linux-kernel - [RFC PATCH 13/16 v3] Intercept wakeup/fork/exec load balancing

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Message-Id: <1401431772-14320-14-git-send-email-yuyang.du@intel.com>
Date:	Fri, 30 May 2014 14:36:09 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	mingo@...hat.com, peterz@...radead.org, rafael.j.wysocki@...el.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:	arjan.van.de.ven@...el.com, len.brown@...el.com,
	alan.cox@...el.com, mark.gross@...el.com, pjt@...gle.com,
	bsegall@...gle.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org, rajeev.d.muralidhar@...el.com,
	vishwesh.m.rudramuni@...el.com, nicole.chalhoub@...el.com,
	ajaya.durg@...el.com, harinarayanan.seshadri@...el.com,
	jacob.jun.pan@...ux.intel.com, fengguang.wu@...el.com,
	yuyang.du@...el.com
Subject: [RFC PATCH 13/16 v3] Intercept wakeup/fork/exec load balancing

We intercept load balancing to contain the load and load balancing in
the consolidated CPUs according to our consolidating mechanism.

In wakeup/fork/exec load balaning, when to find the idlest sched_group,
we first try to find the consolidated group

Signed-off-by: Yuyang Du <yuyang.du@...el.com>
---
 kernel/sched/fair.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index d40ec9e..1c9ac08 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4475,7 +4475,7 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
 	}
 
 	while (sd) {
-		struct sched_group *group;
+		struct sched_group *group = NULL;
 		int weight;
 
 		if (!(sd->flags & sd_flag)) {
@@ -4483,7 +4483,12 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
 			continue;
 		}
 
-		group = find_idlest_group(sd, p, cpu, sd_flag);
+		if (sd->flags & SD_WORKLOAD_CONSOLIDATION)
+			group = wc_find_group(sd, p, cpu);
+
+		if (!group)
+			group = find_idlest_group(sd, p, cpu, sd_flag);
+
 		if (!group) {
 			sd = sd->child;
 			continue;
-- 
1.7.9.5

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