io_uring: be smarter about waking multiple CQ ring waiters

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Currently we only wake the first waiter, even if we have enough entries
posted to satisfy multiple waiters. Improve that situation so that
every waiter knows how much the CQ tail has to advance before they can
be safely woken up.

With this change, if we have N waiters each asking for 1 event and we get
4 completions, then we wake up 4 waiters. If we have N waiters asking
for 2 completions and we get 4 completions, then we wake up the first
two. Previously, only the first waiter would've been woken up.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Jens Axboe 2021-08-06 14:04:31 -06:00

parent d3e9f732c4

commit 5fd4617840

1 changed files with 13 additions and 14 deletions

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fs/io_uring.c

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