linux-kernel - Re: [PATCH] slub: Avoid direct compaction if possible

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Date:	Thu, 27 Jun 2013 13:41:20 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Roman Gushchin <klamm@...dex-team.ru>
cc:	Michal Hocko <mhocko@...e.cz>, Christoph Lameter <cl@...two.org>,
	penberg@...nel.org, mpm@...enic.com, akpm@...ux-foundation.org,
	mgorman@...e.de, glommer@...allels.com, hannes@...xchg.org,
	minchan@...nel.org, jiang.liu@...wei.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] slub: Avoid direct compaction if possible

On Thu, 27 Jun 2013, Roman Gushchin wrote:

> > They certainly aren't enough, the kernel you're running suffers from a
> > couple different memory compaction issues that were fixed in 3.7.  I
> > couldn't sympathize with your situation more, I faced the same issue
> > because of thp and not slub (we use slab).
> > 
> > > I'll try to reproduce the issue on raw 3.9.
> > > 
> 
> I can't reproduce the issue on 3.9.
> It seems that compaction fixes in 3.7 solve the problem.
> 

Yeah, we had significant problems with memory compaction in 3.3 and 3.4 
kernels, so if you need to run with such a kernel you'll want to backport 
the listed commits.  I'm not sure we could get such invasive changes into 
a stable release, unfortunately.
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