Re: [Qemu-devel] [PATCH v3 4/5] qmp/hmp: Add throttle ratio to query-migrate and info migrate

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Jason J. Herne (jjherne@linux.vnet.ibm.com) wrote:
> Report throttle percentage in info migrate and query-migrate responses when
> cpu throttling is active.
> 
> Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  hmp.c                 | 5 +++++
>  migration/migration.c | 5 +++++
>  qapi-schema.json      | 7 ++++++-
>  3 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/hmp.c b/hmp.c
> index eb65998..36bc76e 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -229,6 +229,11 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
>                         info->xbzrle_cache->overflow);
>      }
>  
> +    if (info->has_x_cpu_throttle_percentage) {
> +        monitor_printf(mon, "cpu throttle percentage: %" PRIu64 "\n",
> +                       info->x_cpu_throttle_percentage);
> +    }
> +
>      qapi_free_MigrationInfo(info);
>      qapi_free_MigrationCapabilityStatusList(caps);
>  }
> diff --git a/migration/migration.c b/migration/migration.c
> index 7708c54..b29450a 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -274,6 +274,11 @@ MigrationInfo *qmp_query_migrate(Error **errp)
>              info->disk->total = blk_mig_bytes_total();
>          }
>  
> +        if (cpu_throttle_active()) {
> +            info->has_x_cpu_throttle_percentage = true;
> +            info->x_cpu_throttle_percentage = cpu_throttle_get_percentage();
> +        }
> +
>          get_xbzrle_cache_stats(info);
>          break;
>      case MIGRATION_STATUS_COMPLETED:
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 7dd324e..cd36256 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -474,6 +474,10 @@
>  #        may be expensive, but do not actually occur during the iterative
>  #        migration rounds themselves. (since 1.6)
>  #
> +# @x-cpu-throttle-percentage: #optional percentage of time guest cpus are being
> +#       throttled during auto-converge. This is only present when auto-converge
> +#       has started throttling guest cpus. (Since 2.4)
> +#
>  # Since: 0.14.0
>  ##
>  { 'struct': 'MigrationInfo',
> @@ -483,7 +487,8 @@
>             '*total-time': 'int',
>             '*expected-downtime': 'int',
>             '*downtime': 'int',
> -           '*setup-time': 'int'} }
> +           '*setup-time': 'int',
> +           '*x-cpu-throttle-percentage': 'int'} }
>  
>  ##
>  # @query-migrate
> -- 
> 1.9.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK