linux-kernel - Re: [3.6 regression?] THP + migration/compaction livelock (I think)

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Message-ID: <CALCETrXSzNEdNEZaQqB93rpP9zXcBD4KRX_bjTAnzU6JEXcApg@mail.gmail.com>
Date:	Tue, 13 Nov 2012 15:45:51 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Marc Duponcheel <marc@...line.be>, Mel Gorman <mgorman@...e.de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [3.6 regression?] THP + migration/compaction livelock (I think)

On Tue, Nov 13, 2012 at 3:41 PM, David Rientjes <rientjes@...gle.com> wrote:
> On Tue, 13 Nov 2012, Andy Lutomirski wrote:
>
>> It just happened again.
>>
>> $ grep -E "compact_|thp_" /proc/vmstat
>> compact_blocks_moved 8332448774
>> compact_pages_moved 21831286
>> compact_pagemigrate_failed 211260
>> compact_stall 13484
>> compact_fail 6717
>> compact_success 6755
>> thp_fault_alloc 150665
>> thp_fault_fallback 4270
>> thp_collapse_alloc 19771
>> thp_collapse_alloc_failed 2188
>> thp_split 19600
>>
>
> Two of the patches from the list provided at
> http://marc.info/?l=linux-mm&m=135179005510688 are already in your 3.6.3
> kernel:
>
>         mm: compaction: abort compaction loop if lock is contended or run too long
>         mm: compaction: acquire the zone->lock as late as possible
>
> and all have not made it to the 3.6 stable kernel yet, so would it be
> possible to try with 3.7-rc5 to see if it fixes the issue?  If so, it will
> indicate that the entire series is a candidate to backport to 3.6.

I'll try later on.  The last time I tried to boot 3.7 on this box, it
failed impressively (presumably due to a localmodconfig bug, but I
haven't tracked it down yet).

I'm also not sure how reliably I can reproduce this.

--Andy


-- 
Andy Lutomirski
AMA Capital Management, LLC
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