Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752368AbbGOH41 (ORCPT ); Wed, 15 Jul 2015 03:56:27 -0400 Received: from mga02.intel.com ([134.134.136.20]:29192 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752288AbbGOH4Z (ORCPT ); Wed, 15 Jul 2015 03:56:25 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,477,1432623600"; d="scan'208";a="729197924" From: Yuyang Du To: mingo@kernel.org, peterz@infradead.org, linux-kernel@vger.kernel.org Cc: pjt@google.com, bsegall@google.com, morten.rasmussen@arm.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, umgwanakikbuti@gmail.com, len.brown@intel.com, rafael.j.wysocki@intel.com, arjan@linux.intel.com, fengguang.wu@intel.com, Yuyang Du Subject: [PATCH v10 5/7] sched: Remove task and group entity load when they are dead Date: Wed, 15 Jul 2015 08:04:40 +0800 Message-Id: <1436918682-4971-6-git-send-email-yuyang.du@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1436918682-4971-1-git-send-email-yuyang.du@intel.com> References: <1436918682-4971-1-git-send-email-yuyang.du@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1594 Lines: 55 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 --- 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 edc404c..19f1199 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4919,6 +4919,11 @@ 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 @@ -8027,8 +8032,11 @@ 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); @@ -8215,6 +8223,7 @@ 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, -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/