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

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Message-ID: <20070710120224.GP11115@waste.org>
Date:	Tue, 10 Jul 2007 07:02:24 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Lameter <clameter@....com>,
	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, 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 Tue, Jul 10, 2007 at 12:31:40PM +0300, Pekka Enberg wrote:
> Hi Nick,
> 
> Pekka J Enberg wrote:
> >> That's 92 KB advantage for SLUB with debugging enabled and 240 KB when
> >> debugging is disabled.
> 
> On 7/10/07, Nick Piggin <nickpiggin@...oo.com.au> wrote:
> >Interesting. What kernel version are you using?
> 
> Linus' git head from yesterday so the results are likely to be
> sensitive to workload and mine doesn't represent real embedded use.

Using 2.6.22-rc6-mm1 with a 64MB lguest and busybox, I'm seeing the
following as the best MemFree numbers after several boots each:

SLAB: 54796
SLOB: 55044
SLUB: 53944
SLUB: 54788 (debug turned off)

These numbers bounce around a lot more from boot to boot than I
remember, so take these numbers with a grain of salt.

Disabling the debug code in the build gives this, by the way:

mm/slub.c: In function ‘init_kmem_cache_node’:
mm/slub.c:1873: error: ‘struct kmem_cache_node’ has no member named
‘full’

-- 
Mathematics is the supreme nostalgia of our time.
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