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authorTejun Heo <tj@kernel.org>2010-06-29 10:07:12 +0200
committerTejun Heo <tj@kernel.org>2010-06-29 10:07:12 +0200
commitaffee4b294a0fc97d67c8a77dc080c4dd262a79e (patch)
tree5b3fd79640ad7940e0abbed193a192d3919f259d /include/linux/workqueue.h
parentc34056a3fdde777c079cc8a70785c2602f2586cb (diff)
workqueue: reimplement work flushing using linked works
A work is linked to the next one by having WORK_STRUCT_LINKED bit set and these links can be chained. When a linked work is dispatched to a worker, all linked works are dispatched to the worker's newly added ->scheduled queue and processed back-to-back. Currently, as there's only single worker per cwq, having linked works doesn't make any visible behavior difference. This change is to prepare for multiple shared workers per cpu. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/workqueue.h')
-rw-r--r--include/linux/workqueue.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 8762f62103d..4f4fdba722c 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -24,8 +24,9 @@ typedef void (*work_func_t)(struct work_struct *work);
enum {
WORK_STRUCT_PENDING_BIT = 0, /* work item is pending execution */
+ WORK_STRUCT_LINKED_BIT = 1, /* next work is linked to this one */
#ifdef CONFIG_DEBUG_OBJECTS_WORK
- WORK_STRUCT_STATIC_BIT = 1, /* static initializer (debugobjects) */
+ WORK_STRUCT_STATIC_BIT = 2, /* static initializer (debugobjects) */
WORK_STRUCT_COLOR_SHIFT = 3, /* color for workqueue flushing */
#else
WORK_STRUCT_COLOR_SHIFT = 2, /* color for workqueue flushing */
@@ -34,6 +35,7 @@ enum {
WORK_STRUCT_COLOR_BITS = 4,
WORK_STRUCT_PENDING = 1 << WORK_STRUCT_PENDING_BIT,
+ WORK_STRUCT_LINKED = 1 << WORK_STRUCT_LINKED_BIT,
#ifdef CONFIG_DEBUG_OBJECTS_WORK
WORK_STRUCT_STATIC = 1 << WORK_STRUCT_STATIC_BIT,
#else