workqueue: Add system wide power_efficient workqueues

This patch adds system wide workqueues aligned towards power saving. This is
done by allocating them with WQ_UNBOUND flag if 'wq_power_efficient' is set to
'true'.

tj: updated comments a bit.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

2 files changed, 20 insertions, 1 deletions

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index fc0136b604f2..a9f4119c7e2e 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -360,11 +360,19 @@ enum {
  *
  * system_freezable_wq is equivalent to system_wq except that it's
  * freezable.
+ *
+ * *_power_efficient_wq are inclined towards saving power and converted
+ * into WQ_UNBOUND variants if 'wq_power_efficient' is enabled; otherwise,
+ * they are same as their non-power-efficient counterparts - e.g.
+ * system_power_efficient_wq is identical to system_wq if
+ * 'wq_power_efficient' is disabled.  See WQ_POWER_EFFICIENT for more info.
  */
 extern struct workqueue_struct *system_wq;
 extern struct workqueue_struct *system_long_wq;
 extern struct workqueue_struct *system_unbound_wq;
 extern struct workqueue_struct *system_freezable_wq;
+extern struct workqueue_struct *system_power_efficient_wq;
+extern struct workqueue_struct *system_freezable_power_efficient_wq;
 
 static inline struct workqueue_struct * __deprecated __system_nrt_wq(void)
 {
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 8068d97ce141..16ca2d3dd29f 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -314,6 +314,10 @@ struct workqueue_struct *system_unbound_wq __read_mostly;
 EXPORT_SYMBOL_GPL(system_unbound_wq);
 struct workqueue_struct *system_freezable_wq __read_mostly;
 EXPORT_SYMBOL_GPL(system_freezable_wq);
+struct workqueue_struct *system_power_efficient_wq __read_mostly;
+EXPORT_SYMBOL_GPL(system_power_efficient_wq);
+struct workqueue_struct *system_freezable_power_efficient_wq __read_mostly;
+EXPORT_SYMBOL_GPL(system_freezable_power_efficient_wq);
 
 static int worker_thread(void *__worker);
 static void copy_workqueue_attrs(struct workqueue_attrs *to,
@@ -4987,8 +4991,15 @@ static int __init init_workqueues(void)
                                             WQ_UNBOUND_MAX_ACTIVE);
         system_freezable_wq = alloc_workqueue("events_freezable",
                                               WQ_FREEZABLE, 0);
+        system_power_efficient_wq = alloc_workqueue("events_power_efficient",
+                                              WQ_POWER_EFFICIENT, 0);
+        system_freezable_power_efficient_wq = alloc_workqueue("events_freezable_power_efficient",
+                                              WQ_FREEZABLE | WQ_POWER_EFFICIENT,
+                                              0);
         BUG_ON(!system_wq || !system_highpri_wq || !system_long_wq ||
-               !system_unbound_wq || !system_freezable_wq);
+               !system_unbound_wq || !system_freezable_wq ||
+               !system_power_efficient_wq ||
+               !system_freezable_power_efficient_wq);
         return 0;
 }
 early_initcall(init_workqueues);