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[Stephen Finucane <1840139@xxxxxxxxxxxxxxxxxx>]

I'm not entirely sure what the issue is here, but this doesn't sound
like a bug per sé. At least, it's not something an end user will
encounter.

** Changed in: nova
       Status: In Progress => Invalid

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

Title:
  Libvirt: Correct usage _guest_add_memory_balloon

Status in OpenStack Compute (nova):
  Invalid

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 usage statistics will disabled.
  Is mem_stats_period_seconds can control the virtual memory balloon device added? Isn't it only control memory usage statistics?

  The virtual memory balloon device will be added by Libvirt as a
  default behavior.[2]

  So the name "_guest_add_memory_balloon" maybe misleading.

  [1] https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py
  [2] https://libvirt.org/formatdomain.html#elementsMemBalloon

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