io_uring: use system_unbound_wq for ring exit work (fc666777) · Commits · 戴 / test

We currently use system_wq, which is unbounded in terms of number of workers. This means that if we're exiting tons of rings at the same time, then we'll briefly spawn tons of event kworkers just for a very short blocking time as the rings exit. Use system_unbound_wq instead, which has a sane cap on the concurrency level. Signed-off-by:

Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -7960,7 +7960,13 @@ static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
		ACCT_LOCKED);

		INIT_WORK(&ctx->exit_work, io_ring_exit_work);
		queue_work(system_wq, &ctx->exit_work);
		/*
		* Use system_unbound_wq to avoid spawning tons of event kworkers
		* if we're exiting a ton of rings at the same time. It just adds
		* noise and overhead, there's no discernable change in runtime
		* over using system_wq.
		*/
		queue_work(system_unbound_wq, &ctx->exit_work);
		}

		static int io_uring_release(struct inode inode, struct file file)

Admin message