From 1c849b481b3e4f8c36f297cd3aa88ef52a19cee9 Mon Sep 17 00:00:00 2001 From: Stefan Roesch Date: Thu, 16 Jun 2022 14:22:19 -0700 Subject: 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 Link: https://lore.kernel.org/r/20220616212221.2024518-13-shr@fb.com Signed-off-by: Jens Axboe --- io_uring/rw.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'io_uring/rw.c') 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 -- cgit v1.2.3