io_uring: optimise SQPOLL mm/files grabbing

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There are two reasons for this. First is to optimise
io_sq_thread_acquire_mm_files() for non-SQPOLL case, which currently do
too many checks and function calls in the hot path, e.g. in
io_init_req().

The second is to not grab mm/files when there are not needed. As
__io_queue_sqe() issues only one request now, we can reuse
io_sq_thread_acquire_mm_files() instead of unconditional acquire
mm/files.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2021-02-12 03:23:52 +00:00 • committed by Jens Axboe

parent d3d7298d05

commit 4e32635834

1 changed files with 13 additions and 14 deletions

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fs/io_uring.c

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