Changes since v1: [1] 1/ Rebase on latest -next (20151209). Fixed up PHYSICAL_PAGE_MASK, but no other major collisions. 2/ Decreased the transfer size in "dax: increase granularity of dax_clear_blocks() operations" to get the max latency to reschedule under 1ms and average latency under 150us. (Andrew) 3/ Add cc's for x86 maintainers 4/ Add Tested-by: Logan Gunthorpe This update, as before, passes the ndctl [2] and nvml [3] test suites. [1]: https://lists.01.org/pipermail/linux-nvdimm/2015-December/003213.html [2]: https://github.com/pmem/ndctl [3]: https://github.com/pmem/nvml A git tree of this set is available here: git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm libnvdimm-pending --- Summary: To date, we have implemented two I/O usage models for persistent memory, PMEM (a persistent "ram disk") and DAX (mmap persistent memory into userspace). This series adds a third, DAX-GUP, that allows DAX mappings to be the target of direct-i/o. It allows userspace to coordinate DMA/RDMA from/to persistent memory. The implementation leverages the ZONE_DEVICE mm-zone that went into 4.3-rc1 (also discussed at kernel summit) to flag pages that are owned and dynamically mapped by a device driver. The pmem driver, after mapping a persistent memory range into the system memmap via devm_memremap_pages(), arranges for DAX to distinguish pfn-only versus page-backed pmem-pfns via flags in the new pfn_t type. The DAX code, upon seeing a PFN_DEV+PFN_MAP flagged pfn, flags the resulting pte(s) inserted into the process page tables with a new _PAGE_DEVMAP flag. Later, when get_user_pages() is walking ptes it keys off _PAGE_DEVMAP to pin the device hosting the page range active. Finally, get_page() and put_page() are modified to take references against the device driver established page mapping. Finally, this need for "struct page" for persistent memory requires memory capacity to store the memmap array. Given the memmap array for a large pool of persistent may exhaust available DRAM introduce a mechanism to allocate the memmap from persistent memory. The new "struct vmem_altmap *" parameter to devm_memremap_pages() enables arch_add_memory() to use reserved pmem capacity rather than the page allocator. --- Dan Williams (23): pmem, dax: clean up clear_pmem() dax: increase granularity of dax_clear_blocks() operations dax: guarantee page aligned results from bdev_direct_access() dax: fix lifetime of in-kernel dax mappings with dax_map_atomic() um: kill pfn_t kvm: rename pfn_t to kvm_pfn_t mm, dax, pmem: introduce pfn_t mm: introduce find_dev_pagemap() x86, mm: introduce vmem_altmap to augment vmemmap_populate() libnvdimm, pfn, pmem: allocate memmap array in persistent memory avr32: convert to asm-generic/memory_model.h hugetlb: fix compile error on tile frv: fix compiler warning from definition of __pmd() x86, mm: introduce _PAGE_DEVMAP mm, dax, gpu: convert vm_insert_mixed to pfn_t mm, dax: convert vmf_insert_pfn_pmd() to pfn_t list: introduce list_del_poison() libnvdimm, pmem: move request_queue allocation earlier in probe mm, dax, pmem: introduce {get|put}_dev_pagemap() for