From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754265Ab1BJMZg (ORCPT ); Thu, 10 Feb 2011 07:25:36 -0500 Received: from cantor.suse.de ([195.135.220.2]:33819 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755287Ab1BJMZd (ORCPT ); Thu, 10 Feb 2011 07:25:33 -0500 From: stable-bot for Nikhil Rao Date: Thu, 10 Feb 2011 10:23:29 +0100 Subject: [PATCH 27/28] sched: Fix idle balancing To: stable@kernel.org Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar Message-ID: <1297340644.5512.27.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: d5ad140bc1505a98c0f040937125bfcbb508078f upstream Author: Nikhil Rao AuthorDate: Wed Nov 17 11:42:04 2010 -0800 An earlier commit reverts idle balancing throttling reset to fix a 30% regression in volanomark throughput. We still need to reset idle_stamp when we pull a task in newidle balance. Reported-by: Alex Shi Signed-off-by: Nikhil Rao Signed-off-by: Peter Zijlstra LKML-Reference: <1290022924-3548-1-git-send-email-ncrao@google.com> Signed-off-by: Ingo Molnar Signed-off-by: Mike Galbraith Acked-by: Peter Zijlstra --- kernel/sched.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index ffd4f57..f4e1f4e 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -4692,8 +4692,10 @@ static void idle_balance(int this_cpu, struct rq *this_rq) interval = msecs_to_jiffies(sd->balance_interval); if (time_after(next_balance, sd->last_balance + interval)) next_balance = sd->last_balance + interval; - if (pulled_task) + if (pulled_task) { + this_rq->idle_stamp = 0; break; + } } if (pulled_task || time_after(jiffies, this_rq->next_balance)) { /* -- 1.7.4