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[shews <1972759@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========
Now the ram filter for nova scheduler only cares about the amount of memory allocated for instance, not cares about the real-time memory usage.
If a host has enough allocated memory, but hasn't enough real-time memory for instance, the new instance can scheduler to this host but failed to start, this will cause instance's creation fail and instance's status become error.

Maybe we can add a period tasks to collect real-time memory usage for
host, and add a real time ram filter to ignore that host hasn't enough
real time memory for instance?

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1972759

Title:
  maybe we need a real time ram filter?

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  Now the ram filter for nova scheduler only cares about the amount of memory allocated for instance, not cares about the real-time memory usage.
  If a host has enough allocated memory, but hasn't enough real-time memory for instance, the new instance can scheduler to this host but failed to start, this will cause instance's creation fail and instance's status become error.

  Maybe we can add a period tasks to collect real-time memory usage for
  host, and add a real time ram filter to ignore that host hasn't enough
  real time memory for instance?

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