linux-kernel - Re: [PATCH 0/4] Fix compaction stalls due to accounting errors in isolated page accounting

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Date:	Sun, 17 Jul 2011 10:52:12 +0200
From:	Thomas Sattler <tsattler@....de>
To:	Mel Gorman <mgorman@...e.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	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 0/4] Fix compaction stalls due to accounting errors in
 isolated page accounting

Hi there ...

> Re-verification from testers that these patches really do fix their
> problems would be appreciated. Even if hangs disappear, please confirm
> that the values for nr_isolated_anon and nr_isolated_file in *both*
> /proc/zoneinfo and /proc/vmstat are sensible (i.e. usually zero).

I applied these patches to 2.6.38.8 and it run for nearly a month
without any problems. Even Though I did not check nr_isolated_*.
As (at least) patch3 made it into 2.6.39.3 I did not apply the
others any more. And it occurred again this morning:


  sysload at 2, iowait at 80% on an idle (single core) system


$ grep nr_isolated /proc/zoneinfo /proc/vmstat
/proc/zoneinfo:    nr_isolated_anon 0
/proc/zoneinfo:    nr_isolated_file 1
/proc/zoneinfo:    nr_isolated_anon 0
/proc/zoneinfo:    nr_isolated_file 4294967295
/proc/zoneinfo:    nr_isolated_anon 0
/proc/zoneinfo:    nr_isolated_file 0
/proc/vmstat:nr_isolated_anon 0
/proc/vmstat:nr_isolated_file 0

I captured several SysRq-* logs, in case they're of interest.

Thomas
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