[Qemu-devel] [PATCH 1/3] block/io_uring: add submission and completion trace events

[Stefan Hajnoczi <stefanha@redhat.com>]

It is useful to follow individual requests as they are submitted.  Add
trace events that show details of each request.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/io_uring.c   | 5 +++++
 block/trace-events | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/block/io_uring.c b/block/io_uring.c
index 22e8d3d9ca..19919da4c9 100644
--- a/block/io_uring.c
+++ b/block/io_uring.c
@@ -128,6 +128,8 @@ static void luring_process_completions(LuringState *s)
         LuringAIOCB *luringcb = io_uring_cqe_get_data(cqes);
         ret = cqes->res;
 
+        trace_luring_process_completion(s, luringcb, ret);
+
         if (ret == luringcb->qiov->size) {
             ret = 0;
         } else if (ret >= 0) {
@@ -233,6 +235,7 @@ static int ioq_submit(LuringState *s)
             QSIMPLEQ_REMOVE_HEAD(&s->io_q.sq_overflow, next);
         }
         ret = io_uring_submit(&s->ring);
+        trace_luring_io_uring_submit(s, ret);
         /* Prevent infinite loop if submission is refused */
         if (ret <= 0) {
             if (ret == -EAGAIN) {
@@ -339,6 +342,8 @@ int coroutine_fn luring_co_submit(BlockDriverState *bs, LuringState *s, int fd,
         .is_read    = (type == QEMU_AIO_READ),
     };
 
+    trace_luring_co_submit(bs, s, &luringcb, fd, offset, qiov ? qiov->size : 0, type);
+
     ret = luring_do_submit(fd, &luringcb, s, offset, type);
     if (ret < 0) {
         return ret;
diff --git a/block/trace-events b/block/trace-events
index 069779773b..02952fe4cb 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -67,6 +67,9 @@ luring_io_plug(void *s) "LuringState %p plug"
 luring_io_unplug(void *s, int blocked, int plugged, int queued, int inflight) "LuringState %p blocked %d plugged %d queued %d inflight %d"
 luring_do_submit(void *s, int blocked, int plugged, int queued, int inflight) "LuringState %p blocked %d plugged %d queued %d inflight %d"
 luring_do_submit_done(void *s, int ret) "LuringState %p submitted to kernel %d"
+luring_co_submit(void *bs, void *s, void *luringcb, int fd, uint64_t offset, size_t nbytes, int type) "bs %p s %p luringcb %p fd %d offset %" PRId64 " nbytes %zd type %d"
+luring_process_completion(void *s, void *aiocb, int ret) "LuringState %p luringcb %p ret %d"
+luring_io_uring_submit(void *s, int ret) "LuringState %p ret %d"
 
 # qcow2.c
 qcow2_writev_start_req(void *co, int64_t offset, int bytes) "co %p offset 0x%" PRIx64 " bytes %d"
-- 
2.21.0