diff options
| author | Jens Axboe <axboe@kernel.dk> | 2025-06-14 02:05:19 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-06-23 17:59:13 +0300 |
| commit | cb9ccfb404e700dc0db59d68242d79fe386bb3f0 (patch) | |
| tree | f9ace4b4092af8ad5df61665f48572bffca297ea | |
| parent | ecf47d452ced9be162831192fcfb3e9f5cdcde7f (diff) | |
| download | linux-cb9ccfb404e700dc0db59d68242d79fe386bb3f0.tar.xz | |
io_uring/nop: add IORING_NOP_TW completion flag
To test and profile the overhead of io_uring task_work and the various
types of it, add IORING_NOP_TW which tells nop to signal completions
through task_work rather than complete them inline.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/uapi/linux/io_uring.h | 1 | ||||
| -rw-r--r-- | io_uring/nop.c | 8 |
2 files changed, 8 insertions, 1 deletions
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index cfd17e382082..8c3d43caab02 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -449,6 +449,7 @@ enum io_uring_msg_ring_flags { #define IORING_NOP_FILE (1U << 1) #define IORING_NOP_FIXED_FILE (1U << 2) #define IORING_NOP_FIXED_BUFFER (1U << 3) +#define IORING_NOP_TW (1U << 4) /* * IO completion data structure (Completion Queue Entry) diff --git a/io_uring/nop.c b/io_uring/nop.c index 6ac2de761fd3..20ed0f85b1c2 100644 --- a/io_uring/nop.c +++ b/io_uring/nop.c @@ -20,7 +20,8 @@ struct io_nop { }; #define NOP_FLAGS (IORING_NOP_INJECT_RESULT | IORING_NOP_FIXED_FILE | \ - IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE) + IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE | \ + IORING_NOP_TW) int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { @@ -68,5 +69,10 @@ done: if (ret < 0) req_set_fail(req); io_req_set_res(req, nop->result, 0); + if (nop->flags & IORING_NOP_TW) { + req->io_task_work.func = io_req_task_complete; + io_req_task_work_add(req); + return IOU_ISSUE_SKIP_COMPLETE; + } return IOU_COMPLETE; } |