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| author |   Jens Axboe <axboe@kernel.dk> | 2020-01-08 11:04:00 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-01-20 17:04:04 -0700 |
| commit | f2842ab5b72d7ee5f7f8385c2d4f32c133f5837b (patch) | |
| tree | 02731be82d19be0a9793ab1cb2ccd957c6f021b8 /include/uapi | |
| parent | io_uring: change io_ring_ctx bool fields into bit fields (diff) | |
| download | linux-dev-f2842ab5b72d7ee5f7f8385c2d4f32c133f5837b.tar.xz linux-dev-f2842ab5b72d7ee5f7f8385c2d4f32c133f5837b.zip | |
io_uring: enable option to only trigger eventfd for async completions
If an application is using eventfd notifications with poll to know when
new SQEs can be issued, it's expecting the following read/writes to
complete inline. And with that, it knows that there are events available,
and don't want spurious wakeups on the eventfd for those requests.
This adds IORING_REGISTER_EVENTFD_ASYNC, which works just like
IORING_REGISTER_EVENTFD, except it only triggers notifications for events
that happen from async completions (IRQ, or io-wq worker completions).
Any completions inline from the submission itself will not trigger
notifications.
Suggested-by: Mark Papadakis <markuspapadakis@icloud.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/io_uring.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 0fe270ab191c..66772a90a7f2 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -192,6 +192,7 @@ struct io_uring_params { #define IORING_REGISTER_EVENTFD 4 #define IORING_UNREGISTER_EVENTFD 5 #define IORING_REGISTER_FILES_UPDATE 6 +#define IORING_REGISTER_EVENTFD_ASYNC 7 struct io_uring_files_update { __u32 offset; |