186 	struct worker		*manager;	/* L: purely informational */
298 	struct worker		*rescuer;	/* MD: rescue worker */
489 #define for_each_pool_worker(worker, pool)				\  argument
490 	list_for_each_entry((worker), &(pool)->workers, node)		\
867 static inline void worker_set_flags(struct worker *worker, unsigned int flags)  in worker_set_flags()  argument
869 	struct worker_pool *pool = worker->pool;  in worker_set_flags()
875 	    !(worker->flags & WORKER_NOT_RUNNING)) {  in worker_set_flags()
879 	worker->flags |= flags;  in worker_set_flags()
889 static inline void worker_clr_flags(struct worker *worker, unsigned int flags)  in worker_clr_flags()  argument
891 	struct worker_pool *pool = worker->pool;  in worker_clr_flags()
892 	unsigned int oflags = worker->flags;  in worker_clr_flags()
896 	worker->flags &= ~flags;  in worker_clr_flags()
904 		if (!(worker->flags & WORKER_NOT_RUNNING))  in worker_clr_flags()
909 static struct worker *first_idle_worker(struct worker_pool *pool)  in first_idle_worker()
914 	return list_first_entry(&pool->idle_list, struct worker, entry);  in first_idle_worker()
927 static void worker_enter_idle(struct worker *worker)  in worker_enter_idle()  argument
929 	struct worker_pool *pool = worker->pool;  in worker_enter_idle()
931 	if (WARN_ON_ONCE(worker->flags & WORKER_IDLE) ||  in worker_enter_idle()
932 	    WARN_ON_ONCE(!list_empty(&worker->entry) &&  in worker_enter_idle()
933 			 (worker->hentry.next || worker->hentry.pprev)))  in worker_enter_idle()
937 	worker->flags |= WORKER_IDLE;  in worker_enter_idle()
939 	worker->last_active = jiffies;  in worker_enter_idle()
942 	list_add(&worker->entry, &pool->idle_list);  in worker_enter_idle()
960 static void worker_leave_idle(struct worker *worker)  in worker_leave_idle()  argument
962 	struct worker_pool *pool = worker->pool;  in worker_leave_idle()
964 	if (WARN_ON_ONCE(!(worker->flags & WORKER_IDLE)))  in worker_leave_idle()
966 	worker_clr_flags(worker, WORKER_IDLE);  in worker_leave_idle()
968 	list_del_init(&worker->entry);  in worker_leave_idle()
1004 static struct worker *find_worker_executing_work(struct worker_pool *pool,  in find_worker_executing_work()
1007 	struct worker *worker;  in find_worker_executing_work()  local
1009 	hash_for_each_possible(pool->busy_hash, worker, hentry,  in find_worker_executing_work()
1011 		if (worker->current_work == work &&  in find_worker_executing_work()
1012 		    worker->current_func == work->func)  in find_worker_executing_work()
1013 			return worker;  in find_worker_executing_work()
1072 static bool assign_work(struct work_struct *work, struct worker *worker,  in assign_work()  argument
1075 	struct worker_pool *pool = worker->pool;  in assign_work()
1076 	struct worker *collision;  in assign_work()
1094 	move_linked_works(work, &worker->scheduled, nextp);  in assign_work()
1107 	struct worker *worker = first_idle_worker(pool);  in kick_pool()  local
1112 	if (!need_more_worker(pool) || !worker)  in kick_pool()
1115 	p = worker->task;  in kick_pool()
1246 	struct worker *worker = kthread_data(task);  in wq_worker_running()  local
1248 	if (!READ_ONCE(worker->sleeping))  in wq_worker_running()
1258 	if (!(worker->flags & WORKER_NOT_RUNNING))  in wq_worker_running()
1259 		worker->pool->nr_running++;  in wq_worker_running()
1266 	worker->current_at = worker->task->se.sum_exec_runtime;  in wq_worker_running()
1268 	WRITE_ONCE(worker->sleeping, 0);  in wq_worker_running()
