[Qemu-devel] [PATCH 3/7] migration: print total downtime for final phase of migration

[Juan Quintela <quintela@redhat.com>]

Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 hmp.c            | 4 ++++
 migration.c      | 5 ++++-
 migration.h      | 1 +
 qapi-schema.json | 6 +++++-
 4 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/hmp.c b/hmp.c
index c0b0a10..10fee1b 100644
--- a/hmp.c
+++ b/hmp.c
@@ -151,6 +151,10 @@ void hmp_info_migrate(Monitor *mon)
         monitor_printf(mon, "Migration status: %s\n", info->status);
         monitor_printf(mon, "total time: %" PRIu64 " milliseconds\n",
                        info->total_time);
+        if (strcmp(info->status, "completed") == 0) {
+            monitor_printf(mon, "downtime: %" PRIu64 " milliseconds\n",
+                           info->downtime);
+        }
     }

     if (info->has_ram) {
diff --git a/migration.c b/migration.c
index 159728d..4c2ac6c 100644
--- a/migration.c
+++ b/migration.c
@@ -194,6 +194,7 @@ MigrationInfo *qmp_query_migrate(Error **errp)
         info->has_status = true;
         info->status = g_strdup("completed");
         info->total_time = s->total_time;
+        info->downtime = s->downtime;

         info->has_ram = true;
         info->ram = g_malloc0(sizeof(*info->ram));
@@ -326,9 +327,10 @@ static void migrate_fd_put_ready(void *opaque)
         migrate_fd_error(s);
     } else if (ret == 1) {
         int old_vm_running = runstate_is_running();
-        int64_t end_time;
+        int64_t start_time, end_time;

         DPRINTF("done iterating\n");
+        start_time = qemu_get_clock_ms(rt_clock);
         qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
         vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);

@@ -339,6 +341,7 @@ static void migrate_fd_put_ready(void *opaque)
         }
         end_time = qemu_get_clock_ms(rt_clock);
         s->total_time = end_time - s->total_time;
+        s->downtime = end_time - start_time;
         if (s->state != MIG_STATE_COMPLETED) {
             if (old_vm_running) {
                 vm_start();
diff --git a/migration.h b/migration.h
index a9852fc..3462917 100644
--- a/migration.h
+++ b/migration.h
@@ -40,6 +40,7 @@ struct MigrationState
     void *opaque;
     MigrationParams params;
     int64_t total_time;
+    int64_t downtime;
     bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
     int64_t xbzrle_cache_size;
 };
diff --git a/qapi-schema.json b/qapi-schema.json
index 907051a..6df1ce3 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -319,13 +319,17 @@
 #        If migration has ended, it returns the total migration
 #        time. (since 1.2)
 #
+# @downtime: total downtime in milliseconds for the guest.
+#        (since 1.2)
+#
 # Since: 0.14.0
 ##
 { 'type': 'MigrationInfo',
   'data': {'*status': 'str', '*ram': 'MigrationStats',
            '*disk': 'MigrationStats',
            '*xbzrle-cache': 'XBZRLECacheStats',
-           'total-time': 'int'} }
+           'total-time': 'int',
+           'downtime': 'int'} }

 ##
 # @query-migrate
-- 
1.7.11.2