[libvirt] [RFC PATCH 0/2] Introduce RDT memory bandwidth allocation support

[bing.niu at intel.com]

From: Bing Niu <bing.niu at intel.com>

This series is to introduce RDT memory bandwidth allocation support by extending
current virresctrl implementation.

The Memory Bandwidth Allocation (MBA) feature provides indirect and approximate
control over memory bandwidth available per-core. This feature provides a method to
control applications which may be over-utilizing bandwidth relative to their priority
in environments such as the data-center. The details can be found in Intel's SDM 17.19.7.
Kernel supports MBA through resctrl file system same as CAT. Each resctrl group have a
MB parameter to control how much memory bandwidth it can utilize in unit of percentage.

In this series, MBA is enabled by enhancing existing virresctrl implementation. The
policy employed for MBA is similar with CAT: The sum of each MBA group's bandwidth
dose not exceed 100%. The enhancement of virresctrl include two parts:

Patch 1: Add two new structure virResctrlInfoMB and virResctrlAllocMB for collecting
         host system MBA capability and domain memory bandwidth allocation.

Patch 2: On frontend XML parsing, add new element "llc" in cachetune section for
         MBA allocation.

Bing Niu (2):
  util: Add memory bandwidth support to resctrl
  conf: Extend cputune/cachetune to support memory bandwidth allocation

 src/conf/domain_conf.c |  86 +++++++++-
 src/util/virresctrl.c  | 422 ++++++++++++++++++++++++++++++++++++++++++++++---
 src/util/virresctrl.h  |   5 +
 3 files changed, 487 insertions(+), 26 deletions(-)

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2.7.4