1280 	struct worker *worker = kthread_data(task);  in wq_worker_sleeping()  local
1288 	if (worker->flags & WORKER_NOT_RUNNING)  in wq_worker_sleeping()
1291 	pool = worker->pool;  in wq_worker_sleeping()
1294 	if (READ_ONCE(worker->sleeping))  in wq_worker_sleeping()
1297 	WRITE_ONCE(worker->sleeping, 1);  in wq_worker_sleeping()
1305 	if (worker->flags & WORKER_NOT_RUNNING) {  in wq_worker_sleeping()
1312 		worker->current_pwq->stats[PWQ_STAT_CM_WAKEUP]++;  in wq_worker_sleeping()
1326 	struct worker *worker = kthread_data(task);  in wq_worker_tick()  local
1327 	struct pool_workqueue *pwq = worker->current_pwq;  in wq_worker_tick()
1328 	struct worker_pool *pool = worker->pool;  in wq_worker_tick()
1350 	if ((worker->flags & WORKER_NOT_RUNNING) || READ_ONCE(worker->sleeping) ||  in wq_worker_tick()
1351 	    worker->task->se.sum_exec_runtime - worker->current_at <  in wq_worker_tick()
1357 	worker_set_flags(worker, WORKER_CPU_INTENSIVE);  in wq_worker_tick()
1358 	wq_cpu_intensive_report(worker->current_func);  in wq_worker_tick()
1393 	struct worker *worker = kthread_data(task);  in wq_worker_last_func()  local
1395 	return worker->last_func;  in wq_worker_last_func()
1661 	struct worker *worker;  in is_chained_work()  local
1663 	worker = current_wq_worker();  in is_chained_work()
1668 	return worker && worker->current_pwq->wq == wq;  in is_chained_work()
1747 		struct worker *worker;  in __queue_work()  local
1751 		worker = find_worker_executing_work(last_pool, work);  in __queue_work()
1753 		if (worker && worker->current_pwq->wq == wq) {  in __queue_work()
1754 			pwq = worker->current_pwq;  in __queue_work()
2067 static struct worker *alloc_worker(int node)  in alloc_worker()
2069 	struct worker *worker;  in alloc_worker()  local
2071 	worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, node);  in alloc_worker()
2072 	if (worker) {  in alloc_worker()
2073 		INIT_LIST_HEAD(&worker->entry);  in alloc_worker()
2074 		INIT_LIST_HEAD(&worker->scheduled);  in alloc_worker()
2075 		INIT_LIST_HEAD(&worker->node);  in alloc_worker()
2077 		worker->flags = WORKER_PREP;  in alloc_worker()
2079 	return worker;  in alloc_worker()
2099 static void worker_attach_to_pool(struct worker *worker,  in worker_attach_to_pool()  argument
2110 		worker->flags |= WORKER_UNBOUND;  in worker_attach_to_pool()
2112 		kthread_set_per_cpu(worker->task, pool->cpu);  in worker_attach_to_pool()
2114 	if (worker->rescue_wq)  in worker_attach_to_pool()
2115 		set_cpus_allowed_ptr(worker->task, pool_allowed_cpus(pool));  in worker_attach_to_pool()
2117 	list_add_tail(&worker->node, &pool->workers);  in worker_attach_to_pool()
2118 	worker->pool = pool;  in worker_attach_to_pool()
2131 static void worker_detach_from_pool(struct worker *worker)  in worker_detach_from_pool()  argument
2133 	struct worker_pool *pool = worker->pool;  in worker_detach_from_pool()
2138 	kthread_set_per_cpu(worker->task, -1);  in worker_detach_from_pool()
2139 	list_del(&worker->node);  in worker_detach_from_pool()
2140 	worker->pool = NULL;  in worker_detach_from_pool()
2147 	worker->flags &= ~(WORKER_UNBOUND | WORKER_REBOUND);  in worker_detach_from_pool()
2165 static struct worker *create_worker(struct worker_pool *pool)  in create_worker()
2167 	struct worker *worker;  in create_worker()  local
2179 	worker = alloc_worker(pool->node);  in create_worker()
2180 	if (!worker) {  in create_worker()
