linux-kernel - Re: [PATCH] slob: reduce list scanning

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Message-ID: <469B2E4D.6050404@yahoo.com.au>
Date:	Mon, 16 Jul 2007 18:37:33 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Pekka Enberg <penberg@...helsinki.fi>
CC:	Matt Mackall <mpm@...enic.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, Christoph Lameter <clameter@....com>
Subject: Re: [PATCH] slob: reduce list scanning

Pekka Enberg wrote:
> On 7/16/07, Nick Piggin <nickpiggin@...oo.com.au> wrote:
> 
>> Actually SLOB potentially has some fundamental CPU cache hotness
>> advantages over the other allocators, for the same reasons as
>> its space advantages.
> 
> 
> Because consecutive allocations hit the same cache-hot page regardless
> of requested size where as SLUB by definition distributes allocations
> to different pages (some of which may not be hot)?

Yeah, that, and also a newly freed slab object is quite likely to be
hot, and that memory can be used by another subsequent allocation --
not always, because the allocation heuristics may not place it there,
but there is potential that is impossible with slab allocators.

-- 
SUSE Labs, Novell Inc.
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