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[Balazs Gibizer <2075959@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When the instance request mem pages via symbolic names (e.g. "large"
instead of specifying the exact size) and the instance does not fit to a
NUMA cell due to the memory requirements nova logs are confusing:

./nova-scheduler-scheduler.log:2024-07-31 23:37:28.428 1 DEBUG
nova.virt.hardware [None req-c3efb10b-641c-4066-a569-206226315366
f05a486d957b4e6082293ce5e707009d 8c8a6763e6924cd3a94427af5f8ef6ee - -
default default] Host does not support requested memory pagesize, or not
enough free pages of the requested size. Requested: -2 kB
_numa_fit_instance_cell /usr/lib/python3.9/site-
packages/nova/virt/hardware.py:944

This happens because the symbolic name translated to a negative integer
placeholder inside nova. So when the field is printed it should be
translated back to the symbolic name instead.


https://github.com/openstack/nova/blob/bb2d7f9cad577f3a32cb9523e2b1d9a6d6db3407/nova/virt/hardware.py#L943-L946

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: low-hanging-fruit numa

** Tags added: low-hanging-fruit numa

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https://bugs.launchpad.net/bugs/2075959

Title:
  NUMATopologyFilter pagesize logs are missleading

Status in OpenStack Compute (nova):
  New

Bug description:
  When the instance request mem pages via symbolic names (e.g. "large"
  instead of specifying the exact size) and the instance does not fit to
  a NUMA cell due to the memory requirements nova logs are confusing:

  ./nova-scheduler-scheduler.log:2024-07-31 23:37:28.428 1 DEBUG
  nova.virt.hardware [None req-c3efb10b-641c-4066-a569-206226315366
  f05a486d957b4e6082293ce5e707009d 8c8a6763e6924cd3a94427af5f8ef6ee - -
  default default] Host does not support requested memory pagesize, or
  not enough free pages of the requested size. Requested: -2 kB
  _numa_fit_instance_cell /usr/lib/python3.9/site-
  packages/nova/virt/hardware.py:944

  This happens because the symbolic name translated to a negative
  integer placeholder inside nova. So when the field is printed it
  should be translated back to the symbolic name instead.

  
  https://github.com/openstack/nova/blob/bb2d7f9cad577f3a32cb9523e2b1d9a6d6db3407/nova/virt/hardware.py#L943-L946

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