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

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Message-ID: <28c262360907090327w63b0cdfdn5bc2ad628239e53b@mail.gmail.com>
Date:	Thu, 9 Jul 2009 19:27:52 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	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 Thu, Jul 9, 2009 at 4:20 PM, KOSAKI
Motohiro<kosaki.motohiro@...fujitsu.com> wrote:
>> > 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.

Absolutely. You're right.
But In my opinion,  mlocked shmem pages are important ?
Now we care only number of unevictable pages but don't care what kinds
of pages there are in unevictable list.

What we need is to decode OOM more easily.
I think what kinds of pages there area unevictable lur list is not important.

-- 
Kind regards,
Minchan Kim
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