From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 6C6516B004D for ; Thu, 14 May 2009 19:27:44 -0400 (EDT) Received: from m6.gw.fujitsu.co.jp ([10.0.50.76]) by fgwmail5.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id n4ENS8aK030145 for (envelope-from kosaki.motohiro@jp.fujitsu.com); Fri, 15 May 2009 08:28:08 +0900 Received: from smail (m6 [127.0.0.1]) by outgoing.m6.gw.fujitsu.co.jp (Postfix) with ESMTP id 1C56045DE53 for ; Fri, 15 May 2009 08:28:08 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (s6.gw.fujitsu.co.jp [10.0.50.96]) by m6.gw.fujitsu.co.jp (Postfix) with ESMTP id E456845DE51 for ; Fri, 15 May 2009 08:28:07 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id 39A2B1DB803A for ; Fri, 15 May 2009 08:28:07 +0900 (JST) Received: from m106.s.css.fujitsu.com (m106.s.css.fujitsu.com [10.249.87.106]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id EC8491DB803F for ; Fri, 15 May 2009 08:28:03 +0900 (JST) From: KOSAKI Motohiro Subject: Re: [PATCH -mm] vmscan: protect a fraction of file backed mapped pages from reclaim In-Reply-To: References: <20090513084306.5874.A69D9226@jp.fujitsu.com> Message-Id: <20090515082312.F5B6.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Date: Fri, 15 May 2009 08:28:02 +0900 (JST) Sender: owner-linux-mm@kvack.org To: Christoph Lameter Cc: kosaki.motohiro@jp.fujitsu.com, Wu Fengguang , Andrew Morton , "hannes@cmpxchg.org" , "peterz@infradead.org" , "riel@redhat.com" , "linux-kernel@vger.kernel.org" , "tytso@mit.edu" , "linux-mm@kvack.org" , "elladan@eskimo.com" , "npiggin@suse.de" , "minchan.kim@gmail.com" List-ID: > On Wed, 13 May 2009, KOSAKI Motohiro wrote: > > > > All these expiration modifications do not take into account that a desktop > > > may sit idle for hours while some other things run in the background (like > > > backups at night or updatedb and other maintenance things). This still > > > means that the desktop will be usuable in the morning. > > > > Have you seen this phenomenom? > > I always use linux desktop for development. but I haven't seen it. > > perhaps I have no luck. I really want to know reproduce way. > > > > Please let me know reproduce way. > > Run a backup (or rsync) over a few hundred GB. -ENOTREPRODUCED umm. May I ask detail operation? > > > The percentage of file backed pages protected is set via > > > /proc/sys/vm/file_mapped_ratio. This defaults to 20%. > > > > Why do you think typical mapped ratio is less than 20% on desktop machine? > > Observation of the typical mapped size of Firefox under KDE. My point is, desktop people have very various mapped ratio. Do you oppose this? > > key point is access-once vs access-many. > > Nothing against it if it works. > -- 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