Re: [Qemu-devel] [v3 13/13] migration: Add command to query migration parameter

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

* Liang Li (liang.z.li@intel.com) wrote:
> Add the qmp and hmp commands to query the parameters used in live
> migration.

Eric: I'm OK with this,  but since it's interface stuff, I thought
it best to let you check.

Dave

> 
> Signed-off-by: Liang Li <liang.z.li@intel.com>
> Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
> ---
>  hmp-commands.hx  |  2 ++
>  hmp.c            | 19 +++++++++++++++++++
>  hmp.h            |  1 +
>  migration.c      | 25 +++++++++++++++++++++++++
>  monitor.c        |  7 +++++++
>  qapi-schema.json | 10 ++++++++++
>  qmp-commands.hx  | 24 ++++++++++++++++++++++++
>  7 files changed, 88 insertions(+)
> 
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index 535b5ba..ed0c06a 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -1779,6 +1779,8 @@ show user network stack connection states
>  show migration status
>  @item info migrate_capabilities
>  show current migration capabilities
> +@item info migrate_parameters
> +show current migration parameters
>  @item info migrate_cache_size
>  show current migration XBZRLE cache size
>  @item info balloon
> diff --git a/hmp.c b/hmp.c
> index 965c037..b321b15 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -246,6 +246,25 @@ void hmp_info_migrate_capabilities(Monitor *mon, const QDict *qdict)
>      qapi_free_MigrationCapabilityStatusList(caps);
>  }
>  
> +void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
> +{
> +    MigrationParameterStatusList *params, *p;
> +
> +    params = qmp_query_migrate_parameters(NULL);
> +
> +    if (params) {
> +        monitor_printf(mon, "parameters: ");
> +        for (p = params; p; p = p->next) {
> +            monitor_printf(mon, "%s: %d ",
> +                           MigrationParameter_lookup[p->value->parameter],
> +                           (int)p->value->value);
> +        }
> +        monitor_printf(mon, "\n");
> +    }
> +
> +    qapi_free_MigrationParameterStatusList(params);
> +}
> +
>  void hmp_info_migrate_cache_size(Monitor *mon, const QDict *qdict)
>  {
>      monitor_printf(mon, "xbzrel cache size: %" PRId64 " kbytes\n",
> diff --git a/hmp.h b/hmp.h
> index bd1b203..471417c 100644
> --- a/hmp.h
> +++ b/hmp.h
> @@ -28,6 +28,7 @@ void hmp_info_chardev(Monitor *mon, const QDict *qdict);
>  void hmp_info_mice(Monitor *mon, const QDict *qdict);
>  void hmp_info_migrate(Monitor *mon, const QDict *qdict);
>  void hmp_info_migrate_capabilities(Monitor *mon, const QDict *qdict);
> +void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict);
>  void hmp_info_migrate_cache_size(Monitor *mon, const QDict *qdict);
>  void hmp_info_cpus(Monitor *mon, const QDict *qdict);
>  void hmp_info_block(Monitor *mon, const QDict *qdict);
> diff --git a/migration.c b/migration.c
> index d3d377e..f87aba3 100644
> --- a/migration.c
> +++ b/migration.c
> @@ -179,6 +179,31 @@ MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
>      return head;
>  }
>  
> +MigrationParameterStatusList *qmp_query_migrate_parameters(Error **errp)
> +{
> +    MigrationParameterStatusList *head = NULL;
> +    MigrationParameterStatusList *params;
> +    MigrationState *s = migrate_get_current();
> +    int i;
> +
> +    params = NULL; /* silence compiler warning */
> +    for (i = 0; i < MIGRATION_PARAMETER_MAX; i++) {
> +        if (head == NULL) {
> +            head = g_malloc0(sizeof(*params));
> +            params = head;
> +        } else {
> +            params->next = g_malloc0(sizeof(*params));
> +            params = params->next;
> +        }
> +        params->value =
> +            g_malloc(sizeof(*params->value));
> +        params->value->parameter = i;
> +        params->value->value = s->parameters[i];
> +    }
> +
> +    return head;
> +}
> +
>  static void get_xbzrle_cache_stats(MigrationInfo *info)
>  {
>      if (migrate_use_xbzrle()) {
> diff --git a/monitor.c b/monitor.c
> index 4cf62b6..6ab269f 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -2862,6 +2862,13 @@ static mon_cmd_t info_cmds[] = {
>          .mhandler.cmd = hmp_info_migrate_capabilities,
>      },
>      {
> +        .name       = "migrate_parameters",
> +        .args_type  = "",
> +        .params     = "",
> +        .help       = "show current migration parameters",
> +        .mhandler.cmd = hmp_info_migrate_parameters,
> +    },
> +    {
>          .name       = "migrate_cache_size",
>          .args_type  = "",
>          .params     = "",
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 2caeccc..ccdb6b2 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -584,6 +584,16 @@
>  { 'command': 'migrate-set-parameters',
>    'data': { 'parameters': ['MigrationParameterStatus'] } }
>  ##
> +# @query-migrate-parameters
> +#
> +# Returns information about the current migration parameters status
> +#
> +# Returns: @MigrationParametersStatus
> +#
> +# Since: 2.3
> +##
> +{ 'command': 'query-migrate-parameters', 'returns':   ['MigrationParameterStatus']}
> +##
>  ##
>  # @MouseInfo:
>  #
> diff --git a/qmp-commands.hx b/qmp-commands.hx
> index 59d2643..986eb95 100644
> --- a/qmp-commands.hx
> +++ b/qmp-commands.hx
> @@ -3248,6 +3248,30 @@ EQMP
>  	.mhandler.cmd_new = qmp_marshal_input_migrate_set_parameters,
>      },
>  SQMP
> +query-migrate-parameters
> +------------------------
> +
> +Query current migration parameters
> +
> +- "parameters": migration parameters value
> +         - "compress-level" : compress level value (json-int)
> +
> +Arguments:
> +
> +Example:
> +
> +-> { "execute": "query-migrate-parameters" }
> +<- { "return": [ { "value": 1, "parameter": "compress-level" } ] }
> +
> +EQMP
> +
> +    {
> +        .name       = "query-migrate-parameters",
> +        .args_type  = "",
> +        .mhandler.cmd_new = qmp_marshal_input_query_migrate_parameters,
> +    },
> +
> +SQMP
>  query-balloon
>  -------------
>  
> -- 
> 1.8.3.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK