Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965053AbVJUSRW (ORCPT ); Fri, 21 Oct 2005 14:17:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965071AbVJUSRW (ORCPT ); Fri, 21 Oct 2005 14:17:22 -0400 Received: from omx2-ext.sgi.com ([192.48.171.19]:9122 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S965053AbVJUSRV (ORCPT ); Fri, 21 Oct 2005 14:17:21 -0400 Date: Fri, 21 Oct 2005 11:17:06 -0700 From: Paul Jackson To: Christoph Lameter Cc: kamezawa.hiroyu@jp.fujitsu.com, Simon.Derr@bull.net, akpm@osdl.org, kravetz@us.ibm.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, magnus.damm@gmail.com, marcelo.tosatti@cyclades.com Subject: Re: [PATCH 4/4] Swap migration V3: sys_migrate_pages interface Message-Id: <20051021111706.14ba1569.pj@sgi.com> In-Reply-To: References: <20051020225935.19761.57434.sendpatchset@schroedinger.engr.sgi.com> <20051020225955.19761.53060.sendpatchset@schroedinger.engr.sgi.com> <4358588D.1080307@jp.fujitsu.com> <435896CA.1000101@jp.fujitsu.com> <20051021100357.3397269e.pj@sgi.com> Organization: SGI X-Mailer: Sylpheed version 2.0.0beta5 (GTK+ 2.4.9; 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 Content-Length: 861 Lines: 23 Christoph wrote: > Therefore if mems_allowed is accessed from outside of the > task then it may not be up to date, right? Yup - exactly. The up to date allowed memory container for a task is in its cpuset, which does have the locking mechanisms needed for safe access from other tasks. The task mems_allowed is just a private cache of the mems_allowed of its cpuset, used for quick access from within the task context by the page allocation code. -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson 1.925.600.0401 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/