Adds resident memory size meter to libvirt inspector

https://blueprints.launchpad.net/ceilometer/+spec/memory-resident

Memory statistics include just the actual usage inside the Virtual Machine. The ‘memory.resident’ metric will add the resident memory size. The implementation is done in the libvirt inspector. The value will be fetched using the libvirt API and the ‘rss’ for dommemstats.

Problem description

Resident memory is important to see the amount of memory consumed by the Virtual Machine from the Physical Host. This spec adds the resident memory statistics to the libvirt inspector.

Proposed change

Implements the method ‘inspect_memory_resident’ of LibvirtInspector, fetches the rss value for memory from libvirt API ‘virDomainMemoryStats’. The libvirt API ‘virDomainMemoryStats’.

Alternatives

None

Data model impact

None

REST API impact

None

Security impact

None

Pipeline impact

None

Other end user impact

None

Performance/Scalability Impacts

None

Other deployer impact

None

Developer impact

None

Implementation

Assignee(s)

Primary assignee:
vivek-nandavanam

Work Items

  • Implements the method ‘inspect_memory_resident’ of LibvirtInspector.
  • Updates ceilometer measurements document.

Future lifecycle

Once this feature enabled, need test and bug fixing in next 2 releases to avoid regression.

Dependencies

  • libvirt 0.7.5

Testing

Unit tests should be sufficient.