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authorManfred Spraul <manfred@colorfullife.com>2013-07-08 16:01:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-09 10:33:28 -0700
commitd12e1e50e47e0900dbbf52237b7e171f4f15ea1e (patch)
tree83b54585a883ee062353eb464d93944d08ab4a1c /block/ioctl.c
parentf269f40ad5aeee229ed70044926f44318abe41ef (diff)
downloadlinux-d12e1e50e47e0900dbbf52237b7e171f4f15ea1e.tar.bz2
ipc/sem.c: replace shared sem_otime with per-semaphore value
sem_otime contains the time of the last semaphore operation that completed successfully. Every operation updates this value, thus access from multiple cpus can cause thrashing. Therefore the patch replaces the variable with a per-semaphore variable. The per-array sem_otime is only calculated when required. No performance improvement on a single-socket i3 - only important for larger systems. Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Cc: Rik van Riel <riel@redhat.com> Cc: Davidlohr Bueso <davidlohr.bueso@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block/ioctl.c')
0 files changed, 0 insertions, 0 deletions