workqueue: introduce global cwq and unify cwq locks
There is one gcwq (global cwq) per each cpu and all cwqs on an cpu point to it. A gcwq contains a lock to be used by all cwqs on the cpu and an ida to give IDs to workers belonging to the cpu. This patch introduces gcwq, moves worker_ida into gcwq and make all cwqs on the same cpu use the cpu's gcwq->lock instead of separate locks. gcwq->ida is now protected by gcwq->lock too. Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo
parent
a0a1a5fd4f
commit
8b03ae3cde
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@ -40,23 +40,34 @@
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*
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* I: Set during initialization and read-only afterwards.
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*
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* L: cwq->lock protected. Access with cwq->lock held.
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* L: gcwq->lock protected. Access with gcwq->lock held.
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*
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* F: wq->flush_mutex protected.
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*
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* W: workqueue_lock protected.
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*/
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struct global_cwq;
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struct cpu_workqueue_struct;
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struct worker {
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struct work_struct *current_work; /* L: work being processed */
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struct list_head scheduled; /* L: scheduled works */
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struct task_struct *task; /* I: worker task */
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struct global_cwq *gcwq; /* I: the associated gcwq */
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struct cpu_workqueue_struct *cwq; /* I: the associated cwq */
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int id; /* I: worker id */
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};
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/*
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* Global per-cpu workqueue.
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*/
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struct global_cwq {
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spinlock_t lock; /* the gcwq lock */
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unsigned int cpu; /* I: the associated cpu */
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struct ida worker_ida; /* L: for worker IDs */
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} ____cacheline_aligned_in_smp;
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/*
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* The per-CPU workqueue (if single thread, we always use the first
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* possible cpu). The lower WORK_STRUCT_FLAG_BITS of
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@ -64,14 +75,10 @@ struct worker {
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* aligned at two's power of the number of flag bits.
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*/
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struct cpu_workqueue_struct {
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spinlock_t lock;
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struct global_cwq *gcwq; /* I: the associated gcwq */
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struct list_head worklist;
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wait_queue_head_t more_work;
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unsigned int cpu;
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struct worker *worker;
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struct workqueue_struct *wq; /* I: the owning workqueue */
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int work_color; /* L: current color */
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int flush_color; /* L: flushing color */
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@ -228,13 +235,19 @@ static inline void debug_work_deactivate(struct work_struct *work) { }
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/* Serializes the accesses to the list of workqueues. */
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static DEFINE_SPINLOCK(workqueue_lock);
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static LIST_HEAD(workqueues);
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static DEFINE_PER_CPU(struct ida, worker_ida);
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static bool workqueue_freezing; /* W: have wqs started freezing? */
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static DEFINE_PER_CPU(struct global_cwq, global_cwq);
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static int worker_thread(void *__worker);
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static int singlethread_cpu __read_mostly;
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static struct global_cwq *get_gcwq(unsigned int cpu)
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{
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return &per_cpu(global_cwq, cpu);
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}
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static struct cpu_workqueue_struct *get_cwq(unsigned int cpu,
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struct workqueue_struct *wq)
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{
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@ -303,7 +316,7 @@ static inline struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
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* Insert @work into @cwq after @head.
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*
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* CONTEXT:
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* spin_lock_irq(cwq->lock).
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* spin_lock_irq(gcwq->lock).
