arch/arm64/mm/finegrained_thp.c

   1 #include <linux/shmem_fs.h>
   2 #include <asm/huge_mm.h>
   3
   4 bool arm64_hugepage_vma_shmem_check(struct vm_area_struct *vma,
   5                                         unsigned long vm_flags, int nr_pages)
   6 {
   7         /* Enabled via shmem mount options or sysfs settings. */
   8         if (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) {
   9                 return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
  10                                 nr_pages);
  11         }
  12         return false;
  13 }
  14
  15 bool arm64_hugepage_vma_file_check(struct vm_area_struct *vma,
  16                                         unsigned long vm_flags, int nr_pages)
  17 {
  18         /* Read-only file mappings need to be aligned for THP to work. */
  19         if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && vma->vm_file &&
  20             (vm_flags & VM_DENYWRITE) && !(vm_flags & VM_WRITE)) {
  21                 return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
  22                                 nr_pages);
  23         }
  24         return false;
  25 }
  26