Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
+8
-1
+1
include/uapi/linux/io_uring.h
+1
include/uapi/linux/io_uring.h
+7
-1
io_uring/nop.c
+7
-1
io_uring/nop.c
···
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};
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#define NOP_FLAGS (IORING_NOP_INJECT_RESULT | IORING_NOP_FIXED_FILE | \
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-
IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE)
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+
IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE | \
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IORING_NOP_TW)
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int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
···
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if (ret < 0)
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req_set_fail(req);
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io_req_set_res(req, nop->result, 0);
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+
if (nop->flags & IORING_NOP_TW) {
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req->io_task_work.func = io_req_task_complete;
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io_req_task_work_add(req);
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return IOU_ISSUE_SKIP_COMPLETE;
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}
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return IOU_COMPLETE;
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}