Commit 78848b9b authored by Jens Axboe's avatar Jens Axboe
Browse files

io_uring/io-wq: don't grab wq->lock for worker activation 



The worker free list is RCU protected, and checks for workers going away
when iterating it. There's no need to hold the wq->lock around the
lookup.

Reviewed-by: default avatarHao Xu <howeyxu@tencent.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 89226307

io_uring/io-wq.c

+0 −3
Original line number Diff line number Diff line
@@ -909,13 +909,10 @@ void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work) 
	clear_bit(IO_ACCT_STALLED_BIT, &acct->flags);

	raw_spin_unlock(&acct->lock);



	raw_spin_lock(&wq->lock);

	rcu_read_lock();

	do_create = !io_wq_activate_free_worker(wq, acct);

	rcu_read_unlock();



	raw_spin_unlock(&wq->lock);



	if (do_create && ((work_flags & IO_WQ_WORK_CONCURRENT) ||

	    !atomic_read(&acct->nr_running))) {

		bool did_create;