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[Qemu-devel] [PATCH 06/11] migration: introduce vm_down_start_time
From: |
Peter Xu |
Subject: |
[Qemu-devel] [PATCH 06/11] migration: introduce vm_down_start_time |
Date: |
Wed, 3 Jan 2018 13:40:38 +0800 |
Introduce MigrationState.vm_down_start_time to replace the local
variable "start_time" in migration_thread to avoid passing things around.
Signed-off-by: Peter Xu <address@hidden>
---
migration/migration.c | 12 ++++--------
migration/migration.h | 2 ++
2 files changed, 6 insertions(+), 8 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index 62b3766852..2d8b47197e 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2055,16 +2055,14 @@ static int migration_maybe_pause(MigrationState *s,
*
* @s: Current migration state
* @current_active_state: The migration state we expect to be in
- * @*start_time: Pointer to time to update
*/
-static void migration_completion(MigrationState *s, int current_active_state,
- int64_t *start_time)
+static void migration_completion(MigrationState *s, int current_active_state)
{
int ret;
if (s->state == MIGRATION_STATUS_ACTIVE) {
qemu_mutex_lock_iothread();
- *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ s->vm_down_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
s->old_vm_running = runstate_is_running();
ret = global_state_store();
@@ -2170,7 +2168,6 @@ static void *migration_thread(void *opaque)
* measured bandwidth
*/
int64_t threshold_size = 0;
- int64_t start_time = initial_time;
int64_t end_time;
bool entered_postcopy = false;
/* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */
@@ -2241,8 +2238,7 @@ static void *migration_thread(void *opaque)
qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy);
} else {
trace_migration_thread_low_pending(pending_size);
- migration_completion(s, current_active_state,
- &start_time);
+ migration_completion(s, current_active_state);
break;
}
}
@@ -2293,7 +2289,7 @@ static void *migration_thread(void *opaque)
uint64_t transferred_bytes = qemu_ftell(s->to_dst_file);
s->mig_total_time = end_time - s->mig_start_time;
if (!entered_postcopy) {
- s->downtime = end_time - start_time;
+ s->downtime = end_time - s->vm_down_start_time;
}
if (s->mig_total_time) {
s->mbps = (((double) transferred_bytes * 8.0) /
diff --git a/migration/migration.h b/migration/migration.h
index 0f5df2367c..3ab5506233 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -107,6 +107,8 @@ struct MigrationState
int64_t mig_start_time;
/* Total time used by latest migration (ms) */
int64_t mig_total_time;
+ /* Timestamp when VM is down (ms) to migrate the last stuff */
+ int64_t vm_down_start_time;
int64_t downtime;
int64_t expected_downtime;
bool enabled_capabilities[MIGRATION_CAPABILITY__MAX];
--
2.14.3
- [Qemu-devel] [PATCH 05/11] migration: move vm_old_running into global state, (continued)
[Qemu-devel] [PATCH 04/11] migration: split use of MigrationState.total_time, Peter Xu, 2018/01/03
[Qemu-devel] [PATCH 06/11] migration: introduce vm_down_start_time,
Peter Xu <=
[Qemu-devel] [PATCH 08/11] migration: use switch at the end of migration, Peter Xu, 2018/01/03
[Qemu-devel] [PATCH 07/11] migration: introduce migrate_calculate_complete, Peter Xu, 2018/01/03
[Qemu-devel] [PATCH 09/11] migration: cleanup stats update into function, Peter Xu, 2018/01/03