Re: [Qemu-devel] [PATCH v6 08/19] migration: Create x-multifd-group parameter

["Daniel P. Berrange" <berrange@redhat.com>]

On Tue, Aug 08, 2017 at 06:26:18PM +0200, Juan Quintela wrote:
> Indicates how many pages we are going to send in each batch to a multifd
> thread.
> 
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> 
> --
> 
> Be consistent with defaults and documentation
> Use new DEFINE_PROP_*
> ---
>  hmp.c                 |  7 +++++++
>  migration/migration.c | 26 ++++++++++++++++++++++++++
>  migration/migration.h |  1 +
>  qapi-schema.json      | 17 ++++++++++++++---
>  4 files changed, 48 insertions(+), 3 deletions(-)
> 
> diff --git a/hmp.c b/hmp.c
> index 7899813..a52035a 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -340,6 +340,9 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
>          monitor_printf(mon, "%s: %" PRId64 "\n",
>              MigrationParameter_lookup[MIGRATION_PARAMETER_X_MULTIFD_THREADS],
>              params->x_multifd_threads);
> +        monitor_printf(mon, "%s: %" PRId64 "\n",
> +            MigrationParameter_lookup[MIGRATION_PARAMETER_X_MULTIFD_GROUP],
> +            params->x_multifd_group);
>      }
>  
>      qapi_free_MigrationParameters(params);
> @@ -1629,6 +1632,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
>                  p->has_x_multifd_threads = true;
>                  visit_type_int(v, param, &p->x_multifd_threads, &err);
>                  break;
> +            case MIGRATION_PARAMETER_X_MULTIFD_GROUP:
> +                p->has_x_multifd_group = true;
> +                visit_type_int(v, param, &p->x_multifd_group, &err);
> +                break;
>              }
>  
>              if (err) {
> diff --git a/migration/migration.c b/migration/migration.c
> index 6ed9600..6c4eb4b 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -79,6 +79,7 @@
>   */
>  #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200
>  #define DEFAULT_MIGRATE_MULTIFD_THREADS 2
> +#define DEFAULT_MIGRATE_MULTIFD_GROUP 16
>  
>  static NotifierList migration_state_notifiers =
>      NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
> @@ -486,6 +487,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
>      params->block_incremental = s->parameters.block_incremental;
>      params->has_x_multifd_threads = true;
>      params->x_multifd_threads = s->parameters.x_multifd_threads;
> +    params->has_x_multifd_group = true;
> +    params->x_multifd_group = s->parameters.x_multifd_group;
>  
>      return params;
>  }
> @@ -774,6 +777,13 @@ static bool migrate_params_check(MigrationParameters *params, Error **errp)
>                     "is invalid, it should be in the range of 1 to 255");
>          return false;
>      }
> +    if (params->has_x_multifd_group &&
> +            (params->x_multifd_group < 1 || params->x_multifd_group > 10000)) {
> +        error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
> +                   "multifd_group",
> +                   "is invalid, it should be in the range of 1 to 10000");
> +        return false;
> +    }
>  
>      return true;
>  }
> @@ -895,6 +905,9 @@ static void migrate_params_apply(MigrateSetParameters *params)
>      if (params->has_x_multifd_threads) {
>          s->parameters.x_multifd_threads = params->x_multifd_threads;
>      }
> +    if (params->has_x_multifd_group) {
> +        s->parameters.x_multifd_group = params->x_multifd_group;
> +    }
>  }
>  
>  void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
> @@ -1481,6 +1494,15 @@ int migrate_multifd_threads(void)
>      return s->parameters.x_multifd_threads;
>  }
>  
> +int migrate_multifd_group(void)
> +{
> +    MigrationState *s;
> +
> +    s = migrate_get_current();
> +
> +    return s->parameters.x_multifd_group;
> +}
> +
>  int migrate_use_xbzrle(void)
>  {
>      MigrationState *s;
> @@ -2249,6 +2271,9 @@ static Property migration_properties[] = {
>      DEFINE_PROP_INT64("x-multifd-threads", MigrationState,
>                        parameters.x_multifd_threads,
>                        DEFAULT_MIGRATE_MULTIFD_THREADS),
> +    DEFINE_PROP_INT64("x-multifd-group", MigrationState,
> +                      parameters.x_multifd_group,
> +                      DEFAULT_MIGRATE_MULTIFD_GROUP),
>  
>      /* Migration capabilities */
>      DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
> @@ -2307,6 +2332,7 @@ static void migration_instance_init(Object *obj)
>      params->has_x_checkpoint_delay = true;
>      params->has_block_incremental = true;
>      params->has_x_multifd_threads = true;
> +    params->has_x_multifd_group = true;
>  }
>  
>  /*
> diff --git a/migration/migration.h b/migration/migration.h
> index 8e4803d..ddf8c89 100644
> --- a/migration/migration.h
> +++ b/migration/migration.h
> @@ -176,6 +176,7 @@ bool migrate_zero_blocks(void);
>  bool migrate_auto_converge(void);
>  bool migrate_use_multifd(void);
>  int migrate_multifd_threads(void);
> +int migrate_multifd_group(void);
>  
>  int migrate_use_xbzrle(void);
>  int64_t migrate_xbzrle_cache_size(void);
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 3fe1a64..2d4dbd3 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -1049,6 +1049,9 @@
>  #                     number of sockets used for migration.
>  #                     The default value is 2 (since 2.11)
>  #
> +# @x-multifd-group: Number of pages sent together to a thread
> +#                   The default value is 16 (since 2.11)
> +#
>  # Since: 2.4
>  ##
>  { 'enum': 'MigrationParameter',
> @@ -1056,7 +1059,7 @@
>             'cpu-throttle-initial', 'cpu-throttle-increment',
>             'tls-creds', 'tls-hostname', 'max-bandwidth',
>             'downtime-limit', 'x-checkpoint-delay', 'block-incremental',
> -           'x-multifd-threads'] }
> +           'x-multifd-threads', 'x-multifd-group'] }
>  
>  ##
>  # @MigrateSetParameters:
> @@ -1117,6 +1120,9 @@
>  #                     number of sockets used for migration.
>  #                     The default value is 2 (since 2.11)
>  #
> +# @x-multifd-group: Number of pages sent together to a thread
> +#                   The default value is 16 (since 2.11)

Bikesheeding - how about  "x-multifd-page-count"  ?  'group' didn't
give me much idea what it was controlling until reading the docs.


Regards,
Daniel
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