Re: [PATCH] slab: optimize constant-size kzalloc calls

From: Pekka J Enberg
Date: Tue Mar 21 2006 - 06:27:57 EST

Pekka Enberg <penberg@xxxxxxxxxxxxxx> wrote:
> > Please note that the patch
> > increases kernel text slightly (~200 bytes for defconfig on x86)

On Tue, 21 Mar 2006, Andrew Morton wrote:
> Why?

Because of the malloc_sizes lookup. As kindly explained by Eric, we're
now doing:

kzalloc(100, GFP_KERNEL);

and with the patch, we will do:

kmem_cache_zalloc(malloc_sizes[4].cs_dmacachep, GFP_KERNEL);

which explains the the difference. The end result should be faster
kzalloc(), though.

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