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*/
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static void insert_work(struct cpu_workqueue_struct *cwq,
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struct work_struct *work, struct list_head *head,
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@ -326,12 +339,13 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq,
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struct work_struct *work)
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{
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struct cpu_workqueue_struct *cwq = target_cwq(cpu, wq);
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struct global_cwq *gcwq = cwq->gcwq;
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struct list_head *worklist;
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unsigned long flags;
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debug_work_activate(work);
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spin_lock_irqsave(&cwq->lock, flags);
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spin_lock_irqsave(&gcwq->lock, flags);
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BUG_ON(!list_empty(&work->entry));
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cwq->nr_in_flight[cwq->work_color]++;
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@ -344,7 +358,7 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq,
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insert_work(cwq, work, worklist, work_color_to_flags(cwq->work_color));
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spin_unlock_irqrestore(&cwq->lock, flags);
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spin_unlock_irqrestore(&gcwq->lock, flags);
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}
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/**
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@ -483,39 +497,41 @@ static struct worker *alloc_worker(void)
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*/
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static struct worker *create_worker(struct cpu_workqueue_struct *cwq, bool bind)
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{
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struct global_cwq *gcwq = cwq->gcwq;
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int id = -1;
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struct worker *worker = NULL;
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spin_lock(&workqueue_lock);
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while (ida_get_new(&per_cpu(worker_ida, cwq->cpu), &id)) {
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spin_unlock(&workqueue_lock);
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if (!ida_pre_get(&per_cpu(worker_ida, cwq->cpu), GFP_KERNEL))
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spin_lock_irq(&gcwq->lock);
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while (ida_get_new(&gcwq->worker_ida, &id)) {
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spin_unlock_irq(&gcwq->lock);
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if (!ida_pre_get(&gcwq->worker_ida, GFP_KERNEL))
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goto fail;
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spin_lock(&workqueue_lock);
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spin_lock_irq(&gcwq->lock);
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}
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spin_unlock(&workqueue_lock);
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spin_unlock_irq(&gcwq->lock);
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worker = alloc_worker();
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if (!worker)
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goto fail;
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worker->gcwq = gcwq;
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worker->cwq = cwq;
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worker->id = id;
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worker->task = kthread_create(worker_thread, worker, "kworker/%u:%d",
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cwq->cpu, id);
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gcwq->cpu, id);
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if (IS_ERR(worker->task))
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goto fail;
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if (bind)
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kthread_bind(worker->task, cwq->cpu);
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kthread_bind(worker->task, gcwq->cpu);
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return worker;
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fail:
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if (id >= 0) {
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spin_lock(&workqueue_lock);
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ida_remove(&per_cpu(worker_ida, cwq->cpu), id);
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spin_unlock(&workqueue_lock);
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spin_lock_irq(&gcwq->lock);
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ida_remove(&gcwq->worker_ida, id);
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spin_unlock_irq(&gcwq->lock);
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}
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kfree(worker);
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return NULL;
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@ -528,7 +544,7 @@ fail:
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* Start @worker.
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*
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* CONTEXT:
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* spin_lock_irq(cwq->lock).
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* spin_lock_irq(gcwq->lock).
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*/
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static void start_worker(struct worker *worker)
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{
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@ -543,7 +559,7 @@ static void start_worker(struct worker *worker)
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*/
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static void destroy_worker(struct worker *worker)
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{
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int cpu = worker->cwq->cpu;
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struct global_cwq *gcwq = worker->gcwq;
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int id = worker->id;
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/* sanity check frenzy */
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@ -553,9 +569,9 @@ static void destroy_worker(struct worker *worker)
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kthread_stop(worker->task);
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kfree(worker);
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spin_lock(&workqueue_lock);
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ida_remove(&per_cpu(worker_ida, cpu), id);
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spin_unlock(&workqueue_lock);
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spin_lock_irq(&gcwq->lock);
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ida_remove(&gcwq->worker_ida, id);
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spin_unlock_irq(&gcwq->lock);
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}
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/**
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@ -573,7 +589,7 @@ static void destroy_worker(struct worker *worker)
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* nested inside outer list_for_each_entry_safe().
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*
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* CONTEXT:
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* spin_lock_irq(cwq->lock).
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* spin_lock_irq(gcwq->lock).
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*/
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static void move_linked_works(struct work_struct *work, struct list_head *head,
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struct work_struct **nextp)
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@ -617,7 +633,7 @@ static void cwq_activate_first_delayed(struct cpu_workqueue_struct *cwq)
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* decrement nr_in_flight of its cwq and handle workqueue flushing.
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*
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* CONTEXT:
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* spin_lock_irq(cwq->lock).
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* spin_lock_irq(gcwq->lock).
