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authorArjan van de Ven <arjan@intel.linux.com>2006-03-25 10:30:10 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-25 12:10:54 -0500
commita9ba9a3b3897561d01e04cd21433746df46548c0 (patch)
treed222fb0e1c522d4bd506cb8c24c498a7e1589da2 /arch/x86_64/Kconfig
parent4bc32c4d5cde5c57edcc9c2fe5057da8a4dd0153 (diff)
[PATCH] x86_64: prefetch the mmap_sem in the fault path
In a micro-benchmark that stresses the pagefault path, the down_read_trylock on the mmap_sem showed up quite high on the profile. Turns out this lock is bouncing between cpus quite a bit and thus is cache-cold a lot. This patch prefetches the lock (for write) as early as possible (and before some other somewhat expensive operations). With this patch, the down_read_trylock basically fell out of the top of profile. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/Kconfig')
0 files changed, 0 insertions, 0 deletions