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| author | Manfred Spraul <manfred@colorfullife.com> | 2010-05-26 14:43:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 09:12:49 -0700 |
| commit | 31a7c4746e9925512afab30557dd445d677cc802 (patch) | |
| tree | 7f7b39331aa51b77c159b046d406b12aec24de11 /ipc/sem.c | |
| parent | 0a2b9d4c79671b05956806ede5d054e03ae56280 (diff) | |
| download | op-kernel-dev-31a7c4746e9925512afab30557dd445d677cc802.zip op-kernel-dev-31a7c4746e9925512afab30557dd445d677cc802.tar.gz | |
ipc/sem.c: cacheline align the ipc spinlock for semaphores
Cacheline align the spinlock for sysv semaphores. Without the patch, the
spinlock and sem_otime [written by every semop that modified the array]
and sem_base [read in the hot path of try_atomic_semop()] can be in the
same cacheline.
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/sem.c')
0 files changed, 0 insertions, 0 deletions
