diff options
| author | Stefano Garzarella <sgarzare@redhat.com> | 2020-05-15 18:38:05 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-05-15 12:16:59 -0600 |
| commit | 7e55a19cf6e70ce08964b46dbbfbdb07fbc995fc (patch) | |
| tree | c3c822bc6a855e22fa9d1092f7670eb4a1b59274 | |
| parent | 0d9b5b3af134cddfdc1dd31d41946a0ad389bbf2 (diff) | |
| download | lwn-7e55a19cf6e70ce08964b46dbbfbdb07fbc995fc.tar.gz lwn-7e55a19cf6e70ce08964b46dbbfbdb07fbc995fc.zip | |
io_uring: add IORING_CQ_EVENTFD_DISABLED to the CQ ring flags
This new flag should be set/clear from the application to
disable/enable eventfd notifications when a request is completed
and queued to the CQ ring.
Before this patch, notifications were always sent if an eventfd is
registered, so IORING_CQ_EVENTFD_DISABLED is not set during the
initialization.
It will be up to the application to set the flag after initialization
if no notifications are required at the beginning.
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | fs/io_uring.c | 2 | ||||
| -rw-r--r-- | include/uapi/linux/io_uring.h | 7 |
2 files changed, 9 insertions, 0 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 02250693a406..f800b0b4498f 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1153,6 +1153,8 @@ static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) { if (!ctx->cq_ev_fd) return false; + if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) + return false; if (!ctx->eventfd_async) return true; return io_wq_current_is_worker(); diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 602bb0ece607..8c5775df08b8 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -210,6 +210,13 @@ struct io_cqring_offsets { }; /* + * cq_ring->flags + */ + +/* disable eventfd notifications */ +#define IORING_CQ_EVENTFD_DISABLED (1U << 0) + +/* * io_uring_enter(2) flags */ #define IORING_ENTER_GETEVENTS (1U << 0) |