๐ [$] NUMA rebalancing on tiered-memory systems
๐ก Newskategorie: Linux Tipps
๐ Quelle: lwn.net
The classic NUMA architecture is built around nodes, each of which contains a set of CPUs and some local memory; all nodes are more-or-less equal. Recently, though, "tiered-memory" NUMA systems have begun to appear; these include CPU-less nodes that contain persistent memory rather than (faster, but more expensive) DRAM. One possible use for that memory is to hold less-frequently-used pages rather than forcing them out to a backing-store device. There is an interesting problem that emerges from this use case, though: how does the kernel manage the movement of pages between faster and slower memory? Several recent patch sets have taken differing approaches to the problem of rebalancing memory on these systems. ...