Am 03.12.18 um 21:18 schrieb jglisse@xxxxxxxxxx: > From: Jérôme Glisse <jglisse@xxxxxxxxxx> > > 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, > ...). Skimming over it at least the parts I'm familiar with look completely sane to me. Whole series is Acked-by: Christian König <christian.koenig@xxxxxxx>. Regards, Christian. > > Cheers, > Jérôme > > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> > Cc: Ross Zwisler <zwisler@xxxxxxxxxx> > Cc: Jan Kara <jack@xxxxxxx> > Cc: Dan Williams <dan.j.williams@xxxxxxxxx> > Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> > Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx> > Cc: Michal Hocko <mhocko@xxxxxxxxxx> > Cc: Christian Koenig <christian.koenig@xxxxxxx> > Cc: Felix Kuehling <felix.kuehling@xxxxxxx> > Cc: Ralph Campbell <rcampbell@xxxxxxxxxx> > Cc: John Hubbard <jhubbard@xxxxxxxxxx> > Cc: kvm@xxxxxxxxxxxxxxx > Cc: linux-rdma@xxxxxxxxxxxxxxx > Cc: linux-fsdevel@xxxxxxxxxxxxxxx > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx > > Jérôme Glisse (3): > mm/mmu_notifier: use structure for invalidate_range_start/end callback > mm/mmu_notifier: use structure for invalidate_range_start/end calls > mm/mmu_notifier: contextual information for event triggering > invalidation > > drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 43 ++++----- > 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 | 11 ++- > fs/proc/task_mmu.c | 10 ++- > include/linux/mm.h | 4 +- > include/linux/mmu_notifier.h | 106 +++++++++++++++------- > kernel/events/uprobes.c | 13 +-- > mm/hmm.c | 23 ++--- > mm/huge_memory.c | 58 ++++++------ > mm/hugetlb.c | 63 +++++++------ > mm/khugepaged.c | 13 +-- > mm/ksm.c | 26 +++--- > mm/madvise.c | 22 ++--- > mm/memory.c | 112 ++++++++++++++---------- > mm/migrate.c | 30 ++++--- > mm/mmu_notifier.c | 22 +++-- > mm/mprotect.c | 17 ++-- > mm/mremap.c | 14 +-- > mm/oom_kill.c | 20 +++-- > mm/rmap.c | 34 ++++--- > virt/kvm/kvm_main.c | 14 ++- > 27 files changed, 421 insertions(+), 334 deletions(-) >
