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> --- include/migration/migration.h | 1 + migration/migration.c | 9 +++++++++ qapi-schema.json | 5 ++++- 3 files changed, 14 insertions(+), 1 deletion(-) diff --git a/include/migration/migration.h b/include/migration/migration.h index 49ec501..2951253 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -270,6 +270,7 @@ 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_message(MigrationIncomingState *mis, diff --git a/migration/migration.c b/migration/migration.c index d735976..e10284e 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1341,6 +1341,15 @@ 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/qapi-schema.json b/qapi-schema.json index 80603cf..78617fe 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -894,11 +894,14 @@ # @release-ram: if enabled, qemu will free the migrated ram pages on the source # during postcopy-ram migration. (since 2.9) # +# @postcopy-blocktime: Calculate downtime for postcopy live migration (since 2.10) +# # Since: 1.2 ## { 'enum': 'MigrationCapability', 'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks', - 'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram'] } + 'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram', + 'postcopy-blocktime'] } ## # @MigrationCapabilityStatus: -- 1.8.3.1