From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with ESMTP id E7D216B003D for ; Sat, 21 Mar 2009 06:04:36 -0400 (EDT) Date: Sat, 21 Mar 2009 11:20:44 +0100 From: Johannes Weiner Subject: Re: [PATCH 0/2] Make the Unevictable LRU available on NOMMU Message-ID: <20090321102044.GA3427@cmpxchg.org> References: <1237565305.27431.48.camel@lts-notebook> <20090312100049.43A3.A69D9226@jp.fujitsu.com> <20090313173343.10169.58053.stgit@warthog.procyon.org.uk> <28c262360903131727l4ef41db5xf917c7c5eb4825a8@mail.gmail.com> <12759.1237566272@redhat.com> <1237573815.27431.122.camel@lts-notebook> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1237573815.27431.122.camel@lts-notebook> Sender: owner-linux-mm@kvack.org To: Lee Schermerhorn Cc: David Howells , Minchan Kim , Andrew Morton , kosaki.motohiro@jp.fujitsu.com, torvalds@linux-foundation.org, peterz@infradead.org, nrik.Berkhan@ge.com, uclinux-dev@uclinux.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, riel@surriel.com List-ID: On Fri, Mar 20, 2009 at 02:30:15PM -0400, Lee Schermerhorn wrote: > On Fri, 2009-03-20 at 16:24 +0000, David Howells wrote: > > Lee Schermerhorn wrote: > > > > > I just want to point out [again :)] that removing the ramfs pages from > > > the lru will prevent them from being migrated > > > > This is less of an issue for NOMMU kernels, since you can't migrate pages that > > are mapped. > > > Agreed. So, you could eliminate them [ramfs pages] from the lru for > just the nommu kernels, if you wanted to go that route. These pages don't come with much overhead anymore when they sit on the unevictable list, right? So I don't see much point in special casing them all over the place. I have a patchset that decouples the unevictable lru feature from mlock, enables the latter on nommu and then makes sure ramfs pages go immediately to the unevictable list so they don't need the scanner to move them. This is just wiring up of features we already have. I will sent this mondayish, need to test it more especially on a NOMMU setup. Hannes -- 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