From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763648AbXGJLF0 (ORCPT ); Tue, 10 Jul 2007 07:05:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758175AbXGJLFO (ORCPT ); Tue, 10 Jul 2007 07:05:14 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:42241 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753308AbXGJLFM (ORCPT ); Tue, 10 Jul 2007 07:05:12 -0400 Subject: Re: -mm merge plans -- anti-fragmentation From: Peter Zijlstra To: Mel Gorman Cc: Andrew Morton , npiggin@suse.de, kenchen@google.com, jschopp@austin.ibm.com, apw@shadowen.org, kamezawa.hiroyu@jp.fujitsu.com, y-goto@jp.fujitsu.com, clameter@sgi.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org In-Reply-To: <20070710102043.GA20303@skynet.ie> References: <20070710102043.GA20303@skynet.ie> Content-Type: text/plain Date: Tue, 10 Jul 2007 13:04:05 +0200 Message-Id: <1184065445.5281.16.camel@lappy> Mime-Version: 1.0 X-Mailer: Evolution 2.10.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2007-07-10 at 11:20 +0100, Mel Gorman wrote: > > lumpy-reclaim-v4.patch > > This patch is really what lumpy reclaim is. I believe Peter has looked > at this and was happy enough at the time although he is cc'd here again > in case this has changed. This is mainly useful with either grouping > pages by mobility or the ZONE_MOVABLE stuff. However, at the time the > patch was proposed, there was a feeling that it might help jumbo frame > allocation on e1000's and maybe if fsblock optimistically uses > contiguous pages it would have an application. I would like to see it go > through to see does it help e1000 at least. I'm not seeing how this will help e1000 (and other jumbo drivers). They typically allocate using GFP_ATOMIC, so in order to satisfy those you'd need to either have a higher order watermark or do atomic defrag of the free space.