From: Jérôme Glisse <[email protected]> Changes since v2: - fix build warning with CONFIG_MMU_NOTIFIER=n - fix make htmldocs warning
Changes since v1: - fix build with CONFIG_MMU_NOTIFIER=n - kernel docs Original cover letter: This patchset add contextual information, why an invalidation is happening, to mmu notifier callback. This is necessary for user of mmu notifier that wish to maintains their own data structure without having to add new fields to struct vm_area_struct (vma). For instance device can have they own page table that mirror the process address space. When a vma is unmap (munmap() syscall) the device driver can free the device page table for the range. Today we do not have any information on why a mmu notifier call back is happening and thus device driver have to assume that it is always an munmap(). This is inefficient at it means that it needs to re-allocate device page table on next page fault and rebuild the whole device driver data structure for the range. Other use case beside munmap() also exist, for instance it is pointless for device driver to invalidate the device page table when the invalidation is for the soft dirtyness tracking. Or device driver can optimize away mprotect() that change the page table permission access for the range. This patchset enable all this optimizations for device driver. I do not include any of those in this serie but other patchset i am posting will leverage this. >From code point of view the patchset is pretty simple, the first two patches consolidate all mmu notifier arguments into a struct so that it is easier to add/change arguments. The last patch adds the contextual information (munmap, protection, soft dirty, clear, ...). Cheers, Jérôme Cc: Christian König <[email protected]> Cc: Jan Kara <[email protected]> Cc: Felix Kuehling <[email protected]> Cc: Jason Gunthorpe <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Ross Zwisler <[email protected]> Cc: Dan Williams <[email protected]> Cc: Paolo Bonzini <[email protected]> Cc: Radim Krčmář <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Christian Koenig <[email protected]> Cc: Ralph Campbell <[email protected]> Cc: John Hubbard <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: Arnd Bergmann <[email protected]> Jérôme Glisse (3): mm/mmu_notifier: use structure for invalidate_range_start/end callback v2 mm/mmu_notifier: use structure for invalidate_range_start/end calls v3 mm/mmu_notifier: contextual information for event triggering invalidation v2 drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 47 ++++----- drivers/gpu/drm/i915/i915_gem_userptr.c | 14 ++- drivers/gpu/drm/radeon/radeon_mn.c | 16 ++- drivers/infiniband/core/umem_odp.c | 20 ++-- drivers/infiniband/hw/hfi1/mmu_rb.c | 13 +-- drivers/misc/mic/scif/scif_dma.c | 11 +- drivers/misc/sgi-gru/grutlbpurge.c | 14 ++- drivers/xen/gntdev.c | 12 +-- fs/dax.c | 15 ++- fs/proc/task_mmu.c | 8 +- include/linux/mm.h | 4 +- include/linux/mmu_notifier.h | 132 ++++++++++++++++++------ kernel/events/uprobes.c | 11 +- mm/hmm.c | 23 ++--- mm/huge_memory.c | 58 +++++------ mm/hugetlb.c | 54 +++++----- mm/khugepaged.c | 11 +- mm/ksm.c | 23 ++--- mm/madvise.c | 22 ++-- mm/memory.c | 103 +++++++++--------- mm/migrate.c | 29 +++--- mm/mmu_notifier.c | 22 ++-- mm/mprotect.c | 16 +-- mm/mremap.c | 11 +- mm/oom_kill.c | 17 +-- mm/rmap.c | 32 +++--- virt/kvm/kvm_main.c | 14 +-- 27 files changed, 406 insertions(+), 346 deletions(-) -- 2.17.2
