Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760766AbZDHHsz (ORCPT ); Wed, 8 Apr 2009 03:48:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761797AbZDHHsn (ORCPT ); Wed, 8 Apr 2009 03:48:43 -0400 Received: from e23smtp09.au.ibm.com ([202.81.31.142]:43906 "EHLO e23smtp09.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761765AbZDHHsl (ORCPT ); Wed, 8 Apr 2009 03:48:41 -0400 Date: Wed, 8 Apr 2009 13:18:09 +0530 From: Balbir Singh To: KAMEZAWA Hiroyuki Cc: "linux-mm@kvack.org" , Andrew Morton , "lizf@cn.fujitsu.com" , Rik van Riel , Bharata B Rao , Dhaval Giani , KOSAKI Motohiro , "linux-kernel@vger.kernel.org" Subject: Re: [RFI] Shared accounting for memory resource controller Message-ID: <20090408074809.GF7082@balbir.in.ibm.com> Reply-To: balbir@linux.vnet.ibm.com References: <20090407071825.GR7082@balbir.in.ibm.com> <20090407163331.8e577170.kamezawa.hiroyu@jp.fujitsu.com> <20090407080355.GS7082@balbir.in.ibm.com> <20090407172419.a5f318b9.kamezawa.hiroyu@jp.fujitsu.com> <20090408052904.GY7082@balbir.in.ibm.com> <20090408151529.fd6626c2.kamezawa.hiroyu@jp.fujitsu.com> <20090408070401.GC7082@balbir.in.ibm.com> <20090408160733.4813cb8d.kamezawa.hiroyu@jp.fujitsu.com> <20090408071115.GD7082@balbir.in.ibm.com> <20090408161824.26f47077.kamezawa.hiroyu@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20090408161824.26f47077.kamezawa.hiroyu@jp.fujitsu.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1975 Lines: 55 * KAMEZAWA Hiroyuki [2009-04-08 16:18:24]: > On Wed, 8 Apr 2009 12:41:15 +0530 > Balbir Singh wrote: > > > * KAMEZAWA Hiroyuki [2009-04-08 16:07:33]: > > 1. First our rss in memory.stat is confusing, we should call it anon > > RSS > ok. but ....changing current interface ? > No, lets just a new field called file_rss and make sure the documentation reflects the correct information. > > 2. We need to add file rss, this is sort of inline with the > > information we export per process file_rss and anon_rss > > maybe good. *but* active/incative ratio in lru file cache is good estimation for this. Active/Inactive tell us about frequently a page is referenced rather than what is mapped and what is not. We could get very bad results if we make an assumption. > > > 3. Using the above, we can then try to (using an algorithm you > > proposed), try to do some work for figuring out the shared percentage. > > > This is the point. At last. Why "# of shared pages" is important ? > I posted this in my motivation yesterday. # of shared pages can help plan the system better and the size of the cgroup. A cgroup might have small usage_in_bytes but large number of shared pages. We need a metric that can help figure out the fair usage of the cgroup. > I wonder it's better to add new stat file as memory.cacheinfo which helps > following kind of commands. > > #cacheinfo /cgroups/memory/group01/ > /usr/lib/libc.so.1 30pages > /var/log/messages 1 pages > /tmp/xxxxxx 20 pages > ..... > ..... > But, what I need at the moment is shared usage information. -- Balbir -- 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/