Following the series pushed by Davidlohr Bueso based on the Jan Kara's work [1] which introduces range locks, this series implements the first step of the attempt to replace the mmap_sem by a range lock. While this series simply replaces the mmap_sem by a full range lock, the final goal is to introduce finer grain locking to allow better multi-thread performance in regards to the process's memory layout changes. This series is currently supports x86 and PowerPc architectures only. Some drivers are also impacted to allow build and basic test on few platforms but a lot of additional works is required to complete the job for all the supported architectures. The goal of this series is to check that no major performance hit happens for mono threaded process, as we could hope major improvements in the multi-threaded case once the finer grain locking is implemented. I didn't do massive performance checking yet, but building a full kernel on a 80 threaded Power node, doesn't show performance hits. The build time is 11m56.701s on a vanilla kernel and 12m4.679s when range lock is used. The next steps will attempt to implement finer grain locking but specific locking would certainly be required to protect mm data like the VMA cache. This series applies on top of 4.11-rc7. The first patch introduce a new parameter to some memory service which need to release the lock, since range lock require the range to specify, caller has to know about it. The second patch is removing some assert which were based on lock service which are not provided by the range lock API. While some of these checks will not be valid with range locks, some may be reviewed. The third patch is replacing nest locking operation on mmap_sem to simple locking operation has the nest lock check is not yet provided by the range lock API. The latest patch is doing the job of replacing the mmap_sem by a range lock. [1] "locking: Introduce range reader/writer lock" http://www.mail-archive.com/linux-kernel@xxxxxxxxxxxxxxx/msg1371431.html Laurent Dufour (4): Add additional range parameter to GUP() and handle_page_fault() Deactivate mmap_sem assert Remove nest locking operation with mmap_sem Change mmap_sem to range lock arch/powerpc/kernel/vdso.c | 8 ++- arch/powerpc/kvm/book3s_64_mmu_hv.c | 6 +- arch/powerpc/kvm/book3s_64_mmu_radix.c | 6 +- arch/powerpc/kvm/book3s_64_vio.c | 6 +- arch/powerpc/kvm/book3s_hv.c | 8 ++- arch/powerpc/kvm/e500_mmu_host.c | 7 ++- arch/powerpc/mm/copro_fault.c | 8 ++- arch/powerpc/mm/fault.c | 12 ++-- arch/powerpc/mm/mmu_context_iommu.c | 6 +- arch/powerpc/mm/subpage-prot.c | 16 ++++-- arch/powerpc/oprofile/cell/spu_task_sync.c | 8 ++- arch/powerpc/platforms/cell/spufs/file.c | 4 +- arch/x86/entry/vdso/vma.c | 14 +++-- arch/x86/events/core.c | 1 - arch/x86/kernel/tboot.c | 2 +- arch/x86/kernel/vm86_32.c | 6 +- arch/x86/mm/fault.c | 39 +++++++------ arch/x86/mm/mpx.c | 20 ++++--- drivers/android/binder.c | 8 ++- drivers/firmware/efi/arm-runtime.c | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 9 ++- drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 8 ++- drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 8 ++- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +- drivers/gpu/drm/amd/amdkfd/kfd_events.c | 6 +- drivers/gpu/drm/amd/amdkfd/kfd_process.c | 6 +- drivers/gpu/drm/etnaviv/etnaviv_gem.c | 9 ++- drivers/gpu/drm/i915/i915_gem.c | 6 +- drivers/gpu/drm/i915/i915_gem_userptr.c | 14 +++-- drivers/gpu/drm/radeon/radeon_cs.c | 9 ++- drivers/gpu/drm/radeon/radeon_gem.c | 8 ++- drivers/gpu/drm/radeon/radeon_mn.c | 8 ++- drivers/gpu/drm/radeon/radeon_ttm.c | 2 +- drivers/gpu/drm/ttm/ttm_bo_vm.c | 6 +- drivers/gpu/drm/via/via_dmablit.c | 6 +- drivers/infiniband/core/umem.c | 22 +++++--- drivers/infiniband/core/umem_odp.c | 8 ++- drivers/infiniband/hw/hfi1/user_pages.c | 18 ++++-- drivers/infiniband/hw/mlx4/main.c | 6 +- drivers/infiniband/hw/mlx5/main.c | 6 +- drivers/infiniband/hw/mthca/mthca_memfree.c | 3 +- drivers/infiniband/hw/qib/qib_user_pages.c | 18 ++++-- drivers/infiniband/hw/usnic/usnic_uiom.c | 22 +++++--- drivers/iommu/amd_iommu_v2.c | 8 ++- drivers/iommu/intel-svm.c | 8 ++- drivers/media/v4l2-core/videobuf-core.c | 9 ++- drivers/media/v4l2-core/videobuf-dma-contig.c | 6 +- drivers/media/v4l2-core/videobuf-dma-sg.c | 8 ++- drivers/misc/cxl/fault.c | 6 +- drivers/misc/mic/scif/scif_rma.c | 19 ++++--- drivers/oprofile/buffer_sync.c | 14 +++-- drivers/staging/lustre/lustre/llite/llite_mmap.c | 4 +- drivers/staging/lustre/lustre/llite/vvp_io.c | 6 +- .../interface/vchiq_arm/vchiq_2835_arm.c | 7 ++- .../vc04_services/interface/vchiq_arm/vchiq_arm.c | 6 +- drivers/vfio/vfio_iommu_spapr_tce.c | 13 +++-- drivers/vfio/vfio_iommu_type1.c | 24 +++++--- drivers/virt/fsl_hypervisor.c | 6 +- drivers/xen/gntdev.c | 6 +- drivers/xen/privcmd.c | 14 +++-- fs/aio.c | 7 ++- fs/coredump.c | 6 +- fs/exec.c | 26 ++++++--- fs/proc/base.c | 38 ++++++++----- fs/proc/internal.h | 1 + fs/proc/task_mmu.c | 30 ++++++---- fs/proc/task_nommu.c | 27 +++++---- fs/userfaultfd.c | 33 +++++------ include/linux/huge_mm.h | 2 - include/linux/hugetlb.h | 4 +- include/linux/mm.h | 21 ++++--- include/linux/mm_types.h | 3 +- include/linux/pagemap.h | 8 ++- include/linux/userfaultfd_k.h | 6 +- ipc/shm.c | 13 +++-- kernel/acct.c | 6 +- kernel/events/core.c | 6 +- kernel/events/uprobes.c | 28 ++++++---- kernel/exit.c | 10 ++-- kernel/fork.c | 21 ++++--- kernel/futex.c | 8 ++- kernel/sched/fair.c | 7 ++- kernel/sys.c | 31 ++++++++--- kernel/trace/trace_output.c | 6 +- mm/filemap.c | 9 +-- mm/frame_vector.c | 9 ++- mm/gup.c | 65 ++++++++++++---------- mm/hugetlb.c | 3 +- mm/init-mm.c | 2 +- mm/internal.h | 3 +- mm/khugepaged.c | 59 ++++++++++++-------- mm/ksm.c | 48 ++++++++++------ mm/madvise.c | 38 +++++++------ mm/memcontrol.c | 14 +++-- mm/memory.c | 43 +++++++------- mm/mempolicy.c | 32 +++++++---- mm/migrate.c | 12 ++-- mm/mincore.c | 6 +- mm/mlock.c | 25 ++++++--- mm/mmap.c | 51 +++++++++++------ mm/mmu_notifier.c | 6 +- mm/mprotect.c | 21 ++++--- mm/mremap.c | 6 +- mm/msync.c | 10 ++-- mm/nommu.c | 31 +++++++---- mm/oom_kill.c | 9 ++- mm/pagewalk.c | 3 - mm/process_vm_access.c | 9 ++- mm/shmem.c | 3 +- mm/swapfile.c | 8 ++- mm/userfaultfd.c | 25 +++++---- mm/util.c | 15 +++-- security/tomoyo/domain.c | 2 +- virt/kvm/async_pf.c | 8 ++- virt/kvm/kvm_main.c | 31 +++++++---- 115 files changed, 960 insertions(+), 555 deletions(-) -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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