[PATCH] Use 32 bit division in slab_put_obj()

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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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Benjamin LaHaise 2006-02-01 03:05:30 -08:00 • committed by Linus Torvalds

parent c84db23c6e

commit 9884fd8df1

1 changed files with 3 additions and 3 deletions

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mm/slab.c

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