From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755575Ab3AEIhj (ORCPT ); Sat, 5 Jan 2013 03:37:39 -0500 Received: from mga11.intel.com ([192.55.52.93]:44979 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755338Ab3AEIhS (ORCPT ); Sat, 5 Jan 2013 03:37:18 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.84,415,1355126400"; d="scan'208";a="270210070" From: Alex Shi To: mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, akpm@linux-foundation.org, arjan@linux.intel.com, bp@alien8.de, pjt@google.com, namhyung@kernel.org, efault@gmx.de Cc: vincent.guittot@linaro.org, gregkh@linuxfoundation.org, preeti@linux.vnet.ibm.com, linux-kernel@vger.kernel.org, alex.shi@intel.com Subject: [PATCH v3 06/22] sched: load tracking bug fix Date: Sat, 5 Jan 2013 16:37:35 +0800 Message-Id: <1357375071-11793-7-git-send-email-alex.shi@intel.com> X-Mailer: git-send-email 1.7.12 In-Reply-To: <1357375071-11793-1-git-send-email-alex.shi@intel.com> References: <1357375071-11793-1-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 file changed, 2 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 257002c..66c1718 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1558,6 +1558,8 @@ 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)); -- 1.7.12