From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with SMTP id 407DD6B01EE for ; Tue, 30 Mar 2010 21:36:50 -0400 (EDT) Received: by yxe3 with SMTP id 3so425945yxe.1 for ; Tue, 30 Mar 2010 18:36:48 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: <1269874629-1736-1-git-send-email-lliubbo@gmail.com> <28c262361003291703i5382e342q773ffb16e3324cf5@mail.gmail.com> Date: Wed, 31 Mar 2010 09:36:47 +0800 Message-ID: Subject: Re: [RFC][PATCH] migrate_pages:skip migration between intersect nodes From: Bob Liu Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org To: Christoph Lameter Cc: Minchan Kim , akpm@linux-foundation.org, linux-mm@kvack.org, lee.schermerhorn@hp.com, andi@firstfloor.org, kosaki.motohiro@jp.fujitsu.com List-ID: On 3/31/10, Christoph Lameter wrote: > On Tue, 30 Mar 2010, Minchan Kim wrote: > >> Hi, Bob >> >> On Mon, Mar 29, 2010 at 11:57 PM, Bob Liu wrote: >> > In current do_migrate_pages(),if from_nodes and to_nodes have some >> > intersect nodes,pages in these intersect nodes will also be >> > migrated. >> > eg. Assume that, from_nodes: 1,2,3,4 to_nodes: 2,3,4,5. Then these >> > migrates will happen: >> > migrate_pages(4,5); >> > migrate_pages(3,4); >> > migrate_pages(2,3); >> > migrate_pages(1,2); >> > >> > But the user just want all pages in from_nodes move to to_nodes, >> > only migrate(1,2)(ignore the intersect nodes.) can satisfied >> > the user's request. >> > >> > I amn't sure what's migrate_page's semantic. >> > Hoping for your suggestions. >> >> I didn't see 8:migratepages Lee pointed at that time. >> The description matches current migrate_pages's behavior exactly. >> >> I agree Lee's opinion. >> Let's wait Christoph's reply what is semantic >> and why it doesn't have man page. > > Manpage is part of numatools. > > The intended semantic is the preservation of the relative position of the > page to the beginning of the node set. If you do not want to preserve the > relative position then just move portions of the nodes around. > Hmm., Sorry I still haven't understand your mention :-) My concern was why move the pages in the intersect nodes.I think skipping this migration we can also satisfy the user's request. In the above semantic, I haven't got the result. Thanks! -- Regards, -Bob -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org