[Qemu-devel] [CFR 10/10] qmp: query_balloon command

[Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>]

query-balloon
-------------

Show balloon information.

Make an asynchronous request for balloon info. When the request completes a
json-object will be returned containing the following data:

- "actual": current balloon value in bytes (json-int)
- "mem_swapped_in": Amount of memory swapped in bytes (json-int, optional)
- "mem_swapped_out": Amount of memory swapped out in bytes (json-int, optional)
- "major_page_faults": Number of major faults (json-int, optional)
- "minor_page_faults": Number of minor faults (json-int, optional)
- "free_mem": Total amount of free and unused memory in
              bytes (json-int, optional)
- "total_mem": Total amount of available memory in bytes (json-int, optional)

Example:

-> { "execute": "query-balloon" }
<- {
      "return":{
         "actual":1073741824,
         "mem_swapped_in":0,
         "mem_swapped_out":0,
         "major_page_faults":142,
         "minor_page_faults":239245,
         "free_mem":1014185984,
         "total_mem":1044668416
      }
   }