[Qemu-devel] [PATCH v5 03/12] rdma: export throughput w/ MigrationStats QMP

[mrhines]

From: "Michael R. Hines" <address@hidden>

This exposes throughput (in megabits/sec) through QMP.

By itself, this patch only prints zero and the value is
actually calculated in the next patch.

Signed-off-by: Michael R. Hines <address@hidden>
---
 hmp.c                         |    2 ++
 include/migration/qemu-file.h |    2 ++
 migration.c                   |    2 ++
 qapi-schema.json              |    5 ++++-
 savevm.c                      |    7 +++++++
 5 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/hmp.c b/hmp.c
index 4fb76ec..ab2c030 100644
--- a/hmp.c
+++ b/hmp.c
@@ -167,6 +167,8 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
     if (info->has_ram) {
         monitor_printf(mon, "transferred ram: %" PRIu64 " kbytes\n",
                        info->ram->transferred >> 10);
+        monitor_printf(mon, "throughput: %0.2f mbps\n",
+                       info->ram->mbps);
         monitor_printf(mon, "remaining ram: %" PRIu64 " kbytes\n",
                        info->ram->remaining >> 10);
         monitor_printf(mon, "total ram: %" PRIu64 " kbytes\n",
diff --git a/include/migration/qemu-file.h b/include/migration/qemu-file.h
index 7519464..70eb9bd 100644
--- a/include/migration/qemu-file.h
+++ b/include/migration/qemu-file.h
@@ -80,6 +80,8 @@ void qemu_put_byte(QEMUFile *f, int v);
  * The buffer should be available till it is sent asynchronously.
  */
 void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, int size);
+double qemu_get_mbps(void);
+
 
 static inline void qemu_put_ubyte(QEMUFile *f, unsigned int v)
 {
diff --git a/migration.c b/migration.c
index 3eb0fad..e2d73c4 100644
--- a/migration.c
+++ b/migration.c
@@ -201,6 +201,7 @@ MigrationInfo *qmp_query_migrate(Error **errp)
         info->ram->normal = norm_mig_pages_transferred();
         info->ram->normal_bytes = norm_mig_bytes_transferred();
         info->ram->dirty_pages_rate = s->dirty_pages_rate;
+        info->ram->mbps = qemu_get_mbps();
 
         if (blk_mig_active()) {
             info->has_disk = true;
@@ -230,6 +231,7 @@ MigrationInfo *qmp_query_migrate(Error **errp)
         info->ram->skipped = skipped_mig_pages_transferred();
         info->ram->normal = norm_mig_pages_transferred();
         info->ram->normal_bytes = norm_mig_bytes_transferred();
+        info->ram->mbps = qemu_get_mbps();
         break;
     case MIG_STATE_ERROR:
         info->has_status = true;
diff --git a/qapi-schema.json b/qapi-schema.json
index 751d3c2..cc846c3 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -507,12 +507,15 @@
 # @dirty-pages-rate: number of pages dirtied by second by the
 #        guest (since 1.3)
 #
+# @mbps: throughput in megabits/sec. (since 1.5)
+#
 # Since: 0.14.0
 ##
 { 'type': 'MigrationStats',
   'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int' ,
            'duplicate': 'int', 'skipped': 'int', 'normal': 'int',
-           'normal-bytes': 'int', 'dirty-pages-rate' : 'int' } }
+           'normal-bytes': 'int', 'dirty-pages-rate' : 'int',
+           'mbps' : 'number' } }
 
 ##
 # @XBZRLECacheStats
diff --git a/savevm.c b/savevm.c
index 4dbfa16..6fcad19 100644
--- a/savevm.c
+++ b/savevm.c
@@ -632,6 +632,13 @@ static void qemu_fill_buffer(QEMUFile *f)
         qemu_file_set_error(f, len);
 }
 
+static double mbps = 0;
+
+double qemu_get_mbps(void)
+{
+    return mbps;
+}
+
 int qemu_get_fd(QEMUFile *f)
 {
     if (f->ops->get_fd) {
-- 
1.7.10.4