Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx> --- man/io_uring_setup.2 | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/man/io_uring_setup.2 b/man/io_uring_setup.2 index 75c69ff..0f57d8f 100644 --- a/man/io_uring_setup.2 +++ b/man/io_uring_setup.2 @@ -239,6 +239,24 @@ variant. This is a requirement for using certain request types, as of 5.19 only the .B IORING_OP_URING_CMD passthrough command for NVMe passthrough needs this. Available since 5.19. +.TP +.B IORING_SETUP_SINGLE_ISSUER +A hint to the kernel that only a single task can submit requests, which is used +for internal optimisations. The kernel enforces the rule, which only affects +.I +io_uring_enter(2) +calls submitting requests and will fail them with +.B -EEXIST +if the restriction is violated. +The submitter task may differ from the task that created the ring. +Note that when +.B IORING_SETUP_SQPOLL +is set it is considered that the polling task is doing all submissions +on behalf of the userspace and so it always complies with the rule disregarding +how many userspace tasks do +.I +io_uring_enter(2). +Available since 5.20. .PP If no flags are specified, the io_uring instance is setup for interrupt driven I/O. I/O may be submitted using -- 2.37.0
