support linux.cgroupsPath and linux.resources (resource constraints)

[sameo]

From @jodh-intel on August 22, 2016 13:27

The OCI config file, config.json, specifies resource constraints in the form of linux.resources JSON objects which map closely to cgroups.

We need to find a way to implement such constraints.

See:

• https://github.com/opencontainers/runtime-spec/blob/master/config-linux.md#control-groups

Copied from original issue: intel/cc-oci-runtime#148

[sameo]

Most of the resource constraints would need to be applied to the qemu process, a.k.a. the VM, by either using cgroups on the host or map the restrictions to qemu parameters (CPU, memory...).

[grahamwhaley]

Also likely directly related to at least #380 and #381. It feels like the cgroups settings can be set or adjusted through a number of different docker run or update arguments.