From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751381AbWIOA00 (ORCPT ); Thu, 14 Sep 2006 20:26:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751382AbWIOA00 (ORCPT ); Thu, 14 Sep 2006 20:26:26 -0400 Received: from smtp.osdl.org ([65.172.181.4]:59039 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1751381AbWIOA0Z (ORCPT ); Thu, 14 Sep 2006 20:26:25 -0400 Date: Thu, 14 Sep 2006 17:26:17 -0700 From: Andrew Morton To: Christoph Lameter Cc: Nick Piggin , "Siddha, Suresh B" , linux-kernel@vger.kernel.org, mingo@elte.hu Subject: Re: [PATCH] Fix longstanding load balancing bug in the scheduler V2 Message-Id: <20060914172617.fc8aef2b.akpm@osdl.org> In-Reply-To: References: <20060908103529.A9121@unix-os.sc.intel.com> <20060908130028.A9446@unix-os.sc.intel.com> <20060908170352.C9446@unix-os.sc.intel.com> <20060911083734.GA25953@wotan.suse.de> X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.6; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 12 Sep 2006 11:37:55 -0700 (PDT) Christoph Lameter wrote: > Fix longstanding load balancing bug in the scheduler V2. > > AFAIK this is an important scheduler bug that needs to go > into 2.6.18 and all stable release since the issue can stall the > scheduler for good. The timing is of course problematic. One approach could be to merge it into 2.6.19-early, backport into 2.6.18.x after a few weeks. I don't know if that's a lot better, really - it's unlikely that anyone will be running serious performance testing against 2.6.19-rc1 or -rc2. I'm struggling to understand how serious this really is - if the bug is "longstanding" then very few machines must be encountering it?