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io-wq: remove worker->wait waitqueue 

We only have one cases of using the waitqueue to wake the worker, the
rest are using wake_up_process(). Since we can save some cycles not
fiddling with the waitqueue io_wqe_worker(), switch the work activation
to task wakeup and get rid of the now unused wait_queue_head_t in
struct io_worker.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-12-07 21:03:59 -07:00
parent 4e88d6e779
commit 506d95ff5d
1 changed files with 2 additions and 8 deletions
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10
fs/io-wq.c
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@ -49,7 +49,6 @@ struct io_worker {
struct hlist_nulls_node nulls_node;
struct list_head all_list;
struct task_struct *task;
wait_queue_head_t wait;
struct io_wqe *wqe;
struct io_wq_work *cur_work;
@ -258,7 +257,7 @@ static bool io_wqe_activate_free_worker(struct io_wqe *wqe)
worker = hlist_nulls_entry(n, struct io_worker, nulls_node);
if (io_worker_get(worker)) {
wake_up(&worker->wait);
wake_up_process(worker->task);
io_worker_release(worker);
return true;
}
@ -497,13 +496,11 @@ static int io_wqe_worker(void *data)
struct io_worker *worker = data;
struct io_wqe *wqe = worker->wqe;
struct io_wq *wq = wqe->wq;
DEFINE_WAIT(wait);
io_worker_start(wqe, worker);
while (!test_bit(IO_WQ_BIT_EXIT, &wq->state)) {
prepare_to_wait(&worker->wait, &wait, TASK_INTERRUPTIBLE);
set_current_state(TASK_INTERRUPTIBLE);
spin_lock_irq(&wqe->lock);
if (io_wqe_run_queue(wqe)) {
__set_current_state(TASK_RUNNING);
@ -526,8 +523,6 @@ static int io_wqe_worker(void *data)
break;
}
finish_wait(&worker->wait, &wait);
if (test_bit(IO_WQ_BIT_EXIT, &wq->state)) {
spin_lock_irq(&wqe->lock);
if (!wq_list_empty(&wqe->work_list))
@ -589,7 +584,6 @@ static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
refcount_set(&worker->ref, 1);
worker->nulls_node.pprev = NULL;
init_waitqueue_head(&worker->wait);
worker->wqe = wqe;
spin_lock_init(&worker->lock);