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authorTejun Heo <tj@kernel.org>2010-06-29 12:07:14 +0400
committerTejun Heo <tj@kernel.org>2010-06-29 12:07:14 +0400
commit649027d73a6309ac34dc2886362e662bd73456dc (patch)
tree4faf07773683ff5ec2b120d9070dbbb590199057 /include/linux/workqueue.h
parentdcd989cb73ab0f7b722d64ab6516f101d9f43f88 (diff)
downloadlinux-649027d73a6309ac34dc2886362e662bd73456dc.tar.xz
workqueue: implement high priority workqueue
This patch implements high priority workqueue which can be specified with WQ_HIGHPRI flag on creation. A high priority workqueue has the following properties. * A work queued to it is queued at the head of the worklist of the respective gcwq after other highpri works, while normal works are always appended at the end. * As long as there are highpri works on gcwq->worklist, [__]need_more_worker() remains %true and process_one_work() wakes up another worker before it start executing a work. The above two properties guarantee that works queued to high priority workqueues are dispatched to workers and start execution as soon as possible regardless of the state of other works. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/workqueue.h')
-rw-r--r--include/linux/workqueue.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 0a7f79729380..006dcf7e808a 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -231,6 +231,7 @@ enum {
WQ_SINGLE_CPU = 1 << 1, /* only single cpu at a time */
WQ_NON_REENTRANT = 1 << 2, /* guarantee non-reentrance */
WQ_RESCUER = 1 << 3, /* has an rescue worker */
+ WQ_HIGHPRI = 1 << 4, /* high priority */
WQ_MAX_ACTIVE = 512, /* I like 512, better ideas? */
WQ_DFL_ACTIVE = WQ_MAX_ACTIVE / 2,