[Qemu-devel] [PATCH v4 9/9] block: add trace events for io_uring

[Aarushi Mehta <mehta.aaru20@gmail.com>]

Signed-off-by: Aarushi Mehta <mehta.aaru20@gmail.com>
---
 block/io_uring.c   | 14 ++++++++++++--
 block/trace-events |  8 ++++++++
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/block/io_uring.c b/block/io_uring.c
index 536a9fbe87..e92e45ccca 100644
--- a/block/io_uring.c
+++ b/block/io_uring.c
@@ -17,6 +17,7 @@
 #include "block/raw-aio.h"
 #include "qemu/coroutine.h"
 #include "qapi/error.h"
+#include "trace.h"
 
 #define MAX_EVENTS 128
 
@@ -192,12 +193,15 @@ static int ioq_submit(LuringState *s)
 
 void luring_io_plug(BlockDriverState *bs, LuringState *s)
 {
+    trace_luring_io_plug();
     s->io_q.plugged++;
 }
 
 void luring_io_unplug(BlockDriverState *bs, LuringState *s)
 {
     assert(s->io_q.plugged);
+    trace_luring_io_unplug(s->io_q.blocked, s->io_q.plugged,
+                                 s->io_q.in_queue, s->io_q.in_flight);
     if (--s->io_q.plugged == 0 &&
         !s->io_q.blocked && s->io_q.in_queue > 0) {
         ioq_submit(s);
@@ -218,6 +222,7 @@ void luring_io_unplug(BlockDriverState *bs, LuringState *s)
 static int luring_do_submit(int fd, LuringAIOCB *luringcb, LuringState *s,
                             uint64_t offset, int type)
 {
+    int ret;
     struct io_uring_sqe *sqes = io_uring_get_sqe(&s->ring);
     if (!sqes) {
         sqes = &luringcb->sqeq;
@@ -243,11 +248,14 @@ static int luring_do_submit(int fd, LuringAIOCB *luringcb, LuringState *s,
     }
     io_uring_sqe_set_data(sqes, luringcb);
     s->io_q.in_queue++;
-
+    trace_luring_do_submit(s->io_q.blocked, s->io_q.plugged,
+                           s->io_q.in_queue, s->io_q.in_flight);
     if (!s->io_q.blocked &&
         (!s->io_q.plugged ||
          s->io_q.in_flight + s->io_q.in_queue >= MAX_EVENTS)) {
-        return ioq_submit(s);
+        ret = ioq_submit(s);
+        trace_luring_do_submit_done(ret);
+        return ret;
     }
     return 0;
 }
@@ -295,6 +303,7 @@ LuringState *luring_init(Error **errp)
     int rc;
     LuringState *s;
     s = g_malloc0(sizeof(*s));
+    trace_luring_init_state((void *)s, sizeof(*s));
     struct io_uring *ring = &s->ring;
     rc =  io_uring_queue_init(MAX_EVENTS, ring, 0);
     if (rc < 0) {
@@ -312,4 +321,5 @@ void luring_cleanup(LuringState *s)
 {
     io_uring_queue_exit(&s->ring);
     g_free(s);
+    trace_luring_cleanup_state();
 }
diff --git a/block/trace-events b/block/trace-events
index 1e0653ce6d..038ff14815 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -60,6 +60,14 @@ qmp_block_stream(void *bs, void *job) "bs %p job %p"
 file_paio_submit(void *acb, void *opaque, int64_t offset, int count, int type) "acb %p opaque %p offset %"PRId64" count %d type %d"
 file_copy_file_range(void *bs, int src, int64_t src_off, int dst, int64_t dst_off, int64_t bytes, int flags, int64_t ret) "bs %p src_fd %d offset %"PRIu64" dst_fd %d offset %"PRIu64" bytes %"PRIu64" flags %d ret %"PRId64
 
+#io_uring.c
+luring_init_state(void *s, size_t size) "s %p size %zu"
+luring_cleanup_state(void) "s freed"
+disable luring_io_plug(void) "plug"
+disable luring_io_unplug(int blocked, int plugged, int queued, int inflight) "blocked %d plugged %d queued %d inflight %d"
+disable luring_do_submit(int blocked, int plugged, int queued, int inflight) "blocked %d plugged %d queued %d inflight %d"
+disable luring_do_submit_done(int ret) "submitted to kernel %d"
+
 # qcow2.c
 qcow2_writev_start_req(void *co, int64_t offset, int bytes) "co %p offset 0x%" PRIx64 " bytes %d"
 qcow2_writev_done_req(void *co, int ret) "co %p ret %d"
-- 
2.17.1