Commit 7edc5962 authored by Paul Jackson's avatar Paul Jackson Committed by Linus Torvalds
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[PATCH] cpuset: mark number_of_cpusets read_mostly

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: default avatarPaul Jackson <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 6b9c2603
......@@ -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. */
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