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*/
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static void cwq_dec_nr_in_flight(struct cpu_workqueue_struct *cwq, int color)
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{
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@ -664,11 +680,12 @@ static void cwq_dec_nr_in_flight(struct cpu_workqueue_struct *cwq, int color)
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* call this function to process a work.
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*
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* CONTEXT:
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* spin_lock_irq(cwq->lock) which is released and regrabbed.
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* spin_lock_irq(gcwq->lock) which is released and regrabbed.
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*/
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static void process_one_work(struct worker *worker, struct work_struct *work)
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{
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struct cpu_workqueue_struct *cwq = worker->cwq;
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struct global_cwq *gcwq = cwq->gcwq;
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work_func_t f = work->func;
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int work_color;
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#ifdef CONFIG_LOCKDEP
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@ -687,7 +704,7 @@ static void process_one_work(struct worker *worker, struct work_struct *work)
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work_color = get_work_color(work);
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list_del_init(&work->entry);
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spin_unlock_irq(&cwq->lock);
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spin_unlock_irq(&gcwq->lock);
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BUG_ON(get_wq_data(work) != cwq);
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work_clear_pending(work);
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@ -707,7 +724,7 @@ static void process_one_work(struct worker *worker, struct work_struct *work)
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dump_stack();
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}
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spin_lock_irq(&cwq->lock);
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spin_lock_irq(&gcwq->lock);
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/* we're done with it, release */
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worker->current_work = NULL;
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@ -723,7 +740,7 @@ static void process_one_work(struct worker *worker, struct work_struct *work)
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* fetches a work from the top and executes it.
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*
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* CONTEXT:
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* spin_lock_irq(cwq->lock) which may be released and regrabbed
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* spin_lock_irq(gcwq->lock) which may be released and regrabbed
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* multiple times.
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*/
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static void process_scheduled_works(struct worker *worker)
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@ -744,6 +761,7 @@ static void process_scheduled_works(struct worker *worker)
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static int worker_thread(void *__worker)
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{
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struct worker *worker = __worker;
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struct global_cwq *gcwq = worker->gcwq;
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struct cpu_workqueue_struct *cwq = worker->cwq;
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DEFINE_WAIT(wait);
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@ -758,11 +776,11 @@ static int worker_thread(void *__worker)
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break;
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if (unlikely(!cpumask_equal(&worker->task->cpus_allowed,
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get_cpu_mask(cwq->cpu))))
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get_cpu_mask(gcwq->cpu))))
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set_cpus_allowed_ptr(worker->task,
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get_cpu_mask(cwq->cpu));
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get_cpu_mask(gcwq->cpu));
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spin_lock_irq(&cwq->lock);
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spin_lock_irq(&gcwq->lock);
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while (!list_empty(&cwq->worklist)) {
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struct work_struct *work =
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@ -782,7 +800,7 @@ static int worker_thread(void *__worker)
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}
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}
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spin_unlock_irq(&cwq->lock);
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spin_unlock_irq(&gcwq->lock);
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}
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return 0;
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@ -821,7 +839,7 @@ static void wq_barrier_func(struct work_struct *work)
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* underneath us, so we can't reliably determine cwq from @target.
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*
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* CONTEXT:
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* spin_lock_irq(cwq->lock).
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* spin_lock_irq(gcwq->lock).
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*/
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static void insert_wq_barrier(struct cpu_workqueue_struct *cwq,
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struct wq_barrier *barr,
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@ -831,7 +849,7 @@ static void insert_wq_barrier(struct cpu_workqueue_struct *cwq,
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unsigned int linked = 0;
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/*
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* debugobject calls are safe here even with cwq->lock locked
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* debugobject calls are safe here even with gcwq->lock locked
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* as we know for sure that this will not trigger any of the
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* checks and call back into the fixup functions where we
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* might deadlock.
