diff options
Diffstat (limited to 'kernel/workqueue.c')
| -rw-r--r-- | kernel/workqueue.c | 41 |
1 files changed, 15 insertions, 26 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 794724efb733..cdc6bfc84b78 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -73,11 +73,10 @@ enum { WORKER_DIE = 1 << 1, /* die die die */ WORKER_IDLE = 1 << 2, /* is idle */ WORKER_PREP = 1 << 3, /* preparing to run works */ - WORKER_REBIND = 1 << 5, /* mom is home, come back */ WORKER_CPU_INTENSIVE = 1 << 6, /* cpu intensive */ WORKER_UNBOUND = 1 << 7, /* worker is unbound */ - WORKER_NOT_RUNNING = WORKER_PREP | WORKER_REBIND | WORKER_UNBOUND | + WORKER_NOT_RUNNING = WORKER_PREP | WORKER_UNBOUND | WORKER_CPU_INTENSIVE, NR_WORKER_POOLS = 2, /* # worker pools per gcwq */ @@ -1618,20 +1617,15 @@ __acquires(&gcwq->lock) /* * Rebind an idle @worker to its CPU. worker_thread() will test - * %WORKER_REBIND before leaving idle and call this function. + * list_empty(@worker->entry) before leaving idle and call this function. */ static void idle_worker_rebind(struct worker *worker) { struct global_cwq *gcwq = worker->pool->gcwq; - /* - * CPU may go down again inbetween. If rebinding fails, reinstate - * UNBOUND. We're off idle_list and nobody else can do it for us. - */ - if (!worker_maybe_bind_and_lock(worker)) - worker->flags |= WORKER_UNBOUND; - - worker_clr_flags(worker, WORKER_REBIND); + /* CPU may go down again inbetween, clear UNBOUND only on success */ + if (worker_maybe_bind_and_lock(worker)) + worker_clr_flags(worker, WORKER_UNBOUND); /* rebind complete, become available again */ list_add(&worker->entry, &worker->pool->idle_list); @@ -1689,16 +1683,9 @@ static void rebind_workers(struct global_cwq *gcwq) for_each_worker_pool(pool, gcwq) lockdep_assert_held(&pool->manager_mutex); - /* set REBIND and kick idle ones */ + /* dequeue and kick idle ones */ for_each_worker_pool(pool, gcwq) { list_for_each_entry_safe(worker, n, &pool->idle_list, entry) { - unsigned long worker_flags = worker->flags; - - /* morph UNBOUND to REBIND atomically */ - worker_flags &= ~WORKER_UNBOUND; - worker_flags |= WORKER_REBIND; - ACCESS_ONCE(worker->flags) = worker_flags; - /* * idle workers should be off @pool->idle_list * until rebind is complete to avoid receiving @@ -1706,7 +1693,10 @@ static void rebind_workers(struct global_cwq *gcwq) */ list_del_init(&worker->entry); - /* worker_thread() will call idle_worker_rebind() */ + /* + * worker_thread() will see the above dequeuing + * and call idle_worker_rebind(). + */ wake_up_process(worker->task); } } @@ -2176,7 +2166,7 @@ __acquires(&gcwq->lock) * necessary to avoid spurious warnings from rescuers servicing the * unbound or a disassociated gcwq. */ - WARN_ON_ONCE(!(worker->flags & (WORKER_UNBOUND | WORKER_REBIND)) && + WARN_ON_ONCE(!(worker->flags & WORKER_UNBOUND) && !(gcwq->flags & GCWQ_DISASSOCIATED) && raw_smp_processor_id() != gcwq->cpu); @@ -2300,18 +2290,17 @@ static int worker_thread(void *__worker) woke_up: spin_lock_irq(&gcwq->lock); - /* - * DIE can be set only while idle and REBIND set while busy has - * @worker->rebind_work scheduled. Checking here is enough. - */ - if (unlikely(worker->flags & (WORKER_REBIND | WORKER_DIE))) { + /* we are off idle list if destruction or rebind is requested */ + if (unlikely(list_empty(&worker->entry))) { spin_unlock_irq(&gcwq->lock); + /* if DIE is set, destruction is requested */ if (worker->flags & WORKER_DIE) { worker->task->flags &= ~PF_WQ_WORKER; return 0; } + /* otherwise, rebind */ idle_worker_rebind(worker); goto woke_up; } |