io_uring: only plug when appropriate

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We unconditionally call blk_start_plug() when starting the IO
submission, but we only really should do that if we have more than 1
request to submit AND we're potentially dealing with block based storage
underneath. For any other type of request, it's just a waste of time to
do so.

Add a ->plug bit to io_op_def and set it for read/write requests. We
could make this more precise and check the file itself as well, but it
doesn't matter that much and would quickly become more expensive.

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

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Jens Axboe 2020-10-28 09:33:23 -06:00

parent 0415767e7f

commit 27926b683d

1 changed files with 23 additions and 2 deletions

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fs/io_uring.c

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