linux-kernel - Re: [PATCH] Add file based RSS accounting for memory resource controller (v2)

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Message-ID: <20090416043426.GF7082@balbir.in.ibm.com>
Date:	Thu, 16 Apr 2009 10:04:26 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Bharata B Rao <bharata.rao@...il.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Add file based RSS accounting for memory resource
	controller (v2)

* Bharata B Rao <bharata.rao@...il.com> [2009-04-16 09:29:53]:

> On Thu, Apr 16, 2009 at 7:29 AM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> >
> > Feature: Add file RSS tracking per memory cgroup
> >
> > From: Balbir Singh <balbir@...ux.vnet.ibm.com>
> >
> > Changelog v3 -> v2
> > 1. Add corresponding put_cpu() for every get_cpu()
> >
> > Changelog v2 -> v1
> >
> > 1. Rename file_rss to mapped_file
> > 2. Add hooks into mem_cgroup_move_account for updating MAPPED_FILE statistics
> > 3. Use a better name for the statistics routine.
> >
> >
> > We currently don't track file RSS, the RSS we report is actually anon RSS.
> > All the file mapped pages, come in through the page cache and get accounted
> > there. This patch adds support for accounting file RSS pages. It should
> >
> > 1. Help improve the metrics reported by the memory resource controller
> > 2. Will form the basis for a future shared memory accounting heuristic
> >   that has been proposed by Kamezawa.
> >
> > Unfortunately, we cannot rename the existing "rss" keyword used in memory.stat
> > to "anon_rss". We however, add "mapped_file" data and hope to educate the end
> > user through documentation.
> >
> > Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
> 
> Balbir, could you please also update the documentation with the
> description about this new metric ?
>

Yes, I am going to in a follow up patch. I'll send that out after I do
some experimentation with shared memory size heuristics. 

-- 
	Balbir
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