NUMA policy and memory types

Non-uniform memory access (NUMA) systems have an architecture that attaches memory to "nodes" within the system. CPUs, too, belong to nodes; memory that is attached to the same node as a CPU will be faster to access (from that CPU) than memory on other nodes. This aspect of performance has important implications for programs running on NUMA systems, and the kernel offers a number of ways for user space to optimize their behavior. The NUMA abstraction is now being extended, though, and that is driving a need for new ways of influencing memory allocation; the multi-preference memory policy patch set is an attempt to meet that need.

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