io_uring: allow io-wq workers to exit when unused

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commit 9121466148 upstream.

io_uring keeps a per-task io-wq around, even when the task no longer has
any io_uring instances.

If the task previously used io_uring for file I/O, this can leave an
unrelated iou-wrk-* worker thread behind after the last io_uring
instance is gone.

When the last io_uring ctx is removed from the task context, mark the
io-wq exit-on-idle so workers can go away. Clear the flag on subsequent
io_uring usage.

Signed-off-by: Li Chen <me@linux.beauty>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Li Chen 2026-02-02 22:37:54 +08:00 • committed by Greg Kroah-Hartman

parent 4bdf66464b

commit 81ea0ab0c0

1 changed files with 11 additions and 0 deletions

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io_uring/tctx.c

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