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| author | Paul Jackson <pj@sgi.com> | 2006-01-08 01:02:03 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-08 20:13:45 -0800 |
| commit | 7edc59628b2f5d6516b4677b3b56f5f056e45cd9 (patch) | |
| tree | cc0f07bc07156c6f805a72c39ae2d5655a97fede | |
| parent | 6b9c2603ce07f70de9c7a8d335ecd028e8ff11f3 (diff) | |
| download | linux-7edc59628b2f5d6516b4677b3b56f5f056e45cd9.tar.gz linux-7edc59628b2f5d6516b4677b3b56f5f056e45cd9.tar.bz2 linux-7edc59628b2f5d6516b4677b3b56f5f056e45cd9.zip | |
[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>
| -rw-r--r-- | kernel/cpuset.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 6fe28d6f282b..681a5d58d40d 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -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. */ |