OpenStack Compute (nova)

Libvirt driver emulator threads placement policy

Registered by Daniel Berrange

The Nova schedular determines CPU resource utilization and instance CPU placement based on the number of vCPUs in the flavour. A number of hypervisors have work that is performed in the host OS on behalf of a guest instance, which does not take place in association with a vCPU. This is currently unaccounted for in Nova scheduling and cannot have any placement policy controls applied.

Blueprint information

Status:
Complete
Approver:
Dan Smith
Priority:
Low
Drafter:
Daniel Berrange
Direction:
Approved
Assignee:
Sahid Orentino
Definition:
Approved
Series goal:
Accepted for pike
Implementation:
Implemented
Milestone target:
milestone icon pike-1
Started by
Matt Riedemann
Completed by
Matt Riedemann

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/libvirt-emulator-threads-policy,n,z

Addressed by: https://review.openstack.org/225893
    Libvirt driver emulator threads placement policy

Addressed by: https://review.openstack.org/284094
    Libvirt driver emulator threads placement policy

Addressed by: https://review.openstack.org/385022
    object: add new field cpu_emulator_threads_policy

Addressed by: https://review.openstack.org/385023
    virt: add numa constraint for emulator threads policy

Addressed by: https://review.openstack.org/385024
    virt: update overhead to take into account vCPUs

Addressed by: https://review.openstack.org/385364
    libvirt: return overhead if isolate emulator threads requested

Addressed by: https://review.openstack.org/400874
    objects: add new field cpus_overhead in NUMACell

Addressed by: https://review.openstack.org/400876
    numa: take into account cpus overhead

Addressed by: https://review.openstack.org/400877
    numa: update numa usage incording the cpu overhead

Addressed by: https://review.openstack.org/400878
    libvirt: make emulator threads to run on the reserved pCPU

Addressed by: https://review.openstack.org/400875
    numa: fit instance toplogy with cpu overhead onto cores

Addressed by: https://review.openstack.org/406081
    Add support for image metadata

We're now past the feature freeze for Ocata so I've deferred the rest of this to Pike. -- mriedem 20170128

Addressed by: https://review.openstack.org/427066
    Libvirt driver emulator threads placement policy

Re-approved for Pike. -- mriedem 20170303

Addressed by: https://review.openstack.org/501205
    objects: add new field MASK for emulator threads policy

Addressed by: https://review.openstack.org/501206
    objects: add cpu_emulator_threads_mask field

Addressed by: https://review.openstack.org/501207
    hardware: add method to get emulator threads mask

Addressed by: https://review.openstack.org/501208
    hardware: handle/check emulator threads mask constraints

Addressed by: https://review.openstack.org/501209
    hardware: add method to compute emulator threads placement

Addressed by: https://review.openstack.org/501210
    libvirt: configure emulator threads of a guest based on mask

(?)

Work Items

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