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

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Date:	Tue, 13 Nov 2012 15:41:02 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andy Lutomirski <luto@...capital.net>
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, 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.
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