Re: [RFC PATCH v2 3/5] virtio-balloon: Add QMP functions for Working Set

[David Hildenbrand <david@redhat.com>]

On 26.05.23 00:20, T.J. Alumbaugh wrote:
>    - Adds QMP function 'working-set-config'
>    - Adds QMP function 'working-set-request'
>    - Retrieve working set via 'guest-working-set' property on balloon
> 
>>> cat script.py
> 
> NAME = "name"
> SOCKET = 'vm.sock'
> BALLOON =  "/machine/peripheral/balloon0"
> 
> import json
> import asyncio
> from qemu.qmp import QMPClient
> 
> async def main():
>      client = QMPClient(NAME)
>      await client.connect(SOCKET)
>      config = { "i0": 200, "i1": 800, "i2": 3000, "refresh": 750, "report": 1000 }
>      await client.execute('working-set-config', config)
>      await client.execute('working-set-request')
>      property = {"path":BALLOON, "property":"guest-working-set"}
>      res = await client.execute('qom-get', property)
>      return res
> 
> if __name__ == "__main__":
>      ret = asyncio.run(main())
>      print(json.dumps(ret, indent=2))
> 
>>> (Execute qemu with flag '-qmp unix:path=vm.sock,server=on,wait=off'
>>> (Perform normal activities on VM to exercise MM code)
> 
>>> python3 script.py
> {
>    "working_set": {
>      "ws3": {
>        "memory-size-bytes": {
>          "anon": 890478592,
>          "file": 1285832704
>        },
>        "idle-age": 4294967292
>      },
>      "ws2": {
>        "memory-size-bytes": {
>          "anon": 173465600,
>          "file": 83353600
>        },
>        "idle-age": 3000
>      },
>      "ws1": {
>        "memory-size-bytes": {
>          "anon": 44236800,
>          "file": 20889600
>        },
>        "idle-age": 800
>      },
>      "ws0": {
>        "memory-size-bytes": {
>          "anon": 14540800,
>          "file": 6963200
>        },
>        "idle-age": 200
>      }
>    }
> }

Would it be possible to model that as QOM property instead? Then, we 
could use qom-get/qom-set on the device instead of having to craft new 
QMP/HMP functions.

-- 
Thanks,

David / dhildenb