Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765624Ab3DEAFh (ORCPT ); Thu, 4 Apr 2013 20:05:37 -0400 Received: from mail-pd0-f177.google.com ([209.85.192.177]:59161 "EHLO mail-pd0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1765486Ab3DEAFf (ORCPT ); Thu, 4 Apr 2013 20:05:35 -0400 Message-ID: <515E1548.5040801@gmail.com> Date: Fri, 05 Apr 2013 08:05:28 +0800 From: Will Huck User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 MIME-Version: 1.0 To: Rik van Riel CC: Johannes Weiner , Mel Gorman , Linux-MM , Jiri Slaby , Valdis Kletnieks , Zlatko Calusic , dormando , Satoru Moriya , Michal Hocko , LKML Subject: Re: [PATCH 01/10] mm: vmscan: Limit the number of pages kswapd reclaims at each priority References: <1363525456-10448-1-git-send-email-mgorman@suse.de> <1363525456-10448-2-git-send-email-mgorman@suse.de> <20130321155705.GA27848@cmpxchg.org> <514BA04D.2090002@gmail.com> <514BD56F.6050709@redhat.com> <514BD665.5020803@gmail.com> <514BE54C.4050106@gmail.com> <514C5640.8000902@redhat.com> In-Reply-To: <514C5640.8000902@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1772 Lines: 50 Hi Rik, On 03/22/2013 09:01 PM, Rik van Riel wrote: > On 03/22/2013 12:59 AM, Will Huck wrote: >> Hi Rik, >> On 03/22/2013 11:56 AM, Will Huck wrote: >>> Hi Rik, >>> On 03/22/2013 11:52 AM, Rik van Riel wrote: >>>> On 03/21/2013 08:05 PM, Will Huck wrote: >>>> >>>>> One offline question, how to understand this in function >>>>> balance_pgdat: >>>>> /* >>>>> * Do some background aging of the anon list, to give >>>>> * pages a chance to be referenced before reclaiming. >>>>> */ >>>>> age_acitve_anon(zone, &sc); >>>> >>>> The anon lrus use a two-handed clock algorithm. New anonymous pages >>>> start off on the active anon list. Older anonymous pages get moved >>>> to the inactive anon list. >>> >>> The file lrus also use the two-handed clock algorithm, correct? >> >> After reinvestigate the codes, the answer is no. But why have this >> difference? I think you are the expert for this question, expect your >> explanation. :-) > > Anonymous memory has a smaller amount of memory (on the order > of system memory), most of which is or has been in a working > set at some point. > > File system cache tends to have two distinct sets. One part > are the frequently accessed files, another part are the files > that are accessed just once or twice. > > The file working set needs to be protected from streaming > IO. We do this by having new file pages start out on the Is there streaming IO workload or benchmark? > inactive file list, and only promoted to the active file > list if they get accessed twice. > > -- 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/