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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
