Re: [Qemu-devel] [PATCH v3] hmp, qmp: introduce "info memory" and "query-memory" commands

[Eric Blake]

On 06/27/2017 09:05 AM, Igor Mammedov wrote:
> On Wed, 14 Jun 2017 17:21:06 +0200
> Vadim Galitsyn <address@hidden> wrote:
> 

>> +void hmp_info_memory(Monitor *mon, const QDict *qdict)
>> +{
>> +    Error *err = NULL;
>> +    MemoryInfo *info = qmp_query_memory(&err);
>> +    if (info) {
>> +        monitor_printf(mon, "base-memory: %" PRIu64 "\n",
>> +                       info->base_memory);
>> +        monitor_printf(mon, "hot-plug-memory: %" PRIu64 "\n",
>> +                       info->hot_plug_memory);
> it shouldn't be printed if hotplug is not enabled

In which case, the QAPI change in the .json file should mark it as
'*hot-plug-memory', to make it an optional field, and you'll need to
check/set info->has_hot_plug_memory as appropriate.

> 
>> +        monitor_printf(mon, "ballooned-actual-memory: %" PRIu64 "\n",
>> +                       info->ballooned_actual_memory);
>> +        g_free(info);
> 
> probably there is autogenerated qapi_free_FOO() for MemInfo type

Yes, there is.

> since it's QAPI type, it should be used here instead of g_free() if it exists.

Yes, that is correct.


>> +#
>> +# @ballooned-actual-memory: amount of guest memory available after 
>> ballooning.
>> +#
>> +# Since: 2.10.0
>> +##
>> +{ 'struct': 'MemoryInfo',
>> +  'data'  : { 'base-memory': 'int',
>> 'hot-plug-memory': 'int',
> should be optional and shown only if hotplug is actually enabled
> 
>> +              'ballooned-actual-memory': 'int' } }
> maybe the same for ballooning

Yes, that makes sense to have both of those stats be optional, since
they are opt-in configurations.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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