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[PATCH] cpuset: mark number_of_cpusets read_mostly

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Mark cpuset global 'number_of_cpusets' as __read_mostly.

This global is accessed everytime a zone is considered in the zonelist loops
beneath __alloc_pages, looking for a free memory page.  If number_of_cpusets
is just one, then we can short circuit the mems_allowed check.

Since this global is read alot on a hot path, and written rarely, it is an
excellent candidate for __read_mostly.

Thanks to Christoph Lameter for the suggestion.

Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul Jackson 2006-01-08 01:02:03 -08:00 committed by Linus Torvalds
parent 6b9c2603ce
commit 7edc59628b
1 changed files with 1 additions and 1 deletions
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kernel/cpuset.c
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@ -62,7 +62,7 @@
* When there is only one cpuset (the root cpuset) we can
* short circuit some hooks.
*/
int number_of_cpusets;
int number_of_cpusets __read_mostly;
/* See "Frequency meter" comments, below. */