From: Paul Jackson <pj@sgi.com>
Date: Sun, 8 Jan 2006 09:02:03 +0000 (-0800)
Subject: [PATCH] cpuset: mark number_of_cpusets read_mostly
X-Git-Tag: v2.6.16-rc1~816
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7edc59628b2f5d6516b4677b3b56f5f056e45cd9;p=pandora-kernel.git

[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 <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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