linux-kernel - Re: [PATCH 2/2] SLUB: increase the range of slab sizes available to kmalloc, allowing a somewhat more effient use of memory.

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Message-ID: <0000013a662b9db5-1ea40fb2-3337-4cbc-8eca-5a610564dd75-000000@email.amazonses.com>
Date:	Mon, 15 Oct 2012 20:44:25 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Richard Kennedy <richard@....demon.co.uk>
cc:	Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] SLUB: increase the range of slab sizes available to
 kmalloc, allowing a somewhat more effient use of memory.

On Sat, 13 Oct 2012, Richard Kennedy wrote:

> -extern struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT];
>
> -/*
> - * Sorry that the following has to be that ugly but some versions of GCC
> - * have trouble with constant propagation and loops.
> +static const short __slab_sizes[] = {0, 8, 12, 16, 24, 32, 48, 64, 96,
> +				     128, 192, 256, 384, 512, 768, 1024,
> +				     1536, 2048, 3072, 4096, 6144, 8192};
> +

Urg. No thanks. What is the exact benefit of this patch?
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