The V4 version of MBM is almost a complete rewrite of the prior versions. It tries to address all of Thomas earlier comments.
The patch series has one preparatory patch for cqm and then 4 MBM patches. *Patches apply on 4.5-rc1*. Memory bandwitdh monitoring(MBM) provides OS/VMM a way to monitor bandwidth from one level of cache to another. The current patches support L3 external bandwitch monitoring. It supports both 'local bandwidth' and 'total bandwidth' monitoring for the socket. Local bandwidth measures the amount of data sent through the memory controller on the socket and total b/w measures the total system bandwidth. The tasks are associated with a Resouce Monitoring ID(RMID) just like in cqm and OS uses a MSR write to indicate the RMID of the task during scheduling. [PATCH 1/5] x86,perf/cqm : Fix cqm handling of grouping events into a [PATCH 2/5] x86/mbm: Intel Memory B/W Monitoring enumeration and init [PATCH 3/5] x86/mbm: Memory bandwidth monitoring event management [PATCH 4/5] x86/mbm: RMID Recycling MBM changes [PATCH 5/5] x86/mbm: Add support for MBM counter overflow handling
