Re: [PATCH v2 04/11] qapi/migration: Introduce x-vcpu-dirty-limit-period parameter

[Peter Xu <peterx@redhat.com>]

On Mon, Nov 21, 2022 at 11:26:36AM -0500, huangy81@chinatelecom.cn wrote:
> From: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
> 
> Introduce "x-vcpu-dirty-limit-period" migration experimental
> parameter, which is in the range of 1 to 1000ms and used to
> make dirtyrate calculation period configurable.
> 
> Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
> ---
>  migration/migration.c | 26 ++++++++++++++++++++++++++
>  monitor/hmp-cmds.c    |  8 ++++++++
>  qapi/migration.json   | 34 +++++++++++++++++++++++++++-------
>  3 files changed, 61 insertions(+), 7 deletions(-)
> 
> diff --git a/migration/migration.c b/migration/migration.c
> index 739bb68..701267c 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -116,6 +116,8 @@
>  #define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS    5
>  #define DEFAULT_MIGRATE_ANNOUNCE_STEP    100
>  
> +#define DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT_PERIOD     500     /* ms */
> +
>  static NotifierList migration_state_notifiers =
>      NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
>  
> @@ -963,6 +965,9 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
>                         s->parameters.block_bitmap_mapping);
>      }
>  
> +    params->has_x_vcpu_dirty_limit_period = true;
> +    params->x_vcpu_dirty_limit_period = s->parameters.x_vcpu_dirty_limit_period;
> +
>      return params;
>  }
>  
> @@ -1564,6 +1569,15 @@ static bool migrate_params_check(MigrationParameters *params, Error **errp)
>      }
>  #endif
>  
> +    if (params->has_x_vcpu_dirty_limit_period &&
> +        (params->x_vcpu_dirty_limit_period < 1 ||
> +         params->x_vcpu_dirty_limit_period > 1000)) {
> +        error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
> +                   "x_vcpu_dirty_limit_period",
> +                   "is invalid, it must be in the range of 1 to 1000 ms");
> +        return false;
> +    }
> +
>      return true;
>  }
>  
> @@ -1663,6 +1677,10 @@ static void migrate_params_test_apply(MigrateSetParameters *params,
>          dest->has_block_bitmap_mapping = true;
>          dest->block_bitmap_mapping = params->block_bitmap_mapping;
>      }
> +
> +    if (params->has_x_vcpu_dirty_limit_period) {
> +        dest->x_vcpu_dirty_limit_period = params->x_vcpu_dirty_limit_period;
> +    }
>  }
>  
>  static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
> @@ -1785,6 +1803,10 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
>              QAPI_CLONE(BitmapMigrationNodeAliasList,
>                         params->block_bitmap_mapping);
>      }
> +    if (params->has_x_vcpu_dirty_limit_period) {
> +        s->parameters.x_vcpu_dirty_limit_period =
> +            params->x_vcpu_dirty_limit_period;
> +    }
>  }
>  
>  void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
> @@ -4386,6 +4408,9 @@ static Property migration_properties[] = {
>      DEFINE_PROP_STRING("tls-creds", MigrationState, parameters.tls_creds),
>      DEFINE_PROP_STRING("tls-hostname", MigrationState, parameters.tls_hostname),
>      DEFINE_PROP_STRING("tls-authz", MigrationState, parameters.tls_authz),
> +    DEFINE_PROP_UINT64("x-vcpu-dirty-limit-period", MigrationState,
> +                       parameters.x_vcpu_dirty_limit_period,
> +                       DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT_PERIOD),
>  
>      /* Migration capabilities */
>      DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
> @@ -4477,6 +4502,7 @@ static void migration_instance_init(Object *obj)
>      params->has_tls_creds = true;
>      params->has_tls_hostname = true;
>      params->has_tls_authz = true;
> +    params->has_x_vcpu_dirty_limit_period = true;
>  
>      qemu_sem_init(&ms->postcopy_pause_sem, 0);
>      qemu_sem_init(&ms->postcopy_pause_rp_sem, 0);
> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
> index 01b789a..a3170ca 100644
> --- a/monitor/hmp-cmds.c
> +++ b/monitor/hmp-cmds.c
> @@ -513,6 +513,10 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
>                  }
>              }
>          }
> +
> +        monitor_printf(mon, "%s: %" PRIu64 " ms\n",
> +        MigrationParameter_str(MIGRATION_PARAMETER_X_VCPU_DIRTY_LIMIT_PERIOD),
> +        params->x_vcpu_dirty_limit_period);
>      }
>  
>      qapi_free_MigrationParameters(params);
> @@ -1332,6 +1336,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
>          error_setg(&err, "The block-bitmap-mapping parameter can only be set "
>                     "through QMP");
>          break;
> +    case MIGRATION_PARAMETER_X_VCPU_DIRTY_LIMIT_PERIOD:
> +        p->has_x_vcpu_dirty_limit_period = true;
> +        visit_type_size(v, param, &p->x_vcpu_dirty_limit_period, &err);
> +        break;
>      default:
>          assert(0);
>      }
> diff --git a/qapi/migration.json b/qapi/migration.json
> index 88ecf86..5175779 100644
> --- a/qapi/migration.json
> +++ b/qapi/migration.json
> @@ -776,8 +776,13 @@
>  #                        block device name if there is one, and to their node name
>  #                        otherwise. (Since 5.2)
>  #
> +# @x-vcpu-dirty-limit-period: Periodic time (ms) of dirty limit during live migration.
> +#                             Should be in the range 1 to 1000ms, defaults to 500ms.
> +#                             (Since 7.1)

