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io_uring/nop: add IORING_NOP_TW completion flag

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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>
This commit is contained in:
Jens Axboe 2025-06-13 17:05:19 -06:00
parent ecf47d452c
commit cb9ccfb404
2 changed files with 8 additions and 1 deletions
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1
include/uapi/linux/io_uring.h
View file

@ -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)

8
io_uring/nop.c
View file

@ -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;
}