Expose memspace and policy API for managing host memory

A memspace is an ordered collection of one or more memory targets. It can represent a certain class of memory sources like all NUMA nodes in the system or contain memory targets with different properties (e.g., latency).

A memory target represents a single memory source (e.g., NUMA node) and can have certain attributes (e.g., capacity).

Memspaces to expose (should be exposed as functions or a single function accepting an enum to avoid problems with exporting variables on windows):

• UMF_MEMSPACE_HOST_ALL
• UMF_MEMSPACE_HBW
• UMF_MEMSPACE_LOWEST_LATENCY
• UMF_MEMSPACE_HIGHEST_CAPACITY
• UMF_MEMSPACE_HIGHEST_BANDWITH

Memspace attributes to expose:

• Capacity
• Latency (as distance to local node / other nodes)
• Bandwidth
• Numa node id

Memspace management API:

• Filtering based on one (or more) of the attributes
• Sorting based on one (or more) of the attributes
• Iteration over memory targets within a memspace

All memspaces should be a part of libumf (not separate libraries).

Memspace, along with a policy, can be used to create pools and providers (umfPoolCreateFromMemspace and umfMemoryProviderCreateFromMemspace). Implementation of umfPoolCreateFromMemspace should select the best-suited pool based on memspace and policy type and availability of memory pools.

Policies to expose:

• UMF_MEMSPACE_POLICY_STRICT
• UMF_MEMSPACE_POLICY_PREFERRED
• UMF_MEMSPACE_POLICY_BLOCKED
• UMF_MEMSPACE_POLICY_INTERLEAVED
• UMF_MEMSPACE_POLICY_LOCAL

Optional:

• expose system-level memory metrics for memspaces (.e.g total available/free/allocated memory)