linux-kernel - [PATCH v3 5/6] Also record sleep start for a task group

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Date:	Wed, 30 May 2012 13:48:36 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	<linux-kernel@...r.kernel.org>
Cc:	<cgroups@...r.kernel.org>, <devel@...nvz.org>,
	Paul Turner <pjt@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Tejun Heo <tj@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, handai.szj@...il.com,
	Andrew.Phillips@...x.com,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Glauber Costa <glommer@...allels.com>
Subject: [PATCH v3 5/6] Also record sleep start for a task group

When we're dealing with a task group, instead of a task, also record
the start of its sleep time. Since the test agains TASK_UNINTERRUPTIBLE
does not really make sense and lack an obvious analogous, we always
record it as sleep_start, never block_start.

Signed-off-by: Glauber Costa <glommer@...allels.com>
CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC: Paul Turner <pjt@...gle.com>
---
 kernel/sched/fair.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c26fe38..d932559 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1182,7 +1182,8 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 				se->statistics.sleep_start = rq_of(cfs_rq)->clock;
 			if (tsk->state & TASK_UNINTERRUPTIBLE)
 				se->statistics.block_start = rq_of(cfs_rq)->clock;
-		}
+		} else
+			se->statistics.sleep_start = rq_of(cfs_rq)->clock;
 #endif
 	}
 
-- 
1.7.10.2

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