workqueue: s/__create_workqueue()/alloc_workqueue()/, and add system workqueues

This patch makes changes to make new workqueue features available to
its users.

* Now that workqueue is more featureful, there should be a public
  workqueue creation function which takes paramters to control them.
  Rename __create_workqueue() to alloc_workqueue() and make 0
  max_active mean WQ_DFL_ACTIVE.  In the long run, all
  create_workqueue_*() will be converted over to alloc_workqueue().

* To further unify access interface, rename keventd_wq to system_wq
  and export it.

* Add system_long_wq and system_nrt_wq.  The former is to host long
  running works separately (so that flush_scheduled_work() dosen't
  take so long) and the latter guarantees any queued work item is
  never executed in parallel by multiple CPUs.  These will be used by
  future patches to update workqueue users.

Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 29 insertions, 11 deletions

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 33e24e734d5..48b7422f25a 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -232,12 +232,31 @@ enum {
 	WQ_DFL_ACTIVE		= WQ_MAX_ACTIVE / 2,
 };
 
+/*
+ * System-wide workqueues which are always present.
+ *
+ * system_wq is the one used by schedule[_delayed]_work[_on]().
+ * Multi-CPU multi-threaded.  There are users which expect relatively
+ * short queue flush time.  Don't queue works which can run for too
+ * long.
+ *
+ * system_long_wq is similar to system_wq but may host long running
+ * works.  Queue flushing might take relatively long.
+ *
+ * system_nrt_wq is non-reentrant and guarantees that any given work
+ * item is never executed in parallel by multiple CPUs.  Queue
+ * flushing might take relatively long.
+ */
+extern struct workqueue_struct *system_wq;
+extern struct workqueue_struct *system_long_wq;
+extern struct workqueue_struct *system_nrt_wq;
+
 extern struct workqueue_struct *
-__create_workqueue_key(const char *name, unsigned int flags, int max_active,
-		       struct lock_class_key *key, const char *lock_name);
+__alloc_workqueue_key(const char *name, unsigned int flags, int max_active,
+		      struct lock_class_key *key, const char *lock_name);
 
 #ifdef CONFIG_LOCKDEP
-#define __create_workqueue(name, flags, max_active)		\
+#define alloc_workqueue(name, flags, max_active)		\
 ({								\
 	static struct lock_class_key __key;			\
 	const char *__lock_name;				\
@@ -247,21 +266,20 @@ __create_workqueue_key(const char *name, unsigned int flags, int max_active,
 	else							\
 		__lock_name = #name;				\
 								\
-	__create_workqueue_key((name), (flags), (max_active),	\
-				&__key, __lock_name);		\
+	__alloc_workqueue_key((name), (flags), (max_active),	\
+			      &__key, __lock_name);		\
 })
 #else
-#define __create_workqueue(name, flags, max_active)		\
-	__create_workqueue_key((name), (flags), (max_active), NULL, NULL)
+#define alloc_workqueue(name, flags, max_active)		\
+	__alloc_workqueue_key((name), (flags), (max_active), NULL, NULL)
 #endif
 
 #define create_workqueue(name)					\
-	__create_workqueue((name), WQ_RESCUER, 1)
+	alloc_workqueue((name), WQ_RESCUER, 1)
 #define create_freezeable_workqueue(name)			\
-	__create_workqueue((name),				\
-			   WQ_FREEZEABLE | WQ_SINGLE_CPU | WQ_RESCUER, 1)
+	alloc_workqueue((name), WQ_FREEZEABLE | WQ_SINGLE_CPU | WQ_RESCUER, 1)
 #define create_singlethread_workqueue(name)			\
-	__create_workqueue((name), WQ_SINGLE_CPU | WQ_RESCUER, 1)
+	alloc_workqueue((name), WQ_SINGLE_CPU | WQ_RESCUER, 1)
 
 extern void destroy_workqueue(struct workqueue_struct *wq);