Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755088AbYAOI6T (ORCPT ); Tue, 15 Jan 2008 03:58:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752074AbYAOI6J (ORCPT ); Tue, 15 Jan 2008 03:58:09 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:37206 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751425AbYAOI6I (ORCPT ); Tue, 15 Jan 2008 03:58:08 -0500 Subject: Re: [RFC] mmaped copy too slow? From: Peter Zijlstra To: KOSAKI Motohiro Cc: Rik van Riel , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton In-Reply-To: <20080115115318.1191.KOSAKI.MOTOHIRO@jp.fujitsu.com> References: <20080115100450.1180.KOSAKI.MOTOHIRO@jp.fujitsu.com> <20080114211540.284df4fb@bree.surriel.com> <20080115115318.1191.KOSAKI.MOTOHIRO@jp.fujitsu.com> Content-Type: text/plain Date: Tue, 15 Jan 2008 09:57:58 +0100 Message-Id: <1200387478.15103.21.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.21.4 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 779 Lines: 20 On Tue, 2008-01-15 at 12:20 +0900, KOSAKI Motohiro wrote: > Hi Rik > > > While being able to deal with used-once mappings in page reclaim > > could be a good idea, this would require us to be able to determine > > the difference between a page that was accessed once since it was > > faulted in and a page that got accessed several times. > > it makes sense that read ahead hit assume used-once mapping, may be. > I will try it. I once had a patch that made read-ahead give feedback into page reclaim, but people didn't like it. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/