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[Geza Gemes <geza.gemes@xxxxxxxxxxxx>]

The problem is valid, the proposed solution can be discussed. I will
start a blueprint about it shortly.

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

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https://bugs.launchpad.net/bugs/1266415

Title:
  Compute node reports wrong amount of free memory

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  In nova/compute/resource_tracker.py in the definition of the
  _update_usage_from_instances function the amount of free memory
  reported by the hypervisor layer gets overwriten by the amount of
  configured host reserved memory:

  resources['memory_mb_used'] = CONF.reserved_host_memory_mb

  If the compute host uses more memory (not counting the VMs memory
  usage) than the reserved_host_memory, it results in erroneus free
  memory reporting by the compute host and consequently to suboptimal
  scheduling.

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