linux-kernel - [tip:sched/core] sched: Fix avg

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Date:	Fri, 19 Sep 2014 04:47:41 -0700
From:	tip-bot for Vincent Guittot <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	preeti@...ux.vnet.ibm.com, vincent.guittot@...aro.org,
	tglx@...utronix.de
Subject: [tip:sched/core] sched: Fix avg_load computation

Commit-ID:  65fdac08c264506ff95ee1e34ae066e308c9e6e3
Gitweb:     http://git.kernel.org/tip/65fdac08c264506ff95ee1e34ae066e308c9e6e3
Author:     Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate: Tue, 26 Aug 2014 13:06:46 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 19 Sep 2014 12:35:26 +0200

sched: Fix avg_load computation

The computation of avg_load and avg_load_per_task should only take into
account the number of CFS tasks. The non-CFS tasks are already taken into
account by decreasing the CPU's capacity and they will be tracked in the
CPU's utilization (group_utilization) of the next patches.

Reviewed-by: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: riel@...hat.com
Cc: Morten.Rasmussen@....com
Cc: efault@....de
Cc: nicolas.pitre@...aro.org
Cc: daniel.lezcano@...aro.org
Cc: dietmar.eggemann@....com
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/1409051215-16788-4-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 391eaf2..eb87229 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4095,7 +4095,7 @@ static unsigned long capacity_of(int cpu)
 static unsigned long cpu_avg_load_per_task(int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
-	unsigned long nr_running = ACCESS_ONCE(rq->nr_running);
+	unsigned long nr_running = ACCESS_ONCE(rq->cfs.h_nr_running);
 	unsigned long load_avg = rq->cfs.runnable_load_avg;
 
 	if (nr_running)
@@ -5985,7 +5985,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
 			load = source_load(i, load_idx);
 
 		sgs->group_load += load;
-		sgs->sum_nr_running += rq->nr_running;
+		sgs->sum_nr_running += rq->cfs.h_nr_running;
 
 		if (rq->nr_running > 1)
 			*overload = true;
--
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