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@ -904,8 +922,9 @@ static bool flush_workqueue_prep_cwqs(struct workqueue_struct *wq,
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for_each_possible_cpu(cpu) {
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struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
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struct global_cwq *gcwq = cwq->gcwq;
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spin_lock_irq(&cwq->lock);
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spin_lock_irq(&gcwq->lock);
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if (flush_color >= 0) {
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BUG_ON(cwq->flush_color != -1);
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@ -922,7 +941,7 @@ static bool flush_workqueue_prep_cwqs(struct workqueue_struct *wq,
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cwq->work_color = work_color;
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}
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spin_unlock_irq(&cwq->lock);
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spin_unlock_irq(&gcwq->lock);
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}
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if (flush_color >= 0 && atomic_dec_and_test(&wq->nr_cwqs_to_flush))
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@ -1097,17 +1116,19 @@ int flush_work(struct work_struct *work)
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{
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struct worker *worker = NULL;
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struct cpu_workqueue_struct *cwq;
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struct global_cwq *gcwq;
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struct wq_barrier barr;
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might_sleep();
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cwq = get_wq_data(work);
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if (!cwq)
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return 0;
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gcwq = cwq->gcwq;
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lock_map_acquire(&cwq->wq->lockdep_map);
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lock_map_release(&cwq->wq->lockdep_map);
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spin_lock_irq(&cwq->lock);
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spin_lock_irq(&gcwq->lock);
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if (!list_empty(&work->entry)) {
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/*
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* See the comment near try_to_grab_pending()->smp_rmb().
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@ -1124,12 +1145,12 @@ int flush_work(struct work_struct *work)
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}
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insert_wq_barrier(cwq, &barr, work, worker);
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spin_unlock_irq(&cwq->lock);
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spin_unlock_irq(&gcwq->lock);
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wait_for_completion(&barr.done);
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destroy_work_on_stack(&barr.work);
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return 1;
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already_gone:
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spin_unlock_irq(&cwq->lock);
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spin_unlock_irq(&gcwq->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(flush_work);
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@ -1140,6 +1161,7 @@ EXPORT_SYMBOL_GPL(flush_work);
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*/
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static int try_to_grab_pending(struct work_struct *work)
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{
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struct global_cwq *gcwq;
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struct cpu_workqueue_struct *cwq;
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int ret = -1;
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@ -1154,8 +1176,9 @@ static int try_to_grab_pending(struct work_struct *work)
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cwq = get_wq_data(work);
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if (!cwq)
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return ret;
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gcwq = cwq->gcwq;
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spin_lock_irq(&cwq->lock);
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spin_lock_irq(&gcwq->lock);
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if (!list_empty(&work->entry)) {
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/*
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* This work is queued, but perhaps we locked the wrong cwq.
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@ -1170,7 +1193,7 @@ static int try_to_grab_pending(struct work_struct *work)
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ret = 1;
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}
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}
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spin_unlock_irq(&cwq->lock);
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spin_unlock_irq(&gcwq->lock);
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return ret;
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}
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@ -1178,10 +1201,11 @@ static int try_to_grab_pending(struct work_struct *work)
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static void wait_on_cpu_work(struct cpu_workqueue_struct *cwq,
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struct work_struct *work)
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{
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struct global_cwq *gcwq = cwq->gcwq;
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struct wq_barrier barr;
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struct worker *worker;
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spin_lock_irq(&cwq->lock);
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spin_lock_irq(&gcwq->lock);
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worker = NULL;
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if (unlikely(cwq->worker && cwq->worker->current_work == work)) {
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@ -1189,7 +1213,7 @@ static void wait_on_cpu_work(struct cpu_workqueue_struct *cwq,
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insert_wq_barrier(cwq, &barr, work, worker);
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}
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spin_unlock_irq(&cwq->lock);
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spin_unlock_irq(&gcwq->lock);
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if (unlikely(worker)) {
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wait_for_completion(&barr.done);
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@ -1567,13 +1591,13 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
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*/
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for_each_possible_cpu(cpu) {
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struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
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struct global_cwq *gcwq = get_gcwq(cpu);
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BUG_ON((unsigned long)cwq & WORK_STRUCT_FLAG_MASK);
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cwq->cpu = cpu;
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cwq->gcwq = gcwq;
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cwq->wq = wq;
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cwq->flush_color = -1;
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cwq->max_active = max_active;
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spin_lock_init(&cwq->lock);
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INIT_LIST_HEAD(&cwq->worklist);
|
||||
INIT_LIST_HEAD(&cwq->delayed_works);
|
||||
init_waitqueue_head(&cwq->more_work);
|
||||
|
|
@ -1744,7 +1768,7 @@ EXPORT_SYMBOL_GPL(work_on_cpu);
|
|||
* list instead of the cwq ones.
