io_uring: optimise completion timeout flushing
io_commit_cqring() might be very hot and we definitely don't want to touch ->timeout_list there, because 1) it's shared with the submission side so might lead to cache bouncing and 2) may need to load an extra cache line, especially for IRQ completions. We're interested in it at the completion side only when there are offset-mode timeouts, which are not so popular. Replace list_empty(->timeout_list) hot path check with a new one-way flag, which is set when we prepare the first offset-mode timeout. note: the flag sits in the same line as briefly used after ->rings Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/e4892ec68b71a69f92ffbea4a1499be3ec0d463b.1623709150.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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