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author | Manfred Spraul <manfred@colorfullife.com> | 2013-07-08 16:01:24 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-09 10:33:28 -0700 |
commit | f269f40ad5aeee229ed70044926f44318abe41ef (patch) | |
tree | 878fd6dabbf34c154809ed21f6d64cb90c7e394c /Documentation/svga.txt | |
parent | 1a82e9e1d0f1b45f47a97c9e2349020536ff8987 (diff) | |
download | kernel_goldelico_gta04-f269f40ad5aeee229ed70044926f44318abe41ef.zip kernel_goldelico_gta04-f269f40ad5aeee229ed70044926f44318abe41ef.tar.gz kernel_goldelico_gta04-f269f40ad5aeee229ed70044926f44318abe41ef.tar.bz2 |
ipc/sem.c: always use only one queue for alter operations
There are two places that can contain alter operations:
- the global queue: sma->pending_alter
- the per-semaphore queues: sma->sem_base[].pending_alter.
Since one of the queues must be processed first, this causes an odd
priorization of the wakeups: complex operations have priority over
simple ops.
The patch restores the behavior of linux <=3.0.9: The longest waiting
operation has the highest priority.
This is done by using only one queue:
- if there are complex ops, then sma->pending_alter is used.
- otherwise, the per-semaphore queues are used.
As a side effect, do_smart_update_queue() becomes much simpler: no more
goto logic.
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 'Documentation/svga.txt')
0 files changed, 0 insertions, 0 deletions