2185 	worker->id = id;  in create_worker()
2193 	worker->task = kthread_create_on_node(worker_thread, worker, pool->node,  in create_worker()
2195 	if (IS_ERR(worker->task)) {  in create_worker()
2196 		if (PTR_ERR(worker->task) == -EINTR) {  in create_worker()
2201 				    worker->task);  in create_worker()
2206 	set_user_nice(worker->task, pool->attrs->nice);  in create_worker()
2207 	kthread_bind_mask(worker->task, pool_allowed_cpus(pool));  in create_worker()
2210 	worker_attach_to_pool(worker, pool);  in create_worker()
2215 	worker->pool->nr_workers++;  in create_worker()
2216 	worker_enter_idle(worker);  in create_worker()
2224 	wake_up_process(worker->task);  in create_worker()
2228 	return worker;  in create_worker()
2232 	kfree(worker);  in create_worker()
2236 static void unbind_worker(struct worker *worker)  in unbind_worker()  argument
2240 	kthread_set_per_cpu(worker->task, -1);  in unbind_worker()
2242 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, wq_unbound_cpumask) < 0);  in unbind_worker()
2244 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, cpu_possible_mask) < 0);  in unbind_worker()
2249 	struct worker *worker, *tmp;  in wake_dying_workers()  local
2251 	list_for_each_entry_safe(worker, tmp, cull_list, entry) {  in wake_dying_workers()
2252 		list_del_init(&worker->entry);  in wake_dying_workers()
2253 		unbind_worker(worker);  in wake_dying_workers()
2264 		wake_up_process(worker->task);  in wake_dying_workers()
2279 static void set_worker_dying(struct worker *worker, struct list_head *list)  in set_worker_dying()  argument
2281 	struct worker_pool *pool = worker->pool;  in set_worker_dying()
2287 	if (WARN_ON(worker->current_work) ||  in set_worker_dying()
2288 	    WARN_ON(!list_empty(&worker->scheduled)) ||  in set_worker_dying()
2289 	    WARN_ON(!(worker->flags & WORKER_IDLE)))  in set_worker_dying()
2295 	worker->flags |= WORKER_DIE;  in set_worker_dying()
2297 	list_move(&worker->entry, list);  in set_worker_dying()
2298 	list_move(&worker->node, &pool->dying_workers);  in set_worker_dying()
2322 		struct worker *worker;  in idle_worker_timeout()  local
2326 		worker = list_entry(pool->idle_list.prev, struct worker, entry);  in idle_worker_timeout()
2327 		expires = worker->last_active + IDLE_WORKER_TIMEOUT;  in idle_worker_timeout()
2365 		struct worker *worker;  in idle_cull_fn()  local
2368 		worker = list_entry(pool->idle_list.prev, struct worker, entry);  in idle_cull_fn()
2369 		expires = worker->last_active + IDLE_WORKER_TIMEOUT;  in idle_cull_fn()
2376 		set_worker_dying(worker, &cull_list);  in idle_cull_fn()
2504 static bool manage_workers(struct worker *worker)  in manage_workers()  argument
2506 	struct worker_pool *pool = worker->pool;  in manage_workers()
2512 	pool->manager = worker;  in manage_workers()
2536 static void process_one_work(struct worker *worker, struct work_struct *work)  in process_one_work()  argument
2541 	struct worker_pool *pool = worker->pool;  in process_one_work()
2561 	hash_add(pool->busy_hash, &worker->hentry, (unsigned long)work);  in process_one_work()
2562 	worker->current_work = work;  in process_one_work()
2563 	worker->current_func = work->func;  in process_one_work()
2564 	worker->current_pwq = pwq;  in process_one_work()
2565 	worker->current_at = worker->task->se.sum_exec_runtime;  in process_one_work()
2567 	worker->current_color = get_work_color(work_data);  in process_one_work()
