On 06/04/2015 02:54 PM, Xishi Qiu wrote: > 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 If the mirrored memory is in a single reasonably compact (no large holes) range (per NUMA node) and won't dynamically change its size, then zone might be a better option. For one thing, it will still allow distinguishing movable and unmovable allocations within the mirrored memory. We had enough fun with MIGRATE_CMA and all kinds of checks it added to allocator hot paths, and even CMA is now considering moving to a separate zone. > 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(-) > -- 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>