From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 13 Apr 2006 22:25:16 -0700 From: Andrew Morton Subject: Re: [PATCH 2/5] Swapless V2: Add migration swap entries Message-Id: <20060413222516.4cb5885c.akpm@osdl.org> In-Reply-To: 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 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter 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 List-ID: Christoph Lameter wrote: > > 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. So... why does do_migrate_pages() take mmap_sem at all? And the code we're talking about here deals with anonymous pages, which are not shared betweem mm's. -- 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