From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756371Ab1BJMZi (ORCPT ); Thu, 10 Feb 2011 07:25:38 -0500 Received: from cantor2.suse.de ([195.135.220.15]:37711 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756353Ab1BJMZb (ORCPT ); Thu, 10 Feb 2011 07:25:31 -0500 From: stable-bot for Alex Shi Date: Thu, 10 Feb 2011 10:23:29 +0100 Subject: [PATCH 26/28] sched: Fix volanomark performance regression To: stable@kernel.org Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar Message-ID: <1297340644.5512.26.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.30.1.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit: b5482cfa1c95a188b3054fa33274806add91bbe5 upstream Author: Alex Shi AuthorDate: Tue Nov 16 17:34:02 2010 +0800 Commit fab4762 triggers excessive idle balancing, causing a ~30% loss in volanomark throughput. Remove idle balancing throttle reset. Originally-by: Alex Shi Signed-off-by: Mike Galbraith Acked-by: Nikhil Rao Signed-off-by: Peter Zijlstra LKML-Reference: <1289928732.5169.211.camel@maggy.simson.net> Signed-off-by: Ingo Molnar Signed-off-by: Mike Galbraith Acked-by: Peter Zijlstra --- kernel/sched.c | 4 ---- 1 files changed, 0 insertions(+), 4 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index 445f2d1..ffd4f57 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3326,10 +3326,6 @@ static void pull_task(struct rq *src_rq, struct task_struct *p, set_task_cpu(p, this_cpu); activate_task(this_rq, p, 0); check_preempt_curr(this_rq, p, 0); - - /* re-arm NEWIDLE balancing when moving tasks */ - src_rq->avg_idle = this_rq->avg_idle = 2*sysctl_sched_migration_cost; - this_rq->idle_stamp = 0; } /* -- 1.7.4