[$] Some upcoming memory-management patches

The memory-management subsystem remains one of the most complex parts ofthe kernel, with an ongoing reliance on various heuristics forperformance. It is thus not surprising that developers continue to try toimprove its functionality. A number of memory-management patches arecurrently in circulation; read on for a look at the freeing of page-tablepages, kvmalloc() flags, memory clearing, and NUMA "home nodes".