A mechanism for tracking memory accesses in a non-uniform memory access (NUMA) system to optimize processor task placement is disclosed. A method of embodiments of the invention includes creating a page table (PT) hierarchy associated with a thread to be run on a processor of a computing device, collecting access bit information from the PT hierarchy associated with the thread, wherein the access bit information includes any access bits in the PT hierarchy that are set by a memory management unit (MMU) of the processor to identify a page of memory accessed by the thread, determining memory access statistics for the thread, and utilizing the memory access statistics for the thread in a determination of whether to migrate the thread to another processor.