@@ -478,6 +478,13 @@
# should not affect the correctness of postcopy migration.
# (since 7.1)
#
+# @multifd-sync-after-each-section: Synchronize channels after each
+# section is sent. We used to do
+# that in the past, but it is
+# suboptimal.
+# Default value is true until all code is in.
+# (since 8.0)
+#
# Features:
# @unstable: Members @x-colo and @x-ignore-shared are experimental.
#
@@ -492,7 +499,8 @@
'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate',
{ 'name': 'x-ignore-shared', 'features': [ 'unstable' ] },
'validate-uuid', 'background-snapshot',
- 'zero-copy-send', 'postcopy-preempt'] }
+ 'zero-copy-send', 'postcopy-preempt',
+ 'multifd-sync-after-each-section'] }
##
# @MigrationCapabilityStatus:
@@ -424,6 +424,7 @@ int migrate_multifd_channels(void);
MultiFDCompression migrate_multifd_compression(void);
int migrate_multifd_zlib_level(void);
int migrate_multifd_zstd_level(void);
+bool migrate_multifd_sync_after_each_section(void);
#ifdef CONFIG_LINUX
bool migrate_use_zero_copy_send(void);
@@ -54,6 +54,7 @@ const size_t hw_compat_7_1_len = G_N_ELEMENTS(hw_compat_7_1);
GlobalProperty hw_compat_7_0[] = {
{ "arm-gicv3-common", "force-8-bit-prio", "on" },
{ "nvme-ns", "eui64-default", "on"},
+ { "migration", "multifd-sync-after-each-section", "on"},
};
const size_t hw_compat_7_0_len = G_N_ELEMENTS(hw_compat_7_0);
@@ -167,7 +167,8 @@ INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snapshot,
MIGRATION_CAPABILITY_XBZRLE,
MIGRATION_CAPABILITY_X_COLO,
MIGRATION_CAPABILITY_VALIDATE_UUID,
- MIGRATION_CAPABILITY_ZERO_COPY_SEND);
+ MIGRATION_CAPABILITY_ZERO_COPY_SEND,
+ MIGRATION_CAPABILITY_MULTIFD_SYNC_AFTER_EACH_SECTION);
/* When we add fault tolerance, we could have several
migrations at once. For now we don't need to add
@@ -2701,6 +2702,15 @@ bool migrate_use_multifd(void)
return s->enabled_capabilities[MIGRATION_CAPABILITY_MULTIFD];
}
+bool migrate_multifd_sync_after_each_section(void)
+{
+ MigrationState *s = migrate_get_current();
+
+ return true;
+ // We will change this when code gets in.
+ return s->enabled_capabilities[MIGRATION_CAPABILITY_MULTIFD_SYNC_AFTER_EACH_SECTION];
+}
+
bool migrate_pause_before_switchover(void)
{
MigrationState *s;
@@ -4535,7 +4545,8 @@ static Property migration_properties[] = {
DEFINE_PROP_MIG_CAP("x-zero-copy-send",
MIGRATION_CAPABILITY_ZERO_COPY_SEND),
#endif
-
+ DEFINE_PROP_MIG_CAP("multifd-sync-after-each-section",
+ MIGRATION_CAPABILITY_MULTIFD_SYNC_AFTER_EACH_SECTION),
DEFINE_PROP_END_OF_LIST(),
};