From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753450Ab2A2Qfx (ORCPT ); Sun, 29 Jan 2012 11:35:53 -0500 Received: from mail-pz0-f46.google.com ([209.85.210.46]:51132 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753030Ab2A2Qfw (ORCPT ); Sun, 29 Jan 2012 11:35:52 -0500 Subject: [PATCH] sched: At sched_fork use __set_task_cpu(). From: Rakib Mullick To: mingo@elte.hu, a.p.zijlstra@chello.nl Cc: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Date: Sun, 29 Jan 2012 22:34:37 +0600 Message-ID: <1327854877.8504.3.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.32.1 (2.32.1-1.fc14) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We don't use select_task_rq() from sched_fork() anymore and no chance of task gets migrated at this point. Therefore, we can avoid task migration related checking/accounting, so use __set_task_cpu() instead of set_task_cpu(). Signed-off-by: Rakib Mullick --- diff --git a/kernel/sched/core.c b/kernel/sched/core.c index df00cb0..a38026e 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1755,7 +1755,7 @@ void sched_fork(struct task_struct *p) * Silence PROVE_RCU. */ raw_spin_lock_irqsave(&p->pi_lock, flags); - set_task_cpu(p, cpu); + __set_task_cpu(p, cpu); raw_spin_unlock_irqrestore(&p->pi_lock, flags); #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)