From: Jérôme Glisse jglisse@redhat.com
CPU page table update can happens for many reasons, not only as a result of a syscall (munmap(), mprotect(), mremap(), madvise(), ...) but also as a result of kernel activities (memory compression, reclaim, migration, ...).
Users of mmu notifier API track changes to the CPU page table and take specific action for them. While current API only provide range of virtual address affected by the change, not why the changes is happening
This patch is just passing down the new informations by adding it to the mmu_notifier_range structure.
Changes since v1: - Initialize flags field from mmu_notifier_range_init() arguments
Signed-off-by: Jérôme Glisse jglisse@redhat.com Cc: Christian König christian.koenig@amd.com Cc: Joonas Lahtinen joonas.lahtinen@linux.intel.com Cc: Jani Nikula jani.nikula@linux.intel.com Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: Jan Kara jack@suse.cz Cc: Andrea Arcangeli aarcange@redhat.com Cc: Peter Xu peterx@redhat.com Cc: Felix Kuehling Felix.Kuehling@amd.com Cc: Jason Gunthorpe jgg@mellanox.com Cc: Ross Zwisler zwisler@kernel.org Cc: Dan Williams dan.j.williams@intel.com Cc: Paolo Bonzini pbonzini@redhat.com Cc: Radim Krčmář rkrcmar@redhat.com Cc: Michal Hocko mhocko@kernel.org Cc: Christian Koenig christian.koenig@amd.com Cc: Ralph Campbell rcampbell@nvidia.com Cc: John Hubbard jhubbard@nvidia.com Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: Arnd Bergmann arnd@arndb.de --- include/linux/mmu_notifier.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 62f94cd85455..0379956fff23 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -58,10 +58,12 @@ struct mmu_notifier_mm { #define MMU_NOTIFIER_RANGE_BLOCKABLE (1 << 0)
struct mmu_notifier_range { + struct vm_area_struct *vma; struct mm_struct *mm; unsigned long start; unsigned long end; unsigned flags; + enum mmu_notifier_event event; };
struct mmu_notifier_ops { @@ -363,10 +365,12 @@ static inline void mmu_notifier_range_init(struct mmu_notifier_range *range, unsigned long start, unsigned long end) { + range->vma = vma; + range->event = event; range->mm = mm; range->start = start; range->end = end; - range->flags = 0; + range->flags = flags; }
#define ptep_clear_flush_young_notify(__vma, __address, __ptep) \