diff options
| -rw-r--r-- | include/linux/workqueue.h | 40 | ||||
| -rw-r--r-- | kernel/workqueue.c | 42 |
2 files changed, 54 insertions, 28 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h index 33e24e734d50..48b7422f25ae 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); diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 4190e84cf995..16ce617974d2 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -210,6 +210,13 @@ struct workqueue_struct { #endif }; +struct workqueue_struct *system_wq __read_mostly; +struct workqueue_struct *system_long_wq __read_mostly; +struct workqueue_struct *system_nrt_wq __read_mostly; +EXPORT_SYMBOL_GPL(system_wq); +EXPORT_SYMBOL_GPL(system_long_wq); +EXPORT_SYMBOL_GPL(system_nrt_wq); + #define for_each_busy_worker(worker, i, pos, gcwq) \ for (i = 0; i < BUSY_WORKER_HASH_SIZE; i++) \ hlist_for_each_entry(worker, pos, &gcwq->busy_hash[i], hentry) @@ -2306,8 +2313,6 @@ int cancel_delayed_work_sync(struct delayed_work *dwork) } EXPORT_SYMBOL(cancel_delayed_work_sync); -static struct workqueue_struct *keventd_wq __read_mostly; - /** * schedule_work - put work task in global workqueue * @work: job to be done @@ -2321,7 +2326,7 @@ static struct workqueue_struct *keventd_wq __read_mostly; */ int schedule_work(struct work_struct *work) { - return queue_work(keventd_wq, work); + return queue_work(system_wq, work); } EXPORT_SYMBOL(schedule_work); @@ -2334,7 +2339,7 @@ EXPORT_SYMBOL(schedule_work); */ int schedule_work_on(int cpu, struct work_struct *work) { - return queue_work_on(cpu, keventd_wq, work); + return queue_work_on(cpu, system_wq, work); } EXPORT_SYMBOL(schedule_work_on); @@ -2349,7 +2354,7 @@ EXPORT_SYMBOL(schedule_work_on); int schedule_delayed_work(struct delayed_work *dwork, unsigned long delay) { - return queue_delayed_work(keventd_wq, dwork, delay); + return queue_delayed_work(system_wq, dwork, delay); } EXPORT_SYMBOL(schedule_delayed_work); @@ -2382,7 +2387,7 @@ EXPORT_SYMBOL(flush_delayed_work); int schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay) { - return queue_delayed_work_on(cpu, keventd_wq, dwork, delay); + return queue_delayed_work_on(cpu, system_wq, dwork, delay); } EXPORT_SYMBOL(schedule_delayed_work_on); @@ -2447,7 +2452,7 @@ int schedule_on_each_cpu(work_func_t func) */ void flush_scheduled_work(void) { - flush_workqueue(keventd_wq); + flush_workqueue(system_wq); } EXPORT_SYMBOL(flush_scheduled_work); @@ -2479,7 +2484,7 @@ EXPORT_SYMBOL_GPL(execute_in_process_context); int keventd_up(void) { - return keventd_wq != NULL; + return system_wq != NULL; } static struct cpu_workqueue_struct *alloc_cwqs(void) @@ -2539,15 +2544,16 @@ static int wq_clamp_max_active(int max_active, const char *name) return clamp_val(max_active, 1, WQ_MAX_ACTIVE); } -struct workqueue_struct *__create_workqueue_key(const char *name, - unsigned int flags, - int max_active, - struct lock_class_key *key, - const char *lock_name) +struct workqueue_struct *__alloc_workqueue_key(const char *name, + unsigned int flags, + int max_active, + struct lock_class_key *key, + const char *lock_name) { struct workqueue_struct *wq; unsigned int cpu; + max_active = max_active ?: WQ_DFL_ACTIVE; max_active = wq_clamp_max_active(max_active, name); wq = kzalloc(sizeof(*wq), GFP_KERNEL); @@ -2626,7 +2632,7 @@ err: } return NULL; } -EXPORT_SYMBOL_GPL(__create_workqueue_key); +EXPORT_SYMBOL_GPL(__alloc_workqueue_key); /** * destroy_workqueue - safely terminate a workqueue @@ -2910,7 +2916,7 @@ static int __cpuinit trustee_thread(void *__gcwq) continue; debug_work_activate(rebind_work); - insert_work(get_cwq(gcwq->cpu, keventd_wq), rebind_work, + insert_work(get_cwq(gcwq->cpu, system_wq), rebind_work, worker->scheduled.next, work_color_to_flags(WORK_NO_COLOR)); } @@ -3287,6 +3293,8 @@ void __init init_workqueues(void) spin_unlock_irq(&gcwq->lock); } - keventd_wq = __create_workqueue("events", 0, WQ_DFL_ACTIVE); - BUG_ON(!keventd_wq); + system_wq = alloc_workqueue("events", 0, 0); + system_long_wq = alloc_workqueue("events_long", 0, 0); + system_nrt_wq = alloc_workqueue("events_nrt", WQ_NON_REENTRANT, 0); + BUG_ON(!system_wq || !system_long_wq || !system_nrt_wq); } |