* Alexey Perevalov (a.pereva...@samsung.com) wrote:
> 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.
>
> Signed-off-by: Alexey Perevalov <a.pereva...@samsung.com>
Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.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 ba1a16c..82bbcd8 100644
> --- a/include/migration/migration.h
> +++ b/include/migration/migration.h
> @@ -315,6 +315,7 @@ 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 569a7f6..c0443ce 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -1371,6 +1371,15 @@ 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 01b087f..fde6d63 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:
> --
> 1.9.1
>
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
