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Date: Sun, 17 Jul 2011 10:52:12 +0200
From: Thomas Sattler <tsattler@gmx.de>
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To: Mel Gorman <mgorman@suse.de>
CC: Andrew Morton <akpm@linux-foundation.org>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Minchan Kim <minchan.kim@gmail.com>, Ury Stankevich <urykhy@gmail.com>,
        Andi Kleen <andi@firstfloor.org>, linux-mm <linux-mm@kvack.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/4] Fix compaction stalls due to accounting errors in
 isolated page accounting
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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