Not 7.1 anymore but 7.3.  Yeah a bit sad.

> +#
>  # Features:
> -# @unstable: Member @x-checkpoint-delay is experimental.
> +# @unstable: Member @x-checkpoint-delay and @x-vcpu-dirty-limit-period
> +#            are experimental.
>  #
>  # Since: 2.4
>  ##
> @@ -795,8 +800,9 @@
>             'multifd-channels',
>             'xbzrle-cache-size', 'max-postcopy-bandwidth',
>             'max-cpu-throttle', 'multifd-compression',
> -           'multifd-zlib-level' ,'multifd-zstd-level',
> -           'block-bitmap-mapping' ] }
> +           'multifd-zlib-level', 'multifd-zstd-level',
> +           'block-bitmap-mapping',
> +           { 'name': 'x-vcpu-dirty-limit-period', 'features': ['unstable'] } ] }
>  
>  ##
>  # @MigrateSetParameters:
> @@ -941,8 +947,13 @@
>  #                        block device name if there is one, and to their node name
>  #                        otherwise. (Since 5.2)
>  #
> +# @x-vcpu-dirty-limit-period: Periodic time (ms) of dirty limit during live migration.
> +#                             Should be in the range 1 to 1000ms, defaults to 500ms.
> +#                             (Since 7.1)

Same here.

> +#
>  # Features:
> -# @unstable: Member @x-checkpoint-delay is experimental.
> +# @unstable: Member @x-checkpoint-delay and @x-vcpu-dirty-limit-period
> +#            are experimental.
>  #
>  # Since: 2.4
>  ##
> @@ -976,7 +987,9 @@
>              '*multifd-compression': 'MultiFDCompression',
>              '*multifd-zlib-level': 'uint8',
>              '*multifd-zstd-level': 'uint8',
> -            '*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ] } }
> +            '*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ],
> +            '*x-vcpu-dirty-limit-period': { 'type': 'uint64',
> +                                            'features': [ 'unstable' ] } } }
>  
>  ##
>  # @migrate-set-parameters:
> @@ -1141,8 +1154,13 @@
>  #                        block device name if there is one, and to their node name
>  #                        otherwise. (Since 5.2)
>  #
> +# @x-vcpu-dirty-limit-period: Periodic time (ms) of dirty limit during live migration.
> +#                             Should be in the range 1 to 1000ms, defaults to 500ms.
> +#                             (Since 7.1)

Same here.

> +#
>  # Features:
> -# @unstable: Member @x-checkpoint-delay is experimental.
> +# @unstable: Member @x-checkpoint-delay and @x-vcpu-dirty-limit-period
> +#            are experimental.
>  #
>  # Since: 2.4
>  ##
> @@ -1174,7 +1192,9 @@
>              '*multifd-compression': 'MultiFDCompression',
>              '*multifd-zlib-level': 'uint8',
>              '*multifd-zstd-level': 'uint8',
> -            '*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ] } }
> +            '*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ],
> +            '*x-vcpu-dirty-limit-period': { 'type': 'uint64',
> +                                            'features': [ 'unstable' ] } } }
>  
>  ##
>  # @query-migrate-parameters:
> -- 
> 1.8.3.1
> 
> 

-- 
Peter Xu