io_uring: replace use of system_wq with system_percpu_wq

Currently if a user enqueue a work item using schedule_delayed_work() the
used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use
WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to
schedule_work() that is using system_wq and queue_work(), that makes use
again of WORK_CPU_UNBOUND.

This lack of consistentcy cannot be addressed without refactoring the API.

system_wq is a per-CPU worqueue, yet nothing in its name tells about that
CPU affinity constraint, which is very often not required by users. Make
it clear by adding a system_percpu_wq.

queue_work() / queue_delayed_work() mod_delayed_work() will now use the
new per-cpu wq: whether the user still stick on the old name a warn will
be printed along a wq redirect to the new one.

This patch add the new system_percpu_wq except for mm, fs and net
subsystem, whom are handled in separated patches.

The old wq will be kept for a few release cylces.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 3474038624875c93e30d46e42165679b93985fe6..6fc5defcb15621b7e8eeb4e2dbf1a8f422385f2c 100644 (file)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3106,7 +3106,7 @@ static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
         * 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.
+        * over using system_percpu_wq.
         */
        queue_work(iou_wq, &ctx->exit_work);
 }