With this patch set, an unmodified application would either use: 1) whatever memory it happened to get 2) only the faster dram (via numactl --membind=) 3) only the slower pmem (again, via numactl --membind1) 4) preferentially one or the other (numactl --preferred=)
Yet another option: MemoryOptimizer -- hot page accounting and migration daemon https://github.com/intel/memory-optimizer Once PMEM NUMA nodes are available, we may run a user space daemon to walk page tables of virtual machines (EPT) or processes, collect the "accessed" bits to find out hot pages, and finally migrate hot pages to DRAM and cold pages to PMEM. In that scenario, only kernel and the migrate daemon need to be aware of the PMEM nodes. Unmodified virtual machines and processes can enjoy the added memory space w/o knowing whether it's using DRAM or PMEM. Thanks, Fengguang
