linux-kernel - [PATCH] sched: Fix task_h

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Message-ID: <1379173186-11944-1-git-send-email-vdavydov@parallels.com>
Date:	Sat, 14 Sep 2013 19:39:46 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
CC:	Alex Shi <alex.shi@...el.com>, <linux-kernel@...r.kernel.org>,
	<devel@...nvz.org>
Subject: [PATCH] sched: Fix task_h_load calculation

Patch a003a2 (sched: Consider runnable load average in move_tasks())
sets all top-level cfs_rqs' h_load to rq->avg.load_avg_contrib, which is
always 0. This mistype leads to all tasks having weight 0 when load
balancing in a cpu-cgroup enabled setup. There obviously should be sum
of weights of all runnable tasks there instead. Fix it.

Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
---
 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 9b3fe1c..13abc29 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4242,7 +4242,7 @@ static void update_cfs_rq_h_load(struct cfs_rq *cfs_rq)
 	}
 
 	if (!se) {
-		cfs_rq->h_load = rq->avg.load_avg_contrib;
+		cfs_rq->h_load = cfs_rq->runnable_load_avg;
 		cfs_rq->last_h_load_update = now;
 	}
 
-- 
1.7.10.4

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