2573 	strscpy(worker->desc, pwq->wq->name, WORKER_DESC_LEN);  in process_one_work()
2584 		worker_set_flags(worker, WORKER_CPU_INTENSIVE);  in process_one_work()
2630 	worker->current_func(work);  in process_one_work()
2635 	trace_workqueue_execute_end(work, worker->current_func);  in process_one_work()
2644 		       worker->current_func);  in process_one_work()
2666 	worker_clr_flags(worker, WORKER_CPU_INTENSIVE);  in process_one_work()
2669 	worker->last_func = worker->current_func;  in process_one_work()
2672 	hash_del(&worker->hentry);  in process_one_work()
2673 	worker->current_work = NULL;  in process_one_work()
2674 	worker->current_func = NULL;  in process_one_work()
2675 	worker->current_pwq = NULL;  in process_one_work()
2676 	worker->current_color = INT_MAX;  in process_one_work()
2692 static void process_scheduled_works(struct worker *worker)  in process_scheduled_works()  argument
2697 	while ((work = list_first_entry_or_null(&worker->scheduled,  in process_scheduled_works()
2700 			worker->pool->watchdog_ts = jiffies;  in process_scheduled_works()
2703 		process_one_work(worker, work);  in process_scheduled_works()
2731 	struct worker *worker = __worker;  in worker_thread()  local
2732 	struct worker_pool *pool = worker->pool;  in worker_thread()
2740 	if (unlikely(worker->flags & WORKER_DIE)) {  in worker_thread()
2744 		set_task_comm(worker->task, "kworker/dying");  in worker_thread()
2745 		ida_free(&pool->worker_ida, worker->id);  in worker_thread()
2746 		worker_detach_from_pool(worker);  in worker_thread()
2747 		WARN_ON_ONCE(!list_empty(&worker->entry));  in worker_thread()
2748 		kfree(worker);  in worker_thread()
2752 	worker_leave_idle(worker);  in worker_thread()
2759 	if (unlikely(!may_start_working(pool)) && manage_workers(worker))  in worker_thread()
2767 	WARN_ON_ONCE(!list_empty(&worker->scheduled));  in worker_thread()
2776 	worker_clr_flags(worker, WORKER_PREP | WORKER_REBOUND);  in worker_thread()
2783 		if (assign_work(work, worker, NULL))  in worker_thread()
2784 			process_scheduled_works(worker);  in worker_thread()
2787 	worker_set_flags(worker, WORKER_PREP);  in worker_thread()
2796 	worker_enter_idle(worker);  in worker_thread()
2826 	struct worker *rescuer = __rescuer;  in rescuer_thread()
2953 	struct worker *worker;  in check_flush_dependency()  local
2958 	worker = current_wq_worker();  in check_flush_dependency()
2963 	WARN_ONCE(worker && ((worker->current_pwq->wq->flags &  in check_flush_dependency()
2966 		  worker->current_pwq->wq->name, worker->current_func,  in check_flush_dependency()
3008 			      struct work_struct *target, struct worker *worker)  in insert_wq_barrier()  argument
3034 	if (worker) {  in insert_wq_barrier()
3035 		head = worker->scheduled.next;  in insert_wq_barrier()
3036 		work_color = worker->current_color;  in insert_wq_barrier()
3340 	struct worker *worker = NULL;  in start_flush_work()  local
3360 		worker = find_worker_executing_work(pool, work);  in start_flush_work()
3361 		if (!worker)  in start_flush_work()
3363 		pwq = worker->current_pwq;  in start_flush_work()
3368 	insert_wq_barrier(pwq, barr, work, worker);  in start_flush_work()
3961 	struct worker *worker;  in put_unbound_pool()  local
4007 	while ((worker = first_idle_worker(pool)))  in put_unbound_pool()
4008 		set_worker_dying(worker, &cull_list);  in put_unbound_pool()
4641 	struct worker *rescuer;  in init_rescuer()
