Add hardware.memory.buffer and hardware.memory.cached metrics

https://blueprints.launchpad.net/ceilometer/+spec/hardware-memory-buffer-and-cache-metrics

Add hardware.memory.buffer and hardware.memory.cached metrics to monitor the memory buffer size and memory cache size of a physical machine through SNMP.

Problem description

Currently Ceilometer only support 4 memory oid of SNMP:
_memory_total_oid = “1.3.6.1.4.1.2021.4.5.0” _memory_avail_real_oid = “1.3.6.1.4.1.2021.4.6.0” _memory_total_swap_oid = “1.3.6.1.4.1.2021.4.3.0” _memory_avail_swap_oid = “1.3.6.1.4.1.2021.4.4.0”

But in practice, memory cache and buffer size are also very useful information to determine the status of a physical machine.

Proposed change

Add two metrics, hardware.memory.buffer and hardware.memory.cached, to monitor the memory buffer size and memory cache size of a physical machine.

To achieve this, we need add two SNMP oid and two hardware pollsters.

Firstly, add two oid in SNMP inspector:

_memory_buffer_oid = “1.3.6.1.4.1.2021.4.14.0” _memory_cached_oid = “1.3.6.1.4.1.2021.4.15.0”

Secondly, add two Hardware Pollsters in hardware.pollsters.memory:

  • MemoryBufferPollster
  • MemoryCachedPollster

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:
luogangyi

Work Items

  • Add two oid in SNMP inspector:

    _memory_buffer_oid = “1.3.6.1.4.1.2021.4.14.0” _memory_cached_oid = “1.3.6.1.4.1.2021.4.15.0”

  • Add two Hardware Pollsters in hardware.pollsters.memory:

    • MemoryBufferPollster
    • MemoryCachedPollster

Future lifecycle

None

Dependencies

None

Testing

Need unit test

Documentation Impact

None

References

[1] oid references http://www.net-snmp.org/docs/mibs/ucdavis.html