io_uring: memcpy CQE from req

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We can do CQE filling a bit more efficiently when req->cqe is fully
filled by memcpy()'ing it to the userspace instead of doing it field by
field. It's easier on register spilling, removes a couple of extra
loads/stores and write combines two u32 memory writes.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ee3f514ff28b1fe3347a8eca93a9d91647f2eaad.1649771823.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2022-04-12 15:09:44 +01:00 • committed by Jens Axboe

parent cef216fc32

commit 90e7c35fb8

1 changed files with 23 additions and 1 deletions

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fs/io_uring.c

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