[Qemu-devel] [PATCH v6 09/14] block: add trace events for io_uring

From: Aarushi Mehta <mehta.aaru20@gmail.com>
To: qemu-devel@nongnu.org
Cc: Fam Zheng <fam@euphon.net>, Kevin Wolf <kwolf@redhat.com>,
	qemu-block@nongnu.org, Sergio Lopez <slp@redhat.com>,
	Markus Armbruster <armbru@redhat.com>,
	Maxim Levitsky <mlevitsk@redhat.com>,
	saket.sinha89@gmail.com, Max Reitz <mreitz@redhat.com>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Stefan Hajnoczi <stefan@redhat.com>,
	Julia Suvorova <jusual@mail.ru>,
	Aarushi Mehta <mehta.aaru20@gmail.com>
Subject: [Qemu-devel] [PATCH v6 09/14] block: add trace events for io_uring
Date: Fri, 19 Jul 2019 19:05:25 +0530	[thread overview]
Message-ID: <20190719133530.28688-10-mehta.aaru20@gmail.com> (raw)
In-Reply-To: <20190719133530.28688-1-mehta.aaru20@gmail.com>

Signed-off-by: Aarushi Mehta <mehta.aaru20@gmail.com>
---
 block/io_uring.c   | 22 +++++++++++++++++++---
 block/trace-events | 12 ++++++++++++
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/block/io_uring.c b/block/io_uring.c
index e8dbc388a6..e9c1dc1dc7 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
 
@@ -93,6 +94,8 @@ static void luring_resubmit_short_read(LuringState *s, LuringAIOCB *luringcb,
     QEMUIOVector *resubmit_qiov;
     size_t remaining;
 
+    trace_luring_resubmit_short_read(s, luringcb, nread);
+
     /* Update read position */
     luringcb->total_read = nread;
     remaining = luringcb->qiov->size - luringcb->total_read;
@@ -163,6 +166,7 @@ static void luring_process_completions(LuringState *s)
 
         /* Change counters one-by-one because we can be nested. */
         s->io_q.in_flight--;
+        trace_luring_process_completion(s, luringcb, ret);
 
         /* total_read is non-zero only for resubmitted read requests */
         total_bytes = ret + luringcb->total_read;
@@ -263,6 +267,7 @@ 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) {
@@ -287,12 +292,15 @@ static int ioq_submit(LuringState *s)
 
 void luring_io_plug(BlockDriverState *bs, LuringState *s)
 {
+    trace_luring_io_plug(s);
     s->io_q.plugged++;
 }
 
 void luring_io_unplug(BlockDriverState *bs, LuringState *s)
 {
     assert(s->io_q.plugged);
+    trace_luring_io_unplug(s, 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);
@@ -313,6 +321,7 @@ 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 = &luringcb->sqeq;
 
     switch (type) {
@@ -336,11 +345,14 @@ static int luring_do_submit(int fd, LuringAIOCB *luringcb, LuringState *s,
 
     QSIMPLEQ_INSERT_TAIL(&s->io_q.sq_overflow, luringcb, next);
     s->io_q.in_queue++;
-
+    trace_luring_do_submit(s, 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(s, ret);
+        return ret;
     }
     return 0;
 }
@@ -355,8 +367,10 @@ int coroutine_fn luring_co_submit(BlockDriverState *bs, LuringState *s, int fd,
         .qiov       = qiov,
         .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;
     }
@@ -388,6 +402,7 @@ LuringState *luring_init(Error **errp)
     int rc;
     LuringState *s;
     s = g_new0(LuringState, 1);
+    trace_luring_init_state(s, sizeof(*s));
     struct io_uring *ring = &s->ring;
     rc = io_uring_queue_init(MAX_EVENTS, ring, 0);
     if (rc < 0) {
@@ -405,4 +420,5 @@ void luring_cleanup(LuringState *s)
 {
     io_uring_queue_exit(&s->ring);
     g_free(s);
+    trace_luring_cleanup_state(s);
 }
diff --git a/block/trace-events b/block/trace-events
index d724df0117..5060afb2f7 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -60,6 +60,18 @@ qmp_block_stream(void *bs) "bs %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) "%p freed"
+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"
+luring_resubmit_short_read(void *s, void *luringcb, int nread) "LuringState %p luringcb %p nread
+
 # 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"
-- 
2.21.0


