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authorTejun Heo <tj@kernel.org>2010-10-11 15:12:27 +0200
committerTejun Heo <tj@kernel.org>2010-10-11 15:20:26 +0200
commit6370a6ad3b53df90b4700977f7718118a2cd524a (patch)
tree2d1f45a19e66329813ce133b18f920d8c450b0c0 /kernel/workqueue.c
parent30310045dd20a286cf3800f063f79b468e132fb1 (diff)
workqueue: add and use WQ_MEM_RECLAIM flag
Add WQ_MEM_RECLAIM flag which currently maps to WQ_RESCUER, mark WQ_RESCUER as internal and replace all external WQ_RESCUER usages to WQ_MEM_RECLAIM. This makes the API users express the intent of the workqueue instead of indicating the internal mechanism used to guarantee forward progress. This is also to make it cleaner to add more semantics to WQ_MEM_RECLAIM. For example, if deemed necessary, memory reclaim workqueues can be made highpri. This patch doesn't introduce any functional change. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'kernel/workqueue.c')
-rw-r--r--kernel/workqueue.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index b57a8babdec3..2c6871cbcbee 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2848,6 +2848,13 @@ struct workqueue_struct *__alloc_workqueue_key(const char *name,
unsigned int cpu;
/*
+ * Workqueues which may be used during memory reclaim should
+ * have a rescuer to guarantee forward progress.
+ */
+ if (flags & WQ_MEM_RECLAIM)
+ flags |= WQ_RESCUER;
+
+ /*
* Unbound workqueues aren't concurrency managed and should be
* dispatched to workers immediately.
*/