io_uring: don't burn CPU for iopoll on exit

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First of all don't spin in io_ring_ctx_wait_and_kill() on iopoll.
Requests won't complete faster because of that, but only lengthen
io_uring_release().

The same goes for offloaded cleanup in io_ring_exit_work() -- it
already has waiting loop, don't do blocking active spinning.

For that, pass min=0 into io_iopoll_[try_]reap_events(), so it won't
actively spin. Leave the function if io_do_iopoll() there can't
complete a request to sleep in io_ring_exit_work().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2020-07-07 16:36:22 +03:00 • committed by Jens Axboe

parent 7668b92a69

commit b2edc0a77f

1 changed files with 11 additions and 12 deletions

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fs/io_uring.c

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