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[Qemu-devel] [PATCH v2 08/13] migration: use switch at the end of migrat
From: |
Peter Xu |
Subject: |
[Qemu-devel] [PATCH v2 08/13] migration: use switch at the end of migration |
Date: |
Wed, 3 Jan 2018 20:20:12 +0800 |
It converts the old if clauses into switch, explicitly mentions the
possible migration states. The old nested "if"s are not clear on what
we do on different states.
Signed-off-by: Peter Xu <address@hidden>
---
migration/migration.c | 44 +++++++++++++++++++++++++++-----------------
1 file changed, 27 insertions(+), 17 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index 72f0b586f7..4dd21f8636 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2302,26 +2302,30 @@ static void *migration_thread(void *opaque)
cpu_throttle_stop();
qemu_mutex_lock_iothread();
- if (s->state == MIGRATION_STATUS_COMPLETED) {
+ switch (s->state) {
+ case MIGRATION_STATUS_COMPLETED:
migration_calculate_complete(s);
runstate_set(RUN_STATE_POSTMIGRATE);
- } else {
- if (s->state == MIGRATION_STATUS_ACTIVE) {
- /*
- * We should really assert here, but since it's during
- * migration, let's try to reduce the usage of assertions.
- */
- if (!migrate_colo_enabled()) {
- error_report("%s: critical error: calling COLO code without "
- "COLO enabled", __func__);
- }
- migrate_start_colo_process(s);
- /*
- * Fixme: we will run VM in COLO no matter its old running state.
- * After exited COLO, we will keep running.
- */
- s->vm_was_running = true;
+ break;
+
+ case MIGRATION_STATUS_ACTIVE:
+ /*
+ * We should really assert here, but since it's during
+ * migration, let's try to reduce the usage of assertions.
+ */
+ if (!migrate_colo_enabled()) {
+ error_report("%s: critical error: calling COLO code without "
+ "COLO enabled", __func__);
}
+ migrate_start_colo_process(s);
+ /*
+ * Fixme: we will run VM in COLO no matter its old running state.
+ * After exited COLO, we will keep running.
+ */
+ s->vm_was_running = true;
+ /* Fallthrough */
+ case MIGRATION_STATUS_FAILED:
+ case MIGRATION_STATUS_CANCELLED:
if (s->vm_was_running) {
vm_start();
} else {
@@ -2329,6 +2333,12 @@ static void *migration_thread(void *opaque)
runstate_set(RUN_STATE_POSTMIGRATE);
}
}
+ break;
+
+ default:
+ /* Should not reach here, but if so, forgive the VM. */
+ error_report("%s: Unknown ending state %d", __func__, s->state);
+ break;
}
qemu_bh_schedule(s->cleanup_bh);
qemu_mutex_unlock_iothread();
--
2.14.3
- Re: [Qemu-devel] [PATCH v2 01/13] migration: assert colo instead of check, (continued)
- [Qemu-devel] [PATCH v2 02/13] migration: qemu_savevm_state_cleanup() in cleanup, Peter Xu, 2018/01/03
- [Qemu-devel] [PATCH v2 03/13] migration: remove "enable_colo" var, Peter Xu, 2018/01/03
- [Qemu-devel] [PATCH v2 04/13] migration: split use of MigrationState.total_time, Peter Xu, 2018/01/03
- [Qemu-devel] [PATCH v2 05/13] migration: move vm_old_running into global state, Peter Xu, 2018/01/03
- [Qemu-devel] [PATCH v2 06/13] migration: introduce downtime_start, Peter Xu, 2018/01/03
- [Qemu-devel] [PATCH v2 07/13] migration: introduce migrate_calculate_complete, Peter Xu, 2018/01/03
- [Qemu-devel] [PATCH v2 08/13] migration: use switch at the end of migration,
Peter Xu <=
- [Qemu-devel] [PATCH v2 09/13] migration: cleanup stats update into function, Peter Xu, 2018/01/03
- [Qemu-devel] [PATCH v2 10/13] migration: major cleanup for migrate iterations, Peter Xu, 2018/01/03
- [Qemu-devel] [PATCH v2 11/13] migration: put the finish part into a new function, Peter Xu, 2018/01/03
- [Qemu-devel] [PATCH v2 12/13] migration: remove some block_cleanup_parameters(), Peter Xu, 2018/01/03
- [Qemu-devel] [PATCH v2 13/13] migration: remove notify in fd_error, Peter Xu, 2018/01/03