io_uring: optimise task_work submit flushing

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tctx_task_work() tries to fetch a next batch of requests, but before it
would flush completions from the previous batch that may be sub-optimal.
E.g. io_req_task_queue() executes a head of the link where all the
linked may be enqueued through the same io_req_task_queue(). And there
are more cases for that.

Do the flushing at the end, so it can cache completions of several waves
of a single tctx_task_work(), and do the flush at the very end.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3cac83934e4fbce520ff8025c3524398b3ae0270.1623949695.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2021-06-17 18:14:07 +01:00 • committed by Jens Axboe

parent 3f18407dc6

commit ebd0df2e63

1 changed files with 3 additions and 2 deletions

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fs/io_uring.c

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