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authorJens Axboe <axboe@kernel.dk>2019-12-07 21:03:59 -0700
committerJens Axboe <axboe@kernel.dk>2019-12-10 16:33:22 -0700
commit506d95ff5d6aa0a099a116c49d3884e29801d843 (patch)
treeaf3a2a77e277a3ad4cda2075dfd70827e468c47e /fs/io-wq.c
parent4e88d6e7793f2f445f43bd608828541d7f43b608 (diff)
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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>
Diffstat (limited to 'fs/io-wq.c')
-rw-r--r--fs/io-wq.c10
1 files changed, 2 insertions, 8 deletions
diff --git a/fs/io-wq.c b/fs/io-wq.c
index 74b40506c5d9..6b663ddceb42 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -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);