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| author | Stefan Roesch <shr@fb.com> | 2022-06-16 14:22:19 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-07-24 18:39:32 -0600 |
| commit | 1c849b481b3e4f8c36f297cd3aa88ef52a19cee9 (patch) | |
| tree | 9a9e425148c5837aa780ac99d4f10d4cb72caba4 /io_uring/rw.c | |
| parent | e053aaf4da56cbf0afb33a0fda4a62188e2c0637 (diff) | |
| download | lwn-1c849b481b3e4f8c36f297cd3aa88ef52a19cee9.tar.gz lwn-1c849b481b3e4f8c36f297cd3aa88ef52a19cee9.zip | |
io_uring: Add tracepoint for short writes
This adds the io_uring_short_write tracepoint to io_uring. A short write
is issued if not all pages that are required for a write are in the page
cache and the async buffered writes have to return EAGAIN.
Signed-off-by: Stefan Roesch <shr@fb.com>
Link: https://lore.kernel.org/r/20220616212221.2024518-13-shr@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/rw.c')
| -rw-r--r-- | io_uring/rw.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/io_uring/rw.c b/io_uring/rw.c index 1f4a8ff98254..2b784795103c 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -933,6 +933,9 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags) if (ret2 != req->cqe.res && ret2 >= 0 && need_complete_io(req)) { struct io_async_rw *rw; + trace_io_uring_short_write(req->ctx, kiocb->ki_pos - ret2, + req->cqe.res, ret2); + /* This is a partial write. The file pos has already been * updated, setup the async struct to complete the request * in the worker. Also update bytes_done to account for |