From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [RFC] mmaped copy too slow? From: Peter Zijlstra 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 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: KOSAKI Motohiro Cc: Rik van Riel , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton List-ID: 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, 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