linux-kernel - Re: [PATCH 3/3] mm: slub: Default slub_max

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Date:	Thu, 12 May 2011 13:36:15 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Christoph Lameter <cl@...ux.com>, Dave Jones <davej@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Colin King <colin.king@...onical.com>,
	Raghavendra D Prabhu <raghu.prabhu13@...il.com>,
	Jan Kara <jack@...e.cz>, Chris Mason <chris.mason@...cle.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH 3/3] mm: slub: Default slub_max_order to 0

On Thu, 2011-05-12 at 20:11 +0300, Pekka Enberg wrote:
> On Thu, May 12, 2011 at 8:06 PM, Pekka Enberg <penberg@...nel.org> wrote:
> > On Thu, May 12, 2011 at 7:30 PM, James Bottomley
> > <James.Bottomley@...senpartnership.com> wrote:
> >> So suggest an alternative root cause and a test to expose it.
> >
> > Is your .config available somewhere, btw?
> 
> If it's this:
> 
> http://pkgs.fedoraproject.org/gitweb/?p=kernel.git;a=blob_plain;f=config-x86_64-generic;hb=HEAD
> 
> I'd love to see what happens if you disable
> 
> CONFIG_TRANSPARENT_HUGEPAGE=y
> 
> because that's going to reduce high order allocations as well, no?

So yes, it's a default FC15 config.

Disabling THP was initially tried a long time ago and didn't make a
difference (it was originally suggested by Chris Mason).

James


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