I warned last month that I have been working on "huge tmpfs": an implementation of Transparent Huge Page Cache in tmpfs, for those who are tired of the limitations of hugetlbfs. Here's a fully working patchset, against v3.19 so that you can give it a try against a stable base. I've not yet studied how well it applies to current git: probably lots of easily resolved clashes with nonlinear removal. Against mmotm, the rmap.c differences looked nontrivial. Fully working? Well, at present page migration just keeps away from these teams of pages. And once memory pressure has disbanded a team to swap it out, there is nothing to put it together again later on, to restore the original hugepage performance. Those must follow, but no thought yet (khugepaged? maybe). Yes, I realize there's nothing yet under Documentation, nor fs/proc beyond meminfo, nor other debug/visibility files: must follow, but I've cared more to provide the basic functionality. I don't expect to update this patchset in the next few weeks: now that it's posted, my priority is look at other people's work before LSF/MM; and in particular, of course, your (Kirill's) THP refcounting redesign. 01 mm: update_lru_size warn and reset bad lru_size 02 mm: update_lru_size do the __mod_zone_page_state 03 mm: use __SetPageSwapBacked and don't ClearPageSwapBacked 04 mm: make page migration's newpage handling more robust 05 tmpfs: preliminary minor tidyups 06 huge tmpfs: prepare counts in meminfo, vmstat and SysRq-m 07 huge tmpfs: include shmem freeholes in available memory counts 08 huge tmpfs: prepare huge=N mount option and /proc/sys/vm/shmem_huge 09 huge tmpfs: try to allocate huge pages, split into a team 10 huge tmpfs: avoid team pages in a few places 11 huge tmpfs: shrinker to migrate and free underused holes 12 huge tmpfs: get_unmapped_area align and fault supply huge page 13 huge tmpfs: extend get_user_pages_fast to shmem pmd 14 huge tmpfs: extend vma_adjust_trans_huge to shmem pmd 15 huge tmpfs: rework page_referenced_one and try_to_unmap_one 16 huge tmpfs: fix problems from premature exposure of pagetable 17 huge tmpfs: map shmem by huge page pmd or by page team ptes 18 huge tmpfs: mmap_sem is unlocked when truncation splits huge pmd 19 huge tmpfs: disband split huge pmds on race or memory failure 20 huge tmpfs: use Unevictable lru with variable hpage_nr_pages() 21 huge tmpfs: fix Mlocked meminfo, tracking huge and unhuge mlocks 22 huge tmpfs: fix Mapped meminfo, tracking huge and unhuge mappings 23 kvm: plumb return of hva when resolving page fault. 24 kvm: teach kvm to map page teams as huge pages. arch/mips/mm/gup.c | 17 arch/powerpc/mm/pgtable_64.c | 7 arch/s390/mm/gup.c | 22 arch/sparc/mm/gup.c | 22 arch/x86/kvm/mmu.c | 171 +++- arch/x86/kvm/paging_tmpl.h | 6 arch/x86/mm/gup.c | 17 drivers/base/node.c | 20 drivers/char/mem.c | 23 fs/proc/meminfo.c | 17 include/linux/huge_mm.h | 18 include/linux/kvm_host.h | 2 include/linux/memcontrol.h | 11 include/linux/mempolicy.h | 6 include/linux/migrate.h | 3 include/linux/mm.h | 95 +- include/linux/mm_inline.h | 24 include/linux/mm_types.h | 1 include/linux/mmzone.h | 5 include/linux/page-flags.h | 6 include/linux/pageteam.h | 289 +++++++ include/linux/shmem_fs.h | 21 include/trace/events/migrate.h | 3 ipc/shm.c | 6 kernel/sysctl.c | 12 mm/balloon_compaction.c | 10 mm/compaction.c | 6 mm/filemap.c | 10 mm/gup.c | 22 mm/huge_memory.c | 281 ++++++- mm/internal.h | 25 mm/memcontrol.c | 42 - mm/memory-failure.c | 8 mm/memory.c | 227 +++-- mm/migrate.c | 139 +-- mm/mlock.c | 181 ++-- mm/mmap.c | 17 mm/page-writeback.c | 2 mm/page_alloc.c | 13 mm/rmap.c | 207 +++-- mm/shmem.c | 1235 +++++++++++++++++++++++++++++-- mm/swap.c | 5 mm/swap_state.c | 3 mm/truncate.c | 2 mm/vmscan.c | 76 + mm/vmstat.c | 3 mm/zswap.c | 3 virt/kvm/kvm_main.c | 24 48 files changed, 2790 insertions(+), 575 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>