From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752917Ab2LJI31 (ORCPT ); Mon, 10 Dec 2012 03:29:27 -0500 Received: from mga14.intel.com ([143.182.124.37]:14834 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752735Ab2LJI0P (ORCPT ); Mon, 10 Dec 2012 03:26:15 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.84,250,1355126400"; d="scan'208";a="178808709" From: Alex Shi To: rob@landley.net, mingo@redhat.com, peterz@infradead.org Cc: gregkh@linuxfoundation.org, andre.przywara@amd.com, rjw@sisk.pl, paul.gortmaker@windriver.com, akpm@linux-foundation.org, paulmck@linux.vnet.ibm.com, linux-kernel@vger.kernel.org, pjt@google.com, vincent.guittot@linaro.org Subject: [PATCH 05/18] sched: load tracking bug fix Date: Mon, 10 Dec 2012 16:22:21 +0800 Message-Id: <1355127754-8444-6-git-send-email-alex.shi@intel.com> X-Mailer: git-send-email 1.7.12 In-Reply-To: <1355127754-8444-1-git-send-email-alex.shi@intel.com> References: <1355127754-8444-1-git-send-email-alex.shi@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We need initialize the se.avg.{decay_count, load_avg_contrib} to zero after a new task forked. Otherwise random values of above variable cause mess when do new task enqueue: enqueue_task_fair enqueue_entity enqueue_entity_load_avg Signed-off-by: Alex Shi --- kernel/sched/core.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 5dae0d2..e6533e1 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1534,6 +1534,8 @@ static void __sched_fork(struct task_struct *p) #if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED) p->se.avg.runnable_avg_period = 0; p->se.avg.runnable_avg_sum = 0; + p->se.avg.decay_count = 0; + p->se.avg.load_avg_contrib = 0; #endif #ifdef CONFIG_SCHEDSTATS memset(&p->se.statistics, 0, sizeof(p->se.statistics)); -- 1.7.5.1