linux-kernel - Re: [patch 09/10] Remove the SLOB allocator for 2.6.23

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Message-ID: <Pine.LNX.4.64.0707090907010.13970@schroedinger.engr.sgi.com>
Date:	Mon, 9 Jul 2007 09:08:10 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, suresh.b.siddha@...el.com,
	corey.d.gough@...el.com, Matt Mackall <mpm@...enic.com>,
	Denis Vlasenko <vda.linux@...glemail.com>,
	Erik Andersen <andersen@...epoet.org>
Subject: Re: [patch 09/10] Remove the SLOB allocator for 2.6.23

On Mon, 9 Jul 2007, Pekka Enberg wrote:

> I assume with "slab external fragmentation" you mean allocating a
> whole page for a slab when there are not enough objects to fill the
> whole thing thus wasting memory? We could try to combat that by
> packing multiple variable-sized slabs within a single page. Also,
> adding some non-power-of-two kmalloc caches might help with internal
> fragmentation.

Ther are already non-power-of-two kmalloc caches for 96 and 192 bytes 
sizes.
> 
> In any case, SLUB needs some serious tuning for smaller machines
> before we can get rid of SLOB.

Switch off CONFIG_SLUB_DEBUG to get memory savings.
 
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