linux-kernel - [tip:sched/core] sched/fair: Move load idx selection in find_idlest

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Date:	Wed, 27 Nov 2013 06:10:39 -0800
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,
	peterz@...radead.org, vincent.guittot@...aro.org,
	tglx@...utronix.de
Subject: [tip:sched/core] sched/fair:
  Move load idx selection in find_idlest_group

Commit-ID:  c44f2a020072d75d6b0cbf9f139a09719cda9367
Gitweb:     http://git.kernel.org/tip/c44f2a020072d75d6b0cbf9f139a09719cda9367
Author:     Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate: Fri, 18 Oct 2013 13:52:21 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 27 Nov 2013 13:50:54 +0100

sched/fair: Move load idx selection in find_idlest_group

load_idx is used in find_idlest_group but initialized in select_task_rq_fair
even when not used. The load_idx initialisation is moved in find_idlest_group
and the sd_flag replaces it in the function's args.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Cc: len.brown@...el.com
Cc: amit.kucheria@...aro.org
Cc: pjt@...gle.com
Cc: l.majewski@...sung.com
Cc: Morten.Rasmussen@....com
Cc: cmetcalf@...era.com
Cc: tony.luck@...el.com
Cc: alex.shi@...el.com
Cc: preeti@...ux.vnet.ibm.com
Cc: linaro-kernel@...ts.linaro.org
Cc: rjw@...k.pl
Cc: paulmck@...ux.vnet.ibm.com
Cc: corbet@....net
Cc: arjan@...ux.intel.com
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1382097147-30088-8-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e8b652e..6cb36c7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4110,12 +4110,16 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
  */
 static struct sched_group *
 find_idlest_group(struct sched_domain *sd, struct task_struct *p,
-		  int this_cpu, int load_idx)
+		  int this_cpu, int sd_flag)
 {
 	struct sched_group *idlest = NULL, *group = sd->groups;
 	unsigned long min_load = ULONG_MAX, this_load = 0;
+	int load_idx = sd->forkexec_idx;
 	int imbalance = 100 + (sd->imbalance_pct-100)/2;
 
+	if (sd_flag & SD_BALANCE_WAKE)
+		load_idx = sd->wake_idx;
+
 	do {
 		unsigned long load, avg_load;
 		int local_group;
@@ -4283,7 +4287,6 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
 	}
 
 	while (sd) {
-		int load_idx = sd->forkexec_idx;
 		struct sched_group *group;
 		int weight;
 
@@ -4292,10 +4295,7 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
 			continue;
 		}
 
-		if (sd_flag & SD_BALANCE_WAKE)
-			load_idx = sd->wake_idx;
-
-		group = find_idlest_group(sd, p, cpu, load_idx);
+		group = find_idlest_group(sd, p, cpu, sd_flag);
 		if (!group) {
 			sd = sd->child;
 			continue;
--
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