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

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Date:	Wed, 14 Nov 2012 02:22:34 +0100
From:	Marc Duponcheel <marc@...line.be>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Marc Duponcheel <marc@...line.be>
Subject: Re: [3.6 regression?] THP + migration/compaction livelock (I think)

 Hi all, please let me know if there is are patches you want me to try.

 FWIW time did not stand still and I run 3.6.6 now.


On 2012 Nov 13, #David Rientjes wrote:
> On Tue, 13 Nov 2012, Andy Lutomirski wrote:
> 
> > >> $ 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.
> > 
> 
> The challenge goes out to Marc too since he reported this issue on 3.6.2 
> but we haven't heard back yet on the success of the backport (although 
> it's probably easier to try 3.7-rc5 since there are some conflicts to 
> resolve).

--
 Marc Duponcheel
 Velodroomstraat 74 - 2600 Berchem - Belgium
 +32 (0)478 68.10.91 - marc@...line.be
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