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Date:	Wed, 24 Oct 2007 19:43:17 -0700 (PDT)
From:	Christoph Lameter <>
To:	Nick Piggin <>
cc:	Alexey Dobriyan <>, Mel Gorman <>,
	Pekka Enberg <>,,
Subject: Re: SLUB 0:1 SLAB (OOM during massive parallel kernel builds)

On Thu, 25 Oct 2007, Nick Piggin wrote:

> > Ummm... all unreclaimable is set! Are you mlocking the pages in memory? Or
> > what causes this? All pages under writeback? What is the dirty ratio set
> > to?
> Why is SLUB behaving differently, though.

Nore sure. Are we really sure that this does not occur using SLAB?
> Memory efficiency wouldn't be the reason, would it? I mean, SLUB
> should be more efficient than SLAB, plus have less data lying around
> in queues.

SLAB may have data around in queues which (if the stars align the right 
way) may allow it to go longer without having to get a page from the page 
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