linux-kernel - [tip:sched/core] sched/fair: Remove task and group entity load when they are dead

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Message-ID: <tip-1269557889b477e3e43ab99a21035ddf8f7cea4d@git.kernel.org>
Date:	Mon, 3 Aug 2015 10:11:40 -0700
From:	tip-bot for Yuyang Du <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, efault@....de, yuyang.du@...el.com,
	torvalds@...ux-foundation.org, mingo@...nel.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: [tip:sched/core] sched/fair:
  Remove task and group entity load when they are dead

Commit-ID:  1269557889b477e3e43ab99a21035ddf8f7cea4d
Gitweb:     http://git.kernel.org/tip/1269557889b477e3e43ab99a21035ddf8f7cea4d
Author:     Yuyang Du <yuyang.du@...el.com>
AuthorDate: Wed, 15 Jul 2015 08:04:40 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 3 Aug 2015 12:24:30 +0200

sched/fair: Remove task and group entity load when they are dead

When task exits or group is destroyed, the entity's load should be
removed from its parent cfs_rq's load. Otherwise, it will take time
for the parent cfs_rq to decay the dead entity's load to 0, which
is not desired.

Signed-off-by: Yuyang Du <yuyang.du@...el.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: arjan@...ux.intel.com
Cc: bsegall@...gle.com
Cc: dietmar.eggemann@....com
Cc: fengguang.wu@...el.com
Cc: len.brown@...el.com
Cc: morten.rasmussen@....com
Cc: pjt@...gle.com
Cc: rafael.j.wysocki@...el.com
Cc: umgwanakikbuti@...il.com
Cc: vincent.guittot@...aro.org
Link: http://lkml.kernel.org/r/1436918682-4971-6-git-send-email-yuyang.du@intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f636db0..5532bf3 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4913,6 +4913,11 @@ static void migrate_task_rq_fair(struct task_struct *p, int next_cpu)
 	/* We have migrated, no longer consider this task hot */
 	p->se.exec_start = 0;
 }
+
+static void task_dead_fair(struct task_struct *p)
+{
+	remove_entity_load_avg(&p->se);
+}
 #endif /* CONFIG_SMP */
 
 static unsigned long
@@ -7991,8 +7996,11 @@ void free_fair_sched_group(struct task_group *tg)
 	for_each_possible_cpu(i) {
 		if (tg->cfs_rq)
 			kfree(tg->cfs_rq[i]);
-		if (tg->se)
+		if (tg->se) {
+			if (tg->se[i])
+				remove_entity_load_avg(tg->se[i]);
 			kfree(tg->se[i]);
+		}
 	}
 
 	kfree(tg->cfs_rq);
@@ -8179,6 +8187,7 @@ const struct sched_class fair_sched_class = {
 	.rq_offline		= rq_offline_fair,
 
 	.task_waking		= task_waking_fair,
+	.task_dead		= task_dead_fair,
 #endif
 
 	.set_curr_task          = set_curr_task_fair,
--
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