From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965091AbWDNBbx (ORCPT ); Thu, 13 Apr 2006 21:31:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932090AbWDNBbw (ORCPT ); Thu, 13 Apr 2006 21:31:52 -0400 Received: from omx1-ext.sgi.com ([192.48.179.11]:4498 "EHLO omx1.americas.sgi.com") by vger.kernel.org with ESMTP id S932451AbWDNBbv (ORCPT ); Thu, 13 Apr 2006 21:31:51 -0400 Date: Thu, 13 Apr 2006 18:31:38 -0700 (PDT) From: Christoph Lameter To: Andrew Morton cc: hugh@veritas.com, linux-kernel@vger.kernel.org, lee.schermerhorn@hp.com, linux-mm@kvack.org, taka@valinux.co.jp, marcelo.tosatti@cyclades.com, kamezawa.hiroyu@jp.fujitsu.com Subject: Re: [PATCH 2/5] Swapless V2: Add migration swap entries In-Reply-To: <20060413181716.152493b8.akpm@osdl.org> Message-ID: References: <20060413235406.15398.42233.sendpatchset@schroedinger.engr.sgi.com> <20060413235416.15398.49978.sendpatchset@schroedinger.engr.sgi.com> <20060413171331.1752e21f.akpm@osdl.org> <20060413174232.57d02343.akpm@osdl.org> <20060413180159.0c01beb7.akpm@osdl.org> <20060413181716.152493b8.akpm@osdl.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 13 Apr 2006, Andrew Morton wrote: > Andrew Morton wrote: > > > > Perhaps it would be better to go to > > sleep on some global queue, poke that queue each time a page migration > > completes? > > Or take mmap_sem for writing in do_migrate_pages()? That takes the whole > pagefault path out of the picture. We would have to take that for each task mapping the page. Very expensive operation.