From: Matthew Wilcox <willy@xxxxxxxxxxxxxxx> We have customer demand to use 1GB pages to map DAX files. Unlike the 2MB page support, the Linux MM does not currently support PUD pages, so I have attempted to add support for the necessary pieces for DAX huge PUD pages. Filesystem support is a bit sticky. I have not been able to persuade ext4 to give me more than 16MB of contiguous space, although it is aligned. XFS will give me 80MB short of 1GB, but it's not aligned. I'm in no hurry to get patches 7 & 8 merged until the block allocation problem is solved in those filesystems. This patch set is against something approximately current -mm. At this point, I would be most grateful for MM developers to give feedback on the first three patches. Review from X86 maintainers on patch 4 would also be welcome. I'd like to thank Ross Zwisler for his helpful review during development. I've done some light testing using a program to mmap a block device with DAX enabled, calling mincore() and examining /proc/smaps and /proc/pagemap. Matthew Wilcox (8): mm: Add optional support for PUD-sized transparent hugepages mincore: Add support for PUDs procfs: Add support for PUDs to smaps, clear_refs and pagemap x86: Add support for PUD-sized transparent hugepages dax: Support for transparent PUD pages block_dev: Support PUD DAX mappings xfs: Support for transparent PUD pages ext4: Transparent support for PUD-sized transparent huge pages arch/Kconfig | 3 + arch/x86/Kconfig | 1 + arch/x86/include/asm/paravirt.h | 11 ++ arch/x86/include/asm/paravirt_types.h | 2 + arch/x86/include/asm/pgtable.h | 95 ++++++++++++++ arch/x86/include/asm/pgtable_64.h | 13 ++ arch/x86/kernel/paravirt.c | 1 + arch/x86/mm/pgtable.c | 31 +++++ fs/block_dev.c | 7 + fs/dax.c | 239 +++++++++++++++++++++++++++++++--- fs/ext4/file.c | 37 ++++++ fs/proc/task_mmu.c | 109 ++++++++++++++++ fs/xfs/xfs_file.c | 33 +++++ fs/xfs/xfs_trace.h | 1 + include/asm-generic/pgtable.h | 62 ++++++++- include/asm-generic/tlb.h | 14 ++ include/linux/dax.h | 21 +++ include/linux/huge_mm.h | 52 +++++++- include/linux/mm.h | 30 +++++ include/linux/mmu_notifier.h | 13 ++ mm/huge_memory.c | 151 +++++++++++++++++++++ mm/memory.c | 67 ++++++++++ mm/mincore.c | 13 ++ mm/pagewalk.c | 19 ++- mm/pgtable-generic.c | 14 ++ 25 files changed, 1016 insertions(+), 23 deletions(-) -- 2.6.2 -- 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>