[Qemu-devel] [PULL 31/57] MIGRATION_STATUS_POSTCOPY_ACTIVE: Add new migration state

[Juan Quintela <quintela@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

'MIGRATION_STATUS_POSTCOPY_ACTIVE' is entered after migrate_start_postcopy

'migration_in_postcopy' is provided for other sections to know if
they're in postcopy.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 include/migration/migration.h |  2 ++
 migration/migration.c         | 47 +++++++++++++++++++++++++++++++++++++++++--
 qapi-schema.json              |  4 +++-
 trace-events                  |  1 +
 4 files changed, 51 insertions(+), 3 deletions(-)

diff --git a/include/migration/migration.h b/include/migration/migration.h
index 2176666..219032d 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -170,6 +170,8 @@ MigrationState *migrate_init(const MigrationParams *params);
 bool migration_in_setup(MigrationState *);
 bool migration_has_finished(MigrationState *);
 bool migration_has_failed(MigrationState *);
+/* True if outgoing migration has entered postcopy phase */
+bool migration_in_postcopy(MigrationState *);
 MigrationState *migrate_get_current(void);

 void migrate_compress_threads_create(void);
diff --git a/migration/migration.c b/migration/migration.c
index 85e68bc..2acd0e6 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -462,6 +462,7 @@ static bool migration_is_setup_or_active(int state)
 {
     switch (state) {
     case MIGRATION_STATUS_ACTIVE:
+    case MIGRATION_STATUS_POSTCOPY_ACTIVE:
     case MIGRATION_STATUS_SETUP:
         return true;

@@ -537,6 +538,39 @@ MigrationInfo *qmp_query_migrate(Error **errp)

         get_xbzrle_cache_stats(info);
         break;
+    case MIGRATION_STATUS_POSTCOPY_ACTIVE:
+        /* Mostly the same as active; TODO add some postcopy stats */
+        info->has_status = true;
+        info->has_total_time = true;
+        info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
+            - s->total_time;
+        info->has_expected_downtime = true;
+        info->expected_downtime = s->expected_downtime;
+        info->has_setup_time = true;
+        info->setup_time = s->setup_time;
+
+        info->has_ram = true;
+        info->ram = g_malloc0(sizeof(*info->ram));
+        info->ram->transferred = ram_bytes_transferred();
+        info->ram->remaining = ram_bytes_remaining();
+        info->ram->total = ram_bytes_total();
+        info->ram->duplicate = dup_mig_pages_transferred();
+        info->ram->skipped = skipped_mig_pages_transferred();
+        info->ram->normal = norm_mig_pages_transferred();
+        info->ram->normal_bytes = norm_mig_bytes_transferred();
+        info->ram->dirty_pages_rate = s->dirty_pages_rate;
+        info->ram->mbps = s->mbps;
+
+        if (blk_mig_active()) {
+            info->has_disk = true;
+            info->disk = g_malloc0(sizeof(*info->disk));
+            info->disk->transferred = blk_mig_bytes_transferred();
+            info->disk->remaining = blk_mig_bytes_remaining();
+            info->disk->total = blk_mig_bytes_total();
+        }
+
+        get_xbzrle_cache_stats(info);
+        break;
     case MIGRATION_STATUS_COMPLETED:
         get_xbzrle_cache_stats(info);

@@ -718,7 +752,8 @@ static void migrate_fd_cleanup(void *opaque)
         s->file = NULL;
     }

-    assert(s->state != MIGRATION_STATUS_ACTIVE);
+    assert((s->state != MIGRATION_STATUS_ACTIVE) &&
+           (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE));

     if (s->state == MIGRATION_STATUS_CANCELLING) {
         migrate_set_state(s, MIGRATION_STATUS_CANCELLING,
@@ -793,6 +828,11 @@ bool migration_has_failed(MigrationState *s)
             s->state == MIGRATION_STATUS_FAILED);
 }

+bool migration_in_postcopy(MigrationState *s)
+{
+    return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
+}
+
 MigrationState *migrate_init(const MigrationParams *params)
 {
     MigrationState *s = migrate_get_current();
@@ -1307,7 +1347,10 @@ static void *migration_thread(void *opaque)
     s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
     migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_ACTIVE);

-    while (s->state == MIGRATION_STATUS_ACTIVE) {
+    trace_migration_thread_setup_complete();
+
+    while (s->state == MIGRATION_STATUS_ACTIVE ||
+           s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
         int64_t current_time;
         uint64_t pending_size;

diff --git a/qapi-schema.json b/qapi-schema.json
index d25df93..8c3a42a 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -430,6 +430,8 @@
 #
 # @active: in the process of doing migration.
 #
+# @postcopy-active: like active, but now in postcopy mode. (since 2.5)
+#
 # @completed: migration is finished.
 #
 # @failed: some error occurred during migration process.
@@ -439,7 +441,7 @@
 ##
 { 'enum': 'MigrationStatus',
   'data': [ 'none', 'setup', 'cancelling', 'cancelled',
-            'active', 'completed', 'failed' ] }
+            'active', 'postcopy-active', 'completed', 'failed' ] }

 ##
 # @MigrationInfo
diff --git a/trace-events b/trace-events
index d319cf8..a51ce22 100644
--- a/trace-events
+++ b/trace-events
@@ -1452,6 +1452,7 @@ migrate_fd_error(void) ""
 migrate_fd_cancel(void) ""
 migrate_pending(uint64_t size, uint64_t max, uint64_t post, uint64_t nonpost) "pending size %" PRIu64 " max %" PRIu64 " (post=%" PRIu64 " nonpost=%" PRIu64 ")"
 migrate_send_rp_message(int msg_type, uint16_t len) "%d: len %d"
+migration_thread_setup_complete(void) ""
 open_return_path_on_source(void) ""
 open_return_path_on_source_continue(void) ""
 source_return_path_thread_bad_end(void) ""
-- 
2.5.0