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Commit 0668106c authored by Viresh Kumar's avatar Viresh Kumar Committed by Tejun Heo
Browse files

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: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent cee22a15

include/linux/workqueue.h

+8 −0
Original line number Diff line number Diff line
@@ -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)

{

kernel/workqueue.c

+12 −1
Original line number Diff line number Diff line
@@ -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);