linux-kernel - Re: [patch 21/21] slab defrag: Obsolete SLAB

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Message-ID: <20080510221515.3540a6cc@bree.surriel.com>
Date:	Sat, 10 May 2008 22:15:15 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Christoph Lameter <clameter@....com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Mel Gorman <mel@...net.ie>,
	Pekka Enberg <penberg@...helsinki.fi>, mpm@...enic.com
Subject: Re: [patch 21/21] slab defrag: Obsolete SLAB

On Sat, 10 May 2008 11:53:30 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> Christoph Lameter wrote:
> > Slab defragmentation introduces new functionality not supported by SLAB and
> > SLOB.
> > 
> > Make slab depend on EXPERIMENTAL and note its obsoleteness and that
> > various functionality is not supported by SLAB.
> > 
> > Also update SLOB's description a bit to indicate that certain OS
> > support is limited by design.
> 
> What about the TPC performance regressions? My understanding was that
> slub still performed worse in the "object allocated on one CPU, freed on
> the other CPU" type workloads due to less batching.

Which can be the majority of object allocations and frees in some
workloads.  It definately wants fixing.

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