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authorManfred Spraul <manfred@colorfullife.com>2013-07-08 16:01:23 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-18 07:45:47 -0700
commitab63bc97faaa8e26cef944eda370cf83ca818ca5 (patch)
tree68993c916542750508c50d68bf2db69fd5d909ad /include
parent0824e44c3f0aa0d5dc3d06910a09b9bbaa53d2f6 (diff)
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ipc/sem: separate wait-for-zero and alter tasks into seperate queues
commit 1a82e9e1d0f1b45f47a97c9e2349020536ff8987 upstream. Introduce separate queues for operations that do not modify the semaphore values. Advantages: - Simpler logic in check_restart(). - Faster update_queue(): Right now, all wait-for-zero operations are always tested, even if the semaphore value is not 0. - wait-for-zero gets again priority, as in linux <=3.0.9 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> Cc: Mike Galbraith <efault@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sem.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/sem.h b/include/linux/sem.h
index 53d42650b19..55e17f68d25 100644
--- a/include/linux/sem.h
+++ b/include/linux/sem.h
@@ -15,7 +15,10 @@ struct sem_array {
time_t sem_otime; /* last semop time */
time_t sem_ctime; /* last change time */
struct sem *sem_base; /* ptr to first semaphore in array */
- struct list_head sem_pending; /* pending operations to be processed */
+ struct list_head pending_alter; /* pending operations */
+ /* that alter the array */
+ struct list_head pending_const; /* pending complex operations */
+ /* that do not alter semvals */
struct list_head list_id; /* undo requests on this array */
int sem_nsems; /* no. of semaphores in array */
int complex_count; /* pending complex operations */