From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754713AbYADQzn (ORCPT ); Fri, 4 Jan 2008 11:55:43 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753333AbYADQzg (ORCPT ); Fri, 4 Jan 2008 11:55:36 -0500 Received: from mx1.redhat.com ([66.187.233.31]:36843 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753337AbYADQzf (ORCPT ); Fri, 4 Jan 2008 11:55:35 -0500 Date: Fri, 4 Jan 2008 11:55:24 -0500 From: Rik van Riel To: Andi Kleen Cc: Lee Schermerhorn , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Eric Whitney , Nick Dokos Subject: Re: [patch 00/19] VM pageout scalability improvements Message-ID: <20080104115524.7d906f94@bree.surriel.com> In-Reply-To: References: <20080102224144.885671949@redhat.com> <1199379128.5295.21.camel@localhost> <20080103120000.1768f220@cuia.boston.redhat.com> <1199380412.5295.29.camel@localhost> <20080103170035.105d22c8@cuia.boston.redhat.com> <1199463934.5290.20.camel@localhost> Organization: Red Hat, Inc. X-Mailer: Claws Mail 3.0.2 (GTK+ 2.10.4; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 04 Jan 2008 17:34:00 +0100 Andi Kleen wrote: > Lee Schermerhorn writes: > > > We can easily [he says, glibly] reproduce the hang on the anon_vma lock > > Is that a NUMA platform? On non x86? Perhaps you just need queued spinlocks? I really think that the anon_vma and i_mmap_lock spinlock hangs are due to the lack of queued spinlocks. Not because I have seen your system hang, but because I've seen one of Larry's test systems here hang in scary/amusing ways :) With queued spinlocks the system should just slow down, not hang. -- All rights reversed.