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 can support the feature after boot time. It introduces mirror_info to save the mirrored memory range. Then use __GFP_MIRROR to allocate mirrored pages. I think add a new migratetype is btter and easier than a new zone, so I use MIGRATE_MIRROR to manage the mirrored pages. However it changed some code in the core file, please review and comment, thanks. TBD: 1) call add_mirror_info() to fill mirrored memory info. 2) add compatibility with memory online/offline. 3) add more interface? others? Xishi Qiu (12): mm: add a new config to manage the code mm: introduce mirror_info mm: introduce MIGRATE_MIRROR to manage the mirrored pages mm: add mirrored pages to buddy system mm: introduce a new zone_stat_item NR_FREE_MIRROR_PAGES mm: add free mirrored pages info mm: introduce __GFP_MIRROR to allocate mirrored pages mm: use mirrorable to switch allocate mirrored memory mm: enable allocate mirrored memory at boot time mm: add the buddy system interface mm: add the PCP interface mm: let slab/slub/slob use mirrored memory arch/x86/mm/numa.c | 3 ++ drivers/base/node.c | 17 ++++--- fs/proc/meminfo.c | 6 +++ include/linux/gfp.h | 5 +- include/linux/mmzone.h | 23 +++++++++ include/linux/vmstat.h | 2 + kernel/sysctl.c | 9 ++++ mm/Kconfig | 8 +++ mm/page_alloc.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++--- mm/slab.c | 3 +- mm/slob.c | 2 +- mm/slub.c | 2 +- mm/vmstat.c | 4 ++ 13 files changed, 202 insertions(+), 16 deletions(-) -- 2.0.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
