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[Jay Pipes <1303481@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Performance improvement is possible by caching the values from the
global CONF object that are repeatedly access, including
CONF.scheduler_default_filters and CONF.scheduler_default_filters (see
patch here:
https://review.openstack.org/#/c/85594/3/nova/scheduler/host_manager.py)
and CONF.scheduler_weight_classes.

Avoiding CONF lookups where possible is just good practice.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: low-hanging-fruit performance scheduler

** Tags added: low-hanging-fruit

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https://bugs.launchpad.net/bugs/1303481

Title:
  nova.scheduler.host_manager should cache CONF values

Status in OpenStack Compute (Nova):
  New

Bug description:
  Performance improvement is possible by caching the values from the
  global CONF object that are repeatedly access, including
  CONF.scheduler_default_filters and CONF.scheduler_default_filters (see
  patch here:
  https://review.openstack.org/#/c/85594/3/nova/scheduler/host_manager.py)
  and CONF.scheduler_weight_classes.

  Avoiding CONF lookups where possible is just good practice.

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