Messages in this thread Patch in this message | | | Date | Wed, 14 Dec 2005 00:40:43 -0800 (PST) | From | Paul Jackson <> | Subject | [PATCH 03/04] 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>
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kernel/cpuset.c | 2 +- 1 files changed, 1 insertion(+), 1 deletion(-)
--- 2.6.15-rc3-mm1.orig/kernel/cpuset.c 2005-12-13 18:08:26.644979252 -0800 +++ 2.6.15-rc3-mm1/kernel/cpuset.c 2005-12-13 18:09:55.658647865 -0800 @@ -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. */ -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson <pj@sgi.com> 1.650.933.1373 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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