|
||||
*
|
||||
* CONTEXT:
|
||||
* Grabs and releases workqueue_lock and cwq->lock's.
|
||||
* Grabs and releases workqueue_lock and gcwq->lock's.
|
||||
*/
|
||||
void freeze_workqueues_begin(void)
|
||||
{
|
||||
|
|
@ -1757,16 +1781,18 @@ void freeze_workqueues_begin(void)
|
|||
workqueue_freezing = true;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
struct global_cwq *gcwq = get_gcwq(cpu);
|
||||
|
||||
spin_lock_irq(&gcwq->lock);
|
||||
|
||||
list_for_each_entry(wq, &workqueues, list) {
|
||||
struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
|
||||
|
||||
spin_lock_irq(&cwq->lock);
|
||||
|
||||
if (wq->flags & WQ_FREEZEABLE)
|
||||
cwq->max_active = 0;
|
||||
|
||||
spin_unlock_irq(&cwq->lock);
|
||||
}
|
||||
|
||||
spin_unlock_irq(&gcwq->lock);
|
||||
}
|
||||
|
||||
spin_unlock(&workqueue_lock);
|
||||
|
|
@ -1825,7 +1851,7 @@ out_unlock:
|
|||
* frozen works are transferred to their respective cwq worklists.
|
||||
*
|
||||
* CONTEXT:
|
||||
* Grabs and releases workqueue_lock and cwq->lock's.
|
||||
* Grabs and releases workqueue_lock and gcwq->lock's.
|
||||
*/
|
||||
void thaw_workqueues(void)
|
||||
{
|
||||
|
|
@ -1838,14 +1864,16 @@ void thaw_workqueues(void)
|
|||
goto out_unlock;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
struct global_cwq *gcwq = get_gcwq(cpu);
|
||||
|
||||
spin_lock_irq(&gcwq->lock);
|
||||
|
||||
list_for_each_entry(wq, &workqueues, list) {
|
||||
struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
|
||||
|
||||
if (!(wq->flags & WQ_FREEZEABLE))
|
||||
continue;
|
||||
|
||||
spin_lock_irq(&cwq->lock);
|
||||
|
||||
/* restore max_active and repopulate worklist */
|
||||
cwq->max_active = wq->saved_max_active;
|
||||
|
||||
|
|
@ -1854,9 +1882,9 @@ void thaw_workqueues(void)
|
|||
cwq_activate_first_delayed(cwq);
|
||||
|
||||
wake_up(&cwq->more_work);
|
||||
|
||||
spin_unlock_irq(&cwq->lock);
|
||||
}
|
||||
|
||||
spin_unlock_irq(&gcwq->lock);
|
||||
}
|
||||
|
||||
workqueue_freezing = false;
|
||||
|
|
@ -1869,11 +1897,19 @@ void __init init_workqueues(void)
|
|||
{
|
||||
unsigned int cpu;
|
||||
|
||||
for_each_possible_cpu(cpu)
|
||||
ida_init(&per_cpu(worker_ida, cpu));
|
||||
|
||||
singlethread_cpu = cpumask_first(cpu_possible_mask);
|
||||
hotcpu_notifier(workqueue_cpu_callback, 0);
|
||||
|
||||
/* initialize gcwqs */
|
||||
for_each_possible_cpu(cpu) {
|
||||
struct global_cwq *gcwq = get_gcwq(cpu);
|
||||
|
||||
spin_lock_init(&gcwq->lock);
|
||||
gcwq->cpu = cpu;
|
||||
|
||||
ida_init(&gcwq->worker_ida);
|
||||
}
|
||||
|
||||
keventd_wq = create_workqueue("events");
|
||||
BUG_ON(!keventd_wq);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue