Re: [PATCH] tools: remove unused wrappers for python

[Zhigang Wang <zhigang.x.wang@oracle.com>]

On 10/08/2015 11:27 AM, Ian Campbell wrote:
> On Thu, 2015-10-08 at 11:09 -0400, Zhigang Wang wrote:
>> On 10/08/2015 10:38 AM, Ian Campbell wrote:
>>> On Tue, 2015-10-06 at 11:24 -0400, Zhigang Wang wrote:
>>>> We use these extentions along with xend XMLRPC API/xm. Even when move
>>>> to
>>>> xl, this will give us a choice to reserve some logic.
>>>
>>> There are a lot of interfaces here, are you using all of them? If not
>>> then
>>> could you enumerate the ones you care about please.
>>
>> Currently we are using:
>>
>>  xc.getcpuinfo()
>>  xc.domain_getinfo()
> 
> Thanks.
> 
>> But after switching to xl, we cannot get info from xend any more, then some of
>> these interfaces may be helpful.
> 
> Do you have any insight into what info you currently get from xend which
> you don't think you can get from xl?
> 
> It may be that there are gaps in the xl functionality which should be
> filled, rather than keeping the Python xc bindings around (equally there
> may be things where those bindings are the best solution).

We mainly use these APIs for domain statistics, like:

  ============================ ===== ==== ===================================
  Statistic                    Type  Unit Note
  ============================ ===== ==== ===================================
  cpuMap                       int        VM vcpus to physical cpus map list.
  cpuTime                      float Sec  VM accumulated CPU time.
  cpuUtil                      float      VM CPU average utilization.
                                          Range: 0.0 - 1.0.
  currentMemory                long  MiB  VM current memory.
  domainId                     int        VM domain ID.
  ephemeralTranscendentMemory  long  MiB  VM Ephemeral tmem.
  maxMemory                    long  MiB  VM maximum memory.
  onlineVcpus                  int        VM online VCPUs.
  persistentTranscendentMemory long  MiB  VM persistent tmem.
  targetMemory                 long  MiB  VM target memory.
  ============================ ===== ==== ===================================

I have a POC implementation of these statistics using xl, the only needed APIs are:

  xc.getcpuinfo()
  xc.domain_getinfo()
  xc.tmem_control()

I haven't checked whether xl CLI has alternatives for all of these. These xc APIs
seem fit our need.

Thanks,

Zhigang