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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: Paul Jackson <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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