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[Alexander Schmidt <alexs@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When adding or removing CPUs to a compute node running the libvirt
driver, the correct new amount of CPUs is not reported to the
controller/scheduler.

As a result, the scheduler will not consider added or removed capacity
in future scheduling decisions.

To fix this, the number of CPUs on a compute node should not be cached
in the libvirt driver. Instead it should be recalculated in the periodic
task for updating resource availability.

I'll provide a patch for fixing the bug along with a unit test.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1460043

Title:
  libvirt: number of CPUs is not updated after hotplugging host CPUs

Status in OpenStack Compute (Nova):
  New

Bug description:
  When adding or removing CPUs to a compute node running the libvirt
  driver, the correct new amount of CPUs is not reported to the
  controller/scheduler.

  As a result, the scheduler will not consider added or removed capacity
  in future scheduling decisions.

  To fix this, the number of CPUs on a compute node should not be cached
  in the libvirt driver. Instead it should be recalculated in the
  periodic task for updating resource availability.

  I'll provide a patch for fixing the bug along with a unit test.

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