4807 		struct worker *rescuer = wq->rescuer;  in destroy_workqueue()
4910 	struct worker *worker = current_wq_worker();  in current_work()  local
4912 	return worker ? worker->current_work : NULL;  in current_work()
4926 	struct worker *worker = current_wq_worker();  in current_is_workqueue_rescuer()  local
4928 	return worker && worker->rescue_wq;  in current_is_workqueue_rescuer()
5017 	struct worker *worker = current_wq_worker();  in set_worker_desc()  local
5020 	if (worker) {  in set_worker_desc()
5022 		vsnprintf(worker->desc, sizeof(worker->desc), fmt, args);  in set_worker_desc()
5048 	struct worker *worker;  in print_worker_info()  local
5057 	worker = kthread_probe_data(task);  in print_worker_info()
5063 	copy_from_kernel_nofault(&fn, &worker->current_func, sizeof(fn));  in print_worker_info()
5064 	copy_from_kernel_nofault(&pwq, &worker->current_pwq, sizeof(pwq));  in print_worker_info()
5067 	copy_from_kernel_nofault(desc, worker->desc, sizeof(desc) - 1);  in print_worker_info()
5134 	struct worker *worker;  in show_pwq()  local
5145 	hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_pwq()
5146 		if (worker->current_pwq == pwq) {  in show_pwq()
5155 		hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_pwq()
5156 			if (worker->current_pwq != pwq)  in show_pwq()
5160 				task_pid_nr(worker->task),  in show_pwq()
5161 				worker->rescue_wq ? "(RESCUER)" : "",  in show_pwq()
5162 				worker->current_func);  in show_pwq()
5163 			list_for_each_entry(work, &worker->scheduled, entry)  in show_pwq()
5255 	struct worker *worker;  in show_one_worker_pool()  local
5280 	list_for_each_entry(worker, &pool->idle_list, entry) {  in show_one_worker_pool()
5282 			task_pid_nr(worker->task));  in show_one_worker_pool()
5359 		struct worker *worker = kthread_data(task);  in wq_worker_comm()  local
5360 		struct worker_pool *pool = worker->pool;  in wq_worker_comm()
5369 			if (worker->desc[0] != '\0') {  in wq_worker_comm()
5370 				if (worker->current_work)  in wq_worker_comm()
5372 						  worker->desc);  in wq_worker_comm()
5375 						  worker->desc);  in wq_worker_comm()
5404 	struct worker *worker;  in unbind_workers()  local
5418 		for_each_pool_worker(worker, pool)  in unbind_workers()
5419 			worker->flags |= WORKER_UNBOUND;  in unbind_workers()
5442 		for_each_pool_worker(worker, pool)  in unbind_workers()
5443 			unbind_worker(worker);  in unbind_workers()
5457 	struct worker *worker;  in rebind_workers()  local
5468 	for_each_pool_worker(worker, pool) {  in rebind_workers()
5469 		kthread_set_per_cpu(worker->task, pool->cpu);  in rebind_workers()
5470 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task,  in rebind_workers()
5478 	for_each_pool_worker(worker, pool) {  in rebind_workers()
5479 		unsigned int worker_flags = worker->flags;  in rebind_workers()
5499 		WRITE_ONCE(worker->flags, worker_flags);  in rebind_workers()
5518 	struct worker *worker;  in restore_unbound_workers_cpumask()  local
5529 	for_each_pool_worker(worker, pool)  in restore_unbound_workers_cpumask()
5530 		WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, &cpumask) < 0);  in restore_unbound_workers_cpumask()
6337 	struct worker *worker;  in show_cpu_pool_hog()  local
6343 	hash_for_each(pool->busy_hash, bkt, worker, hentry) {  in show_cpu_pool_hog()
6344 		if (task_is_running(worker->task)) {  in show_cpu_pool_hog()
6353 			sched_show_task(worker->task);  in show_cpu_pool_hog()