linux-kernel - Re: [PATCH mmotm] vmscan move pgdeactivate modification to shrink_active

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Message-ID: <2f11576a0908290832l7ec0c88dl14431e8a2e1d1189@mail.gmail.com>
Date:	Sun, 30 Aug 2009 00:32:36 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH mmotm] vmscan move pgdeactivate modification to 
	shrink_active_list fix

2009/8/29 Johannes Weiner <hannes@...xchg.org>:
> On Sat, Aug 29, 2009 at 07:00:47PM +0900, KOSAKI Motohiro wrote:
>> Hi Hugh
>>
>> 2009/8/29 Hugh Dickins <hugh.dickins@...cali.co.uk>:
>> > mmotm 2009-08-27-16-51 lets the OOM killer loose on my loads even
>> > quicker than last time: one bug fixed but another bug introduced.
>> > vmscan-move-pgdeactivate-modification-to-shrink_active_list.patch
>> > forgot to add NR_LRU_BASE to lru index to make zone_page_state index.
>> >
>> > Signed-off-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
>>
>> Can I use your test case?
>> Currently LRU_BASE is 0. it mean
>>
>> LRU_BASE == NR_INACTIVE_ANON == 0
>> LRU_ACTIVE == NR_ACTIVE_ANON == 1
>
> The zone counters are
>
>        NR_FREE_PAGES = 0
>        NR_INACTIVE_ANON = NR_LRU_BASE = 1
>        NR_ACTIVE_ANON = 2
>        ...,
>
> and NR_LRU_BASE is the offset of the LRU items within the zone stat
> items.  You missed this offset, so accounting to LRU_BASE + 0 *
> LRU_FILE actually accounts to NR_FREE_PAGES, not to NR_INACTIVE_ANON.

/me slapt self. thank you correct me ;)


> I get the feeling we should make this thing more robust...

I agree your perfectly.
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