io_uring: add POLL_FIRST support for send/sendmsg and recv/recvmsg

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If IORING_RECVSEND_POLL_FIRST is set for recv/recvmsg or send/sendmsg,
then we arm poll first rather than attempt a receive or send upfront.
This can be useful if we expect there to be no data (or space) available
for the request, as we can then avoid wasting time on the initial
issue attempt.

Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Jens Axboe 2022-04-26 12:11:33 -06:00

parent 73911426aa

commit 0455d4ccec

2 changed files with 35 additions and 2 deletions

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27

fs/io_uring.c

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10

include/uapi/linux/io_uring.h

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