From: Alexey Perevalov <a.pereva...@samsung.com>
Right now it could be used on destination side to
enable vCPU blocktime calculation for postcopy live migration.
vCPU blocktime - it's time since vCPU thread was put into
interruptible sleep, till memory page was copied and thread awake.
Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
Signed-off-by: Alexey Perevalov <a.pereva...@samsung.com>
Reviewed-by: Juan Quintela <quint...@redhat.com>
Signed-off-by: Juan Quintela <quint...@redhat.com>
Message-Id: <1521742647-25550-2-git-send-email-a.pereva...@samsung.com>
Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
---
migration/migration.c | 9 +++++++++
migration/migration.h | 1 +
qapi/migration.json | 6 +++++-
3 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/migration/migration.c b/migration/migration.c
index 52a5092add..bf2e8db9c7 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1541,6 +1541,15 @@ bool migrate_zero_blocks(void)
return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
}
+bool migrate_postcopy_blocktime(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME];
+}
+
bool migrate_use_compression(void)
{
MigrationState *s;
diff --git a/migration/migration.h b/migration/migration.h
index 8d2f320c48..46a50bc789 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -230,6 +230,7 @@ int migrate_compress_level(void);
int migrate_compress_threads(void);
int migrate_decompress_threads(void);
bool migrate_use_events(void);
+bool migrate_postcopy_blocktime(void);
/* Sending on the return path - generic and then for each message type */
void migrate_send_rp_shut(MigrationIncomingState *mis,
diff --git a/qapi/migration.json b/qapi/migration.json
index 9d0bf82cf4..24bfc190ba 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -354,16 +354,20 @@
#
# @x-multifd: Use more than one fd for migration (since 2.11)
#
+#
# @dirty-bitmaps: If enabled, QEMU will migrate named dirty bitmaps.
# (since 2.12)
#
+# @postcopy-blocktime: Calculate downtime for postcopy live migration
+# (since 2.13)
+#
# Since: 1.2
##
{ 'enum': 'MigrationCapability',
'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
'block', 'return-path', 'pause-before-switchover', 'x-multifd',
- 'dirty-bitmaps' ] }
+ 'dirty-bitmaps', 'postcopy-blocktime' ] }
##
# @MigrationCapabilityStatus:
--
2.17.0
