[RFC v2 PATCH 0/8] mm: mirrored memory support for page buddy allocations

[Xishi Qiu]

Intel Xeon processor E7 v3 product family-based platforms introduces support
for partial memory mirroring called as 'Address Range Mirroring'. This feature
allows BIOS to specify a subset of total available memory to be mirrored (and
optionally also specify whether to mirror the range 0-4 GB). This capability
allows user to make an appropriate tradeoff between non-mirrored memory range
and mirrored memory range thus optimizing total available memory and still
achieving highly reliable memory range for mission critical workloads and/or
kernel space.

Tony has already send a patchset to supprot this feature at boot time.
https://lkml.org/lkml/2015/5/8/521
This patchset is based on Tony's, it can support the feature after boot time.
Use mirrored memory for all kernel allocations.

TBD: 
  - Add compatibility with memory online/offline, memory compaction, CMA...
  - Need to discuss the implementation ideas, add a new zone or a new
    migratetype or others.

V2:
  - Use memblock which marked MEMBLOCK_MIRROR to find mirrored memory instead
    of mirror_info.
  - Remove __GFP_MIRROR and /proc/sys/vm/mirrorable.
  - Use mirrored memory for all kernel allocations.


Xishi Qiu (8):
  mm: add a new config to manage the code
  mm: introduce MIGRATE_MIRROR to manage the mirrored pages
  mm: find mirrored memory in memblock
  mm: add mirrored memory to buddy system
  mm: introduce a new zone_stat_item NR_FREE_MIRROR_PAGES
  mm: add free mirrored pages info
  mm: add the buddy system interface
  mm: add the PCP interface

 drivers/base/node.c      |  17 ++++---
 fs/proc/meminfo.c        |   6 +++
 include/linux/memblock.h |  29 ++++++++++--
 include/linux/mmzone.h   |  10 ++++
 include/linux/vmstat.h   |   2 +
 mm/Kconfig               |   8 ++++
 mm/memblock.c            |  33 +++++++++++--
 mm/nobootmem.c           |   3 ++
 mm/page_alloc.c          | 117 ++++++++++++++++++++++++++++++++++++-----------
 mm/vmstat.c              |   4 ++
 10 files changed, 190 insertions(+), 39 deletions(-)

-- 
2.0.0


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