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| author |   Pavel Begunkov <asml.silence@gmail.com> | 2020-01-28 03:15:48 +0300 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2020-01-28 17:44:41 -0700 |
| commit | 24369c2e3bb06d8c4e71fd6ceaf4f8a01ae79b7c (patch) | |
| tree | 85a855b36b34647dd7b360635f2535545294afd8 /include/uapi | |
| parent | io-wq: allow grabbing existing io-wq (diff) | |
| download | linux-dev-24369c2e3bb06d8c4e71fd6ceaf4f8a01ae79b7c.tar.xz linux-dev-24369c2e3bb06d8c4e71fd6ceaf4f8a01ae79b7c.zip | |
io_uring: add io-wq workqueue sharing
If IORING_SETUP_ATTACH_WQ is set, it expects wq_fd in io_uring_params to
be a valid io_uring fd io-wq of which will be shared with the newly
created io_uring instance. If the flag is set but it can't share io-wq,
it fails.
This allows creation of "sibling" io_urings, where we prefer to keep the
SQ/CQ private, but want to share the async backend to minimize the amount
of overhead associated with having multiple rings that belong to the same
backend.
Reported-by: Jens Axboe <axboe@kernel.dk>
Reported-by: Daurnimator <quae@daurnimator.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/io_uring.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 9988e82f858b..e067b92af5ad 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -75,6 +75,7 @@ enum { #define IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */ #define IORING_SETUP_CQSIZE (1U << 3) /* app defines CQ size */ #define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */ +#define IORING_SETUP_ATTACH_WQ (1U << 5) /* attach to existing wq */ enum { IORING_OP_NOP, @@ -183,7 +184,8 @@ struct io_uring_params { __u32 sq_thread_cpu; __u32 sq_thread_idle; __u32 features; - __u32 resv[4]; + __u32 wq_fd; + __u32 resv[3]; struct io_sqring_offsets sq_off; struct io_cqring_offsets cq_off; }; |