Re: [PATCH] io_uring: remove wait loop spurious wakeups

[Jens Axboe]

On 10/7/19 5:18 PM, Pavel Begunkov (Silence) wrote:
> From: Pavel Begunkov <asml.silence@xxxxxxxxx>
> 
> Any changes interesting to tasks waiting in io_cqring_wait() are
> commited with io_cqring_ev_posted(). However, io_ring_drop_ctx_refs()
> also tries to do that but with no reason, that means spurious wakeups
> every io_free_req() and io_uring_enter().
> 
> Just use percpu_ref_put() instead.

Looks good, this is a leftover from when the ctx teardown used
the waitqueue as well.

-- 
Jens Axboe