From: Benjamin LaHaise <bcrl@linux.intel.com>
Date: Wed, 1 Feb 2006 11:05:30 +0000 (-0800)
Subject: [PATCH] Use 32 bit division in slab_put_obj()
X-Git-Tag: v2.6.16-rc2~110
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9884fd8df195fe48d4e1be2279b419be96127cae;p=pandora-kernel.git

[PATCH] Use 32 bit division in slab_put_obj()

Improve the performance of slab_put_obj().  Without the cast, gcc considers
ptrdiff_t a 64 bit signed integer and ends up emitting code to use a full
signed 128 bit divide on EM64T, which is substantially slower than a 32 bit
unsigned divide.

I noticed this when looking at the profile of a case where the slab balance
is just on edge and thrashes back and forth freeing a block.

Signed-off-by: Benjamin LaHaise <benjamin.c.lahaise@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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