From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751807Ab2KXPGc (ORCPT ); Sat, 24 Nov 2012 10:06:32 -0500 Received: from mail-qa0-f53.google.com ([209.85.216.53]:41920 "EHLO mail-qa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751536Ab2KXPGa convert rfc822-to-8bit (ORCPT ); Sat, 24 Nov 2012 10:06:30 -0500 MIME-Version: 1.0 In-Reply-To: <20121122154107.GB11736@localhost> References: <1353433362.85184.YahooMailNeo@web141101.mail.bf1.yahoo.com> <20121120182500.GH1408@quack.suse.cz> <1353485020.53500.YahooMailNeo@web141104.mail.bf1.yahoo.com> <1353485630.17455.YahooMailNeo@web141106.mail.bf1.yahoo.com> <50AC9220.70202@gmail.com> <20121121090204.GA9064@localhost> <50ACA209.9000101@gmail.com> <1353491880.11679.YahooMailNeo@web141102.mail.bf1.yahoo.com> <50ACA634.5000007@gmail.com> <20121122154107.GB11736@localhost> From: =?UTF-8?B?TWV0aW4gRMO2xZ9sw7w=?= Date: Sat, 24 Nov 2012 17:06:09 +0200 Message-ID: Subject: Re: Problem in Page Cache Replacement To: Fengguang Wu Cc: Jaegeuk Hanse , Jan Kara , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 22, 2012 at 5:41 PM, Fengguang Wu wrote: > On Wed, Nov 21, 2012 at 12:07:22PM +0200, Metin Döşlü wrote: >> On Wed, Nov 21, 2012 at 12:00 PM, Jaegeuk Hanse wrote: >> > >> > On 11/21/2012 05:58 PM, metin d wrote: >> > >> > Hi Fengguang, >> > >> > I run tests and attached the results. The line below I guess shows the data-1 page caches. >> > >> > 0x000000080000006c 6584051 25718 __RU_lA___________________P________ referenced,uptodate,lru,active,private >> > >> > >> > I thinks this is just one state of page cache pages. >> >> But why these page caches are in this state as opposed to other page >> caches. From the results I conclude that: >> >> data-1 pages are in state : referenced,uptodate,lru,active,private > > I wonder if it's this code that stops data-1 pages from being > reclaimed: > > shrink_page_list(): > > if (page_has_private(page)) { > if (!try_to_release_page(page, sc->gfp_mask)) > goto activate_locked; > > What's the filesystem used? It was ext3. >> data-2 pages are in state : referenced,uptodate,lru,mappedtodisk > > Thanks, > Fengguang -- Metin Döşlü