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authorPavel Begunkov <asml.silence@gmail.com>2020-01-28 03:15:48 +0300
committerJens Axboe <axboe@kernel.dk>2020-01-28 17:44:41 -0700
commit24369c2e3bb06d8c4e71fd6ceaf4f8a01ae79b7c (patch)
tree85a855b36b34647dd7b360635f2535545294afd8 /include
parenteba6f5a330cf042bb0001f0b5e8cbf21be1b25d6 (diff)
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')
-rw-r--r--include/uapi/linux/io_uring.h4
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;
};