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io_uring: Add tracepoint for short writes

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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>
This commit is contained in:
Stefan Roesch 2022-06-16 14:22:19 -07:00 committed by Jens Axboe
parent f17ff93267
commit fb53fa51df
2 changed files with 28 additions and 0 deletions
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25
include/trace/events/io_uring.h
View File

@ -630,6 +630,31 @@ TRACE_EVENT(io_uring_task_work_run,
__entry->tctx, __entry->count, __entry->loops)
);
TRACE_EVENT(io_uring_short_write,
TP_PROTO(void *ctx, u64 fpos, u64 wanted, u64 got),
TP_ARGS(ctx, fpos, wanted, got),
TP_STRUCT__entry(
__field(void *, ctx)
__field(u64, fpos)
__field(u64, wanted)
__field(u64, got)
),
TP_fast_assign(
__entry->ctx = ctx;
__entry->fpos = fpos;
__entry->wanted = wanted;
__entry->got = got;
),
TP_printk("ring %p, fpos %lld, wanted %lld, got %lld",
__entry->ctx, __entry->fpos,
__entry->wanted, __entry->got)
);
#endif /* _TRACE_IO_URING_H */
/* This part must be outside protection */

3
io_uring/rw.c
View File

@ -937,6 +937,9 @@ 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