Comment 12 for bug 1729371

Reviewed: https://review.openstack.org/608575
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=8e463aa719be5446bb3cff7263274bf7d911aac0
Submitter: Zuul
Branch: stable/rocky

commit 8e463aa719be5446bb3cff7263274bf7d911aac0
Author: Matt Riedemann <email address hidden>
Date: Wed Nov 1 17:04:45 2017 -0400

    Time how long select_destinations() takes in conductor

    When we see weird bugs due to race windows, like bug 1729371,
    it would be good to know if we're spending an inordinate amount
    of time in the scheduler selecting destinations because that
    can have a real effect on things happening before the instance
    is created in a cell during the initial create.

    Change-Id: I395ac34189c9fc010a37d4a73fac151d0f625ba2
    Related-Bug: #1729371
    (cherry picked from commit bf92b72ce9307e2faf220a75ca858289cf46406c)