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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
commita0a1a5fd4fb15ec61117c759fe9f5c16c53d9e9c (patch)
tree6df8eddcaeff6cde892c8cae6bdfa7653805e144 /include/linux/workqueue.h
parent1e19ffc63dbbaea7a7d1c63d99c38d3e5a4c7edf (diff)
workqueue: reimplement workqueue freeze using max_active
Currently, workqueue freezing is implemented by marking the worker freezeable and calling try_to_freeze() from dispatch loop. Reimplement it using cwq->limit so that the workqueue is frozen instead of the worker. * workqueue_struct->saved_max_active is added which stores the specified max_active on initialization. * On freeze, all cwq->max_active's are quenched to zero. Freezing is complete when nr_active on all cwqs reach zero. * On thaw, all cwq->max_active's are restored to wq->saved_max_active and the worklist is repopulated. This new implementation allows having single shared pool of workers per cpu. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/workqueue.h')
-rw-r--r--include/linux/workqueue.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index eb753b7790e..ab0b7fb99bc 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -340,4 +340,11 @@ static inline long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
#else
long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg);
#endif /* CONFIG_SMP */
+
+#ifdef CONFIG_FREEZER
+extern void freeze_workqueues_begin(void);
+extern bool freeze_workqueues_busy(void);
+extern void thaw_workqueues(void);
+#endif /* CONFIG_FREEZER */
+
#endif