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. Filesystems still need work to allocate 1GB pages. With ext4, I can only get 16MB of contiguous space, although it is aligned. With XFS, I can get 80MB less than 1GB, and it's not aligned. The XFS problem may be due to the small amount of RAM in my test machine. This patch set is against something approximately current -mm. I'd like to thank Dave Chinner & Kirill Shutemov for their reviews of v1. The conversion of pmd_fault & pud_fault to huge_fault is thanks to Dave's poking, and Kirill spotted a couple of problems in the MM code. Version 2 of the patch set is about 200 lines smaller (1016 insertions, 23 deletions in v1). 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: Convert an open-coded VM_BUG_ON_VMA mm,fs,dax: Change ->pmd_fault to ->huge_fault 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 ext4: Support for PUD-sized transparent huge pages Documentation/filesystems/dax.txt | 12 +- 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 | 10 +- fs/dax.c | 316 +++++++++++++++++++++++++--------- fs/ext2/file.c | 27 +-- fs/ext4/file.c | 60 +++---- fs/proc/task_mmu.c | 109 ++++++++++++ fs/xfs/xfs_file.c | 25 ++- fs/xfs/xfs_trace.h | 2 +- include/asm-generic/pgtable.h | 62 ++++++- include/asm-generic/tlb.h | 14 ++ include/linux/dax.h | 17 -- include/linux/huge_mm.h | 52 +++++- include/linux/mm.h | 50 +++++- include/linux/mmu_notifier.h | 13 ++ mm/huge_memory.c | 151 ++++++++++++++++ mm/memory.c | 101 +++++++++-- mm/mincore.c | 13 ++ mm/pagewalk.c | 19 +- mm/pgtable-generic.c | 14 ++ 27 files changed, 1008 insertions(+), 216 deletions(-) -- 2.6.4 -- 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>