io_uring: optimise mutex locking for submit+iopoll

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Both submittion and iopolling requires holding uring_lock. IOPOLL can
users do them together in a single syscall, however it would still do 2
pairs of lock/unlock. Optimise this case combining locking into one
lock/unlock pair, which especially nice for low QD.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/034b6c41658648ad3ad3c9485ac8eb546f010bc4.1647957378.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2022-03-22 14:07:58 +00:00 • committed by Jens Axboe

parent 773697b610

commit d487b43cd3

1 changed files with 23 additions and 17 deletions

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fs/io_uring.c

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