io_uring: add IOSQE_ASYNC

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io_uring defaults to always doing inline submissions, if at all
possible. But for larger copies, even if the data is fully cached, that
can take a long time. Add an IOSQE_ASYNC flag that the application can
set on the SQE - if set, it'll ensure that we always go async for those
kinds of requests. Use the io-wq IO_WQ_WORK_CONCURRENT flag to ensure we
get the concurrency we desire for this case.

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

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This commit is contained in:

Jens Axboe 2019-12-17 08:04:44 -07:00

parent 895e2ca0f6

commit ce35a47a3a

2 changed files with 15 additions and 2 deletions

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16

fs/io_uring.c

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1

include/uapi/linux/io_uring.h

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