From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id 46C4E6B004A for ; Thu, 18 Nov 2010 03:38:56 -0500 (EST) Date: Thu, 18 Nov 2010 09:38:28 +0100 From: Johannes Weiner Subject: Re: [PATCH 0/8] Use memory compaction instead of lumpy reclaim during high-order allocations Message-ID: <20101118083828.GA24635@cmpxchg.org> References: <1290010969-26721-1-git-send-email-mel@csn.ul.ie> <20101117154641.51fd7ce5.akpm@linux-foundation.org> <20101118081254.GB8135@csn.ul.ie> <20101118172627.cf25b83a.kamezawa.hiroyu@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20101118172627.cf25b83a.kamezawa.hiroyu@jp.fujitsu.com> Sender: owner-linux-mm@kvack.org To: KAMEZAWA Hiroyuki Cc: Mel Gorman , Andrew Morton , Andrea Arcangeli , KOSAKI Motohiro , Rik van Riel , linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: On Thu, Nov 18, 2010 at 05:26:27PM +0900, KAMEZAWA Hiroyuki wrote: > On Thu, 18 Nov 2010 08:12:54 +0000 > Mel Gorman wrote: > > > > > I'm hoping that this series also removes the > > > > necessity for the "delete lumpy reclaim" patch from the THP tree. > > > > > > Now I'm sad. I read all that and was thinking "oh goody, we get to > > > delete something for once". But no :( > > > > > > If you can get this stuff to work nicely, why can't we remove lumpy > > > reclaim? > > > > Ultimately we should be able to. Lumpy reclaim is still there for the > > !CONFIG_COMPACTION case and to have an option if we find that compaction > > behaves badly for some reason. > > > > Hmm. CONFIG_COMPACTION depends on CONFIG_MMU. lumpy reclaim will be for NOMMU, > finally ? It's because migration depends on MMU. But we should be able to make a NOMMU version of migration that just does page cache, which is all that is reclaimable on NOMMU anyway. At this point, the MMU dependency can go away, and so can lumpy reclaim. Hannes PS: I'm recovering from a cold, will catch up with the backlog later -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org