diff options
| -rw-r--r-- | include/linux/workqueue.h | 18 | ||||
| -rw-r--r-- | kernel/workqueue.c | 39 |
2 files changed, 46 insertions, 11 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h index 4f4fdba..eb753b7 100644 --- a/include/linux/workqueue.h +++ b/include/linux/workqueue.h @@ -225,11 +225,11 @@ enum { }; extern struct workqueue_struct * -__create_workqueue_key(const char *name, unsigned int flags, +__create_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) \ +#define __create_workqueue(name, flags, max_active) \ ({ \ static struct lock_class_key __key; \ const char *__lock_name; \ @@ -239,20 +239,20 @@ __create_workqueue_key(const char *name, unsigned int flags, else \ __lock_name = #name; \ \ - __create_workqueue_key((name), (flags), &__key, \ - __lock_name); \ + __create_workqueue_key((name), (flags), (max_active), \ + &__key, __lock_name); \ }) #else -#define __create_workqueue(name, flags) \ - __create_workqueue_key((name), (flags), NULL, NULL) +#define __create_workqueue(name, flags, max_active) \ + __create_workqueue_key((name), (flags), (max_active), NULL, NULL) #endif #define create_workqueue(name) \ - __create_workqueue((name), 0) + __create_workqueue((name), 0, 1) #define create_freezeable_workqueue(name) \ - __create_workqueue((name), WQ_FREEZEABLE | WQ_SINGLE_THREAD) + __create_workqueue((name), WQ_FREEZEABLE | WQ_SINGLE_THREAD, 1) #define create_singlethread_workqueue(name) \ - __create_workqueue((name), WQ_SINGLE_THREAD) + __create_workqueue((name), WQ_SINGLE_THREAD, 1) extern void destroy_workqueue(struct workqueue_struct *wq); diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 9953d3c..e541b5d 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -77,6 +77,9 @@ struct cpu_workqueue_struct { int flush_color; /* L: flushing color */ int nr_in_flight[WORK_NR_COLORS]; /* L: nr of in_flight works */ + int nr_active; /* L: nr of active works */ + int max_active; /* I: max active works */ + struct list_head delayed_works; /* L: delayed works */ }; /* @@ -321,14 +324,24 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq, struct work_struct *work) { struct cpu_workqueue_struct *cwq = target_cwq(cpu, wq); + struct list_head *worklist; unsigned long flags; debug_work_activate(work); + spin_lock_irqsave(&cwq->lock, flags); BUG_ON(!list_empty(&work->entry)); + cwq->nr_in_flight[cwq->work_color]++; - insert_work(cwq, work, &cwq->worklist, - work_color_to_flags(cwq->work_color)); + + if (likely(cwq->nr_active < cwq->max_active)) { + cwq->nr_active++; + worklist = &cwq->worklist; + } else + worklist = &cwq->delayed_works; + + insert_work(cwq, work, worklist, work_color_to_flags(cwq->work_color)); + spin_unlock_irqrestore(&cwq->lock, flags); } @@ -584,6 +597,15 @@ static void move_linked_works(struct work_struct *work, struct list_head *head, *nextp = n; } +static void cwq_activate_first_delayed(struct cpu_workqueue_struct *cwq) +{ + struct work_struct *work = list_first_entry(&cwq->delayed_works, + struct work_struct, entry); + + move_linked_works(work, &cwq->worklist, NULL); + cwq->nr_active++; +} + /** * cwq_dec_nr_in_flight - decrement cwq's nr_in_flight * @cwq: cwq of interest @@ -602,6 +624,12 @@ static void cwq_dec_nr_in_flight(struct cpu_workqueue_struct *cwq, int color) return; cwq->nr_in_flight[color]--; + cwq->nr_active--; + + /* one down, submit a delayed one */ + if (!list_empty(&cwq->delayed_works) && + cwq->nr_active < cwq->max_active) + cwq_activate_first_delayed(cwq); /* is flush in progress and are we at the flushing tip? */ if (likely(cwq->flush_color != color)) @@ -1505,6 +1533,7 @@ static void free_cwqs(struct cpu_workqueue_struct *cwqs) struct workqueue_struct *__create_workqueue_key(const char *name, unsigned int flags, + int max_active, struct lock_class_key *key, const char *lock_name) { @@ -1513,6 +1542,8 @@ struct workqueue_struct *__create_workqueue_key(const char *name, bool failed = false; unsigned int cpu; + max_active = clamp_val(max_active, 1, INT_MAX); + wq = kzalloc(sizeof(*wq), GFP_KERNEL); if (!wq) goto err; @@ -1544,8 +1575,10 @@ struct workqueue_struct *__create_workqueue_key(const char *name, cwq->cpu = cpu; cwq->wq = wq; cwq->flush_color = -1; + cwq->max_active = max_active; spin_lock_init(&cwq->lock); INIT_LIST_HEAD(&cwq->worklist); + INIT_LIST_HEAD(&cwq->delayed_works); init_waitqueue_head(&cwq->more_work); if (failed) @@ -1607,6 +1640,8 @@ void destroy_workqueue(struct workqueue_struct *wq) for (i = 0; i < WORK_NR_COLORS; i++) BUG_ON(cwq->nr_in_flight[i]); + BUG_ON(cwq->nr_active); + BUG_ON(!list_empty(&cwq->delayed_works)); } free_cwqs(wq->cpu_wq); |
