linux-kernel - Re: [PATCH 3/4] mm: memory-failure: Fix isolated page count during memory failure

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Date:	Wed, 8 Jun 2011 12:11:05 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Thomas Sattler <tsattler@....de>,
	Ury Stankevich <urykhy@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] mm: memory-failure: Fix isolated page count during
 memory failure

On Wed 08-06-11 12:07:20, Michal Hocko wrote:
> On Tue 07-06-11 16:07:04, Mel Gorman wrote:
> > From: Minchan Kim <minchan.kim@...il.com>
> > 
> > From: Minchan Kim <minchan.kim@...il.com>
> > 
> > Pages isolated for migration are accounted with the vmstat counters
> > NR_ISOLATE_[ANON|FILE]. Callers of migrate_pages() are expected to
> > increment these counters when pages are isolated from the LRU. Once
> > the pages have been migrated, they are put back on the LRU or freed
> > and the isolated count is decremented.
> 
> Aren't we missing this in compact_zone as well? AFAICS there is no
> accounting done after we isolate pages from LRU? Or am I missing
> something?

Scratch that. It was hidden in acct_isolated which is called from
isolate_migratepages.
It would be really strange if this was broken ;)

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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