[Qemu-devel] [PATCH 04/11] migration: split use of MigrationState.total_time

[Peter Xu <peterx@redhat.com>]

It was used either to:

1. store initial timestamp of migration start, and
2. store total time used by last migration

Let's provide two parameters for each of them.  Mix use of the two is
slightly misleading.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/migration.c | 13 +++++++------
 migration/migration.h |  5 ++++-
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index 20f7565527..b684c2005d 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -613,7 +613,7 @@ MigrationInfo *qmp_query_migrate(Error **errp)
         info->has_status = true;
         info->has_total_time = true;
         info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
-            - s->total_time;
+            - s->mig_start_time;
         info->has_expected_downtime = true;
         info->expected_downtime = s->expected_downtime;
         info->has_setup_time = true;
@@ -629,7 +629,7 @@ MigrationInfo *qmp_query_migrate(Error **errp)
     case MIGRATION_STATUS_COMPLETED:
         info->has_status = true;
         info->has_total_time = true;
-        info->total_time = s->total_time;
+        info->total_time = s->mig_total_time;
         info->has_downtime = true;
         info->downtime = s->downtime;
         info->has_setup_time = true;
@@ -1270,7 +1270,8 @@ MigrationState *migrate_init(void)
 
     migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
 
-    s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+    s->mig_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+    s->mig_total_time = 0;
     return s;
 }
 
@@ -2293,13 +2294,13 @@ static void *migration_thread(void *opaque)
     qemu_mutex_lock_iothread();
     if (s->state == MIGRATION_STATUS_COMPLETED) {
         uint64_t transferred_bytes = qemu_ftell(s->to_dst_file);
-        s->total_time = end_time - s->total_time;
+        s->mig_total_time = end_time - s->mig_start_time;
         if (!entered_postcopy) {
             s->downtime = end_time - start_time;
         }
-        if (s->total_time) {
+        if (s->mig_total_time) {
             s->mbps = (((double) transferred_bytes * 8.0) /
-                       ((double) s->total_time)) / 1000;
+                       ((double) s->mig_total_time)) / 1000;
         }
         runstate_set(RUN_STATE_POSTMIGRATE);
     } else {
diff --git a/migration/migration.h b/migration/migration.h
index 663415fe48..ac74a12713 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -103,7 +103,10 @@ struct MigrationState
     } rp_state;
 
     double mbps;
-    int64_t total_time;
+    /* Timestamp when recent migration starts (ms) */
+    int64_t mig_start_time;
+    /* Total time used by latest migration (ms) */
+    int64_t mig_total_time;
     int64_t downtime;
     int64_t expected_downtime;
     bool enabled_capabilities[MIGRATION_CAPABILITY__MAX];
-- 
2.14.3