inline u64 __synchronize_entity_decay(struct sched_entity *se)
 	u64 decays = atomic64_read(&cfs_rq->decay_counter);
 
 	decays -= se->avg.decay_count;
+	se->avg.decay_count = 0;
 	if (!decays)
 		return 0;
 
 	se->avg.load_avg_contrib = decay_load(se->avg.load_avg_contrib, decays);
-	se->avg.decay_count = 0;
 
 	return decays;
 }
--
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