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workqueue: Add system wide power_efficient workqueues

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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>
This commit is contained in:
Viresh Kumar 2013-04-24 17:12:54 +05:30 • committed by Tejun Heo
parent cee22a1505
commit 0668106ca3
2 changed files with 20 additions and 1 deletions
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8
include/linux/workqueue.h
View file

@ -360,11 +360,19 @@ enum {
* *
* system_freezable_wq is equivalent to system_wq except that it's * system_freezable_wq is equivalent to system_wq except that it's
* freezable. * 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_wq;
extern struct workqueue_struct *system_long_wq; extern struct workqueue_struct *system_long_wq;
extern struct workqueue_struct *system_unbound_wq; extern struct workqueue_struct *system_unbound_wq;
extern struct workqueue_struct *system_freezable_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) static inline struct workqueue_struct * __deprecated __system_nrt_wq(void)
{ {

13
kernel/workqueue.c
View file

@ -314,6 +314,10 @@ struct workqueue_struct *system_unbound_wq __read_mostly;
EXPORT_SYMBOL_GPL(system_unbound_wq); EXPORT_SYMBOL_GPL(system_unbound_wq);
struct workqueue_struct *system_freezable_wq __read_mostly; struct workqueue_struct *system_freezable_wq __read_mostly;
EXPORT_SYMBOL_GPL(system_freezable_wq); 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 int worker_thread(void *__worker);
static void copy_workqueue_attrs(struct workqueue_attrs *to, static void copy_workqueue_attrs(struct workqueue_attrs *to,
@ -4987,8 +4991,15 @@ static int __init init_workqueues(void)
WQ_UNBOUND_MAX_ACTIVE); WQ_UNBOUND_MAX_ACTIVE);
system_freezable_wq = alloc_workqueue("events_freezable", system_freezable_wq = alloc_workqueue("events_freezable",
WQ_FREEZABLE, 0); 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 || 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; return 0;
} }
early_initcall(init_workqueues); early_initcall(init_workqueues);