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[Dongcan Ye <yedongcan@xxxxxxxx>]

Public bug reported:

>From the code, function _guest_add_memory_balloon in [1], if mem_stats_period_seconds set to 0 or negative value, the memory balloon device will disabled.
Is mem_stats_period_seconds can control the virtual memory balloon device added? Isn't it only control memory usage statistics?

But when I test with mem_stats_period_seconds=0, the virtual memory
balloon device will be added.

[1]
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py

** Affects: nova
     Importance: Undecided
     Assignee: Dongcan Ye (hellochosen)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Dongcan Ye (hellochosen)

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https://bugs.launchpad.net/bugs/1840139

Title:
  Libvirt: Wrong usage for mem_stats_period_seconds

Status in OpenStack Compute (nova):
  New

Bug description:
  From the code, function _guest_add_memory_balloon in [1], if mem_stats_period_seconds set to 0 or negative value, the memory balloon device will disabled.
  Is mem_stats_period_seconds can control the virtual memory balloon device added? Isn't it only control memory usage statistics?

  But when I test with mem_stats_period_seconds=0, the virtual memory
  balloon device will be added.

  [1]
  https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py

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