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[Jim Rollenhagen <jim@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

This commit introduces instance tracking in the scheduler, with an
option to disable it for performance.
https://github.com/openstack/nova/commit/82cc056fb7e1b081a733797ed27550343cbaf44c

However, _add_instance_info is not guarded by the config option, but
causes just as much performance havoc as the initial load.
https://github.com/openstack/nova/commit/82cc056fb7e1b081a733797ed27550343cbaf44c
#diff-978b9f8734365934eaf8fbb01f11a7d7R554

This should be guarded by the config.

** Affects: nova
     Importance: Undecided
     Assignee: Jim Rollenhagen (jim-rollenhagen)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1479124

Title:
  Scheduler doesn't respect tracks_instance_changes in all cases

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  This commit introduces instance tracking in the scheduler, with an
  option to disable it for performance.
  https://github.com/openstack/nova/commit/82cc056fb7e1b081a733797ed27550343cbaf44c

  However, _add_instance_info is not guarded by the config option, but
  causes just as much performance havoc as the initial load.
  https://github.com/openstack/nova/commit/82cc056fb7e1b081a733797ed27550343cbaf44c
  #diff-978b9f8734365934eaf8fbb01f11a7d7R554

  This should be guarded by the config.

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