linux-kernel - [PATCH] sched: Fix calc_cfs_shares() to consider blocked_load

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Date:	Thu, 28 Feb 2013 15:26:02 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>, Alex Shi <alex.shi@...el.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Namhyung Kim <namhyung.kim@....com>,
	Paul Turner <pjt@...gle.com>
Subject: [PATCH] sched: Fix calc_cfs_shares() to consider blocked_load_avg also

From: Namhyung Kim <namhyung.kim@....com>

The calc_tg_weight() and calc_cfs_shares() used cfs_rq->load.weight
but this is no longer valid for per-entity load tracking since
cfs_rq->tg_load_contrib consists of runnable_load_avg and blocked_
load_avg.  Simply using load.weight here will lose blocked_load_avg
part so will result in an inaccurate share.

Cc: Paul Turner <pjt@...gle.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 kernel/sched/fair.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7a33e5986fc5..add7440bd02f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1032,13 +1032,13 @@ static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq)
 	long tg_weight;
 
 	/*
-	 * Use this CPU's actual weight instead of the last load_contribution
-	 * to gain a more accurate current total weight. See
-	 * update_cfs_rq_load_contribution().
+	 * Use this CPU's actual load instead of the last load_contribution
+	 * to gain a more accurate current total load. See
+	 * __update_cfs_rq_tg_load_contrib().
 	 */
 	tg_weight = atomic64_read(&tg->load_avg);
 	tg_weight -= cfs_rq->tg_load_contrib;
-	tg_weight += cfs_rq->load.weight;
+	tg_weight += cfs_rq->runnable_load_avg + cfs_rq->blocked_load_avg;
 
 	return tg_weight;
 }
@@ -1048,7 +1048,7 @@ static long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg)
 	long tg_weight, load, shares;
 
 	tg_weight = calc_tg_weight(tg, cfs_rq);
-	load = cfs_rq->load.weight;
+	load = cfs_rq->runnable_load_avg + cfs_rq->blocked_load_avg;
 
 	shares = (tg->shares * load);
 	if (tg_weight)
-- 
1.7.11.7

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