dax-gup mm, dax: dax-pmd vs thp-pmd vs hugetlbfs-pmd mm, x86: get_user_pages() for dax mappings dax: provide diagnostics for pmd mapping failures dax: re-enable dax pmd mappings Ross Zwisler (1): mm, dax: fix livelock, allow dax pmd mappings to become writeable Toshi Kani (1): dax: Split pmd map when fallback on COW arch/alpha/include/asm/pgtable.h | 1 arch/arm/include/asm/kvm_mmu.h | 5 - arch/arm/kvm/mmu.c | 10 + arch/arm64/include/asm/kvm_mmu.h | 3 arch/avr32/include/asm/page.h | 8 - arch/frv/include/asm/page.h | 2 arch/ia64/include/asm/page.h | 1 arch/ia64/include/asm/pgtable.h | 1 arch/m68k/include/asm/page_mm.h | 1 arch/m68k/include/asm/page_no.h | 1 arch/mips/include/asm/kvm_host.h | 6 - arch/mips/kvm/emulate.c | 2 arch/mips/kvm/tlb.c | 14 + arch/mn10300/include/asm/page.h | 1 arch/parisc/include/asm/pgtable.h | 1 arch/powerpc/include/asm/kvm_book3s.h | 4 arch/powerpc/include/asm/kvm_ppc.h | 2 arch/powerpc/include/asm/pgtable.h | 1 arch/powerpc/kvm/book3s.c | 6 - arch/powerpc/kvm/book3s_32_mmu_host.c | 2 arch/powerpc/kvm/book3s_64_mmu_host.c | 2 arch/powerpc/kvm/e500.h | 2 arch/powerpc/kvm/e500_mmu_host.c | 8 - arch/powerpc/kvm/trace_pr.h | 2 arch/powerpc/sysdev/axonram.c | 8 - arch/sh/include/asm/pgtable-3level.h | 1 arch/sparc/include/asm/pgtable_64.h | 2 arch/tile/include/asm/pgtable.h | 1 arch/um/include/asm/page.h | 7 - arch/um/include/asm/pgtable-3level.h | 5 - arch/um/include/asm/pgtable.h | 2 arch/x86/include/asm/pgtable.h | 26 +++ arch/x86/include/asm/pgtable_types.h | 7 + arch/x86/include/asm/pmem.h | 7 - arch/x86/kvm/iommu.c | 11 + arch/x86/kvm/mmu.c | 37 ++-- arch/x86/kvm/mmu_audit.c | 2 arch/x86/kvm/paging_tmpl.h | 6 - arch/x86/kvm/vmx.c | 2 arch/x86/kvm/x86.c | 2 arch/x86/mm/gup.c | 56 +++++- arch/x86/mm/init_64.c | 32 +++ arch/x86/mm/pat.c | 4 drivers/block/brd.c | 4 drivers/gpu/drm/exynos/exynos_drm_gem.c | 3 drivers/gpu/drm/gma500/framebuffer.c | 3 drivers/gpu/drm/msm/msm_gem.c | 3 drivers/gpu/drm/omapdrm/omap_gem.c | 6 - drivers/gpu/drm/ttm/ttm_bo_vm.c | 3 drivers/nvdimm/pfn_devs.c | 3 drivers/nvdimm/pmem.c | 70 +++++-- drivers/s390/block/dcssblk.c | 10 - fs/Kconfig | 3 fs/block_dev.c | 15 +- fs/dax.c | 290 +++++++++++++++++++---------- include/asm-generic/pgtable.h | 10 + include/linux/blkdev.h | 19 ++ include/linux/huge_mm.h | 15 +- include/linux/hugetlb.h | 1 include/linux/io.h | 15 -- include/linux/kvm_host.h | 37 ++-- include/linux/kvm_types.h | 2 include/linux/list.h | 17 ++ include/linux/memory_hotplug.h | 3 include/linux/mm.h | 310 ++++++++++++++++++++++++++++++- include/linux/mm_types.h | 5 + include/linux/pfn.h | 9 + kernel/memremap.c | 188 ++++++++++++++++++- lib/list_debug.c | 4 mm/gup.c | 18 ++ mm/huge_memory.c | 131 +++++++++---- mm/memory.c | 25 +-- mm/memory_hotplug.c | 66 +++++-- mm/mprotect.c | 5 - mm/page_alloc.c | 10 + mm/pgtable-generic.c | 2 mm/sparse-vmemmap.c | 37 ++++ mm/sparse.c | 8 + mm/swap.c | 15 ++ virt/kvm/kvm_main.c | 47 ++--- 80 files changed, 1300 insertions(+), 416 deletions(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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