linux-kernel - Re: [PATCH 5/5] add NR_ANON

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Message-Id: <20090709161712.23B0.A69D9226@jp.fujitsu.com>
Date:	Thu,  9 Jul 2009 16:20:29 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 5/5] add NR_ANON_PAGES to OOM log

> > On Mon, 6 Jul 2009, Minchan Kim wrote:
> > 
> > > Anyway, I think it's not a big cost in normal system.
> > > So If you want to add new accounting, I don't have any objection. :)
> > 
> > Lets keep the counters to a mininum. If we can calculate the values from
> > something else then there is no justification for a new counter.
> > 
> > A new counter increases the size of the per cpu structures that exist for
> > each zone and each cpu. 1 byte gets multiplies by the number of cpus and
> > that gets multiplied by the number of zones.
> 
> OK. I'll implement this idea.

Grr, sorry I cancel this opinion. Shem pages can't be calculated 
by minchan's formula.

if those page are mlocked, the page move to unevictable lru. then
this calculation don't account mlocked page. However mlocked tmpfs pages
also make OOM issue.



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