From: "Dr. David Alan Gilbert" <dgilb...@redhat.com>
Switch to postcopy if:
1) There's still a significant amount to transfer
2) Postcopy is enabled
3) migrate_postcopy_start has been issued.
and change the cleanup at the end of migration to match.
Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
---
migration.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++-------------
1 file changed, 70 insertions(+), 18 deletions(-)
diff --git a/migration.c b/migration.c
index 4be9053..472fc4d 100644
--- a/migration.c
+++ b/migration.c
@@ -982,16 +982,36 @@ static int postcopy_start(MigrationState *ms)
static void *migration_thread(void *opaque)
{
MigrationState *s = opaque;
+ /* Used by the bandwidth calcs, updated later */
int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
int64_t initial_bytes = 0;
int64_t max_size = 0;
int64_t start_time = initial_time;
+
bool old_vm_running = false;
+ /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */
+ enum MigrationPhase current_active_type = MIG_STATE_ACTIVE;
+
qemu_savevm_state_begin(s->file, &s->params);
+ if (migrate_postcopy_ram()) {
+ /* Now tell the dest that it should open it's end so it can reply */
+ qemu_savevm_send_openrp(s->file);
+
+ /* And ask it to send an ack that will make stuff easier to debug */
+ qemu_savevm_send_reqack(s->file, 1);
+
+ /* Tell the destination that we *might* want to do postcopy later;
+ * if the other end can't do postcopy it should fail now, nice and
+ * early.
+ */
+ qemu_savevm_send_postcopy_ram_advise(s->file);
+ }
+
s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
+ current_active_type = MIG_STATE_ACTIVE;
migrate_set_state(s, MIG_STATE_SETUP, MIG_STATE_ACTIVE);
DPRINTF("setup complete\n");
@@ -1012,37 +1032,68 @@ static void *migration_thread(void *opaque)
" nonpost=%" PRIu64 ")\n",
pending_size, max_size, pend_post, pend_nonpost);
if (pending_size && pending_size >= max_size) {
- qemu_savevm_state_iterate(s->file);
- } else {
- int ret;
+ /* Still a significant amount to transfer */
+
+ current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ if (migrate_postcopy_ram() &&
+ s->state != MIG_STATE_POSTCOPY_ACTIVE &&
+ pend_nonpost == 0 && s->start_postcopy) {
- DPRINTF("done iterating\n");
- qemu_mutex_lock_iothread();
- start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
- qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
- old_vm_running = runstate_is_running();
+ if (!postcopy_start(s)) {
+ current_active_type = MIG_STATE_POSTCOPY_ACTIVE;
+ }
- ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
- if (ret >= 0) {
- qemu_file_set_rate_limit(s->file, INT64_MAX);
- qemu_savevm_state_complete(s->file);
+ continue;
+ } else {
+ /* Just another iteration step */
+ qemu_savevm_state_iterate(s->file);
}
- qemu_mutex_unlock_iothread();
+ } else {
+ int ret;
- if (ret < 0) {
- migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_ERROR);
- break;
+ DPRINTF("done iterating pending size %" PRIu64 "\n",
+ pending_size);
+
+ if (s->state == MIG_STATE_ACTIVE) {
+ qemu_mutex_lock_iothread();
+ start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
+ old_vm_running = runstate_is_running();
+
+ ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
+ if (ret >= 0) {
+ qemu_file_set_rate_limit(s->file, INT64_MAX);
+ qemu_savevm_state_complete(s->file);
+ }
+ qemu_mutex_unlock_iothread();
+
+ if (ret < 0) {
+ migrate_set_state(s, current_active_type,
+ MIG_STATE_ERROR);
+ break;
+ }
+ } else {
+ assert(s->state == MIG_STATE_POSTCOPY_ACTIVE);
+ DPRINTF("postcopy end\n");
+
+ qemu_savevm_state_postcopy_complete(s->file);
+ DPRINTF("postcopy end after complete\n");
+
+ await_outgoing_return_path_close(s);
+ DPRINTF("postcopy end after rp close");
}
if (!qemu_file_get_error(s->file)) {
- migrate_set_state(s, MIG_STATE_ACTIVE,
MIG_STATE_COMPLETED);
+ migrate_set_state(s, current_active_type,
+ MIG_STATE_COMPLETED);
break;
}
}
}
if (qemu_file_get_error(s->file)) {
- migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_ERROR);
+ migrate_set_state(s, current_active_type, MIG_STATE_ERROR);
+ DPRINTF("migration_thread: file is in error state\n");
break;
}
current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
@@ -1073,6 +1124,7 @@ static void *migration_thread(void *opaque)
}
}
+ DPRINTF("migration_thread: Hit error: case\n");
qemu_mutex_lock_iothread();
if (s->state == MIG_STATE_COMPLETED) {
int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
--
1.9.3
