struct page *huge_zero_page __read_mostly;
unsigned long huge_zero_pfn __read_mostly = ~0UL;
-bool transparent_hugepage_active(struct vm_area_struct *vma)
+bool hugepage_vma_check(struct vm_area_struct *vma,
+ unsigned long vm_flags,
+ bool smaps)
{
- /* The addr is used to check if the vma size fits */
- unsigned long addr = (vma->vm_end & HPAGE_PMD_MASK) - HPAGE_PMD_SIZE;
+ if (!vma->vm_mm) /* vdso */
+ return false;
+
+ if (!transhuge_vma_enabled(vma, vm_flags))
+ return false;
- if (!transhuge_vma_suitable(vma, addr))
+ if (vm_flags & VM_NO_KHUGEPAGED)
return false;
- if (vma_is_anonymous(vma))
- return __transparent_hugepage_enabled(vma);
- if (vma_is_shmem(vma))
+
+ /* Don't run khugepaged against DAX vma */
+ if (vma_is_dax(vma))
+ return false;
+
+ /* Check alignment for file vma and size for both file and anon vma */
+ if (!transhuge_vma_suitable(vma, (vma->vm_end - HPAGE_PMD_SIZE)))
+ return false;
+
+ /* Enabled via shmem mount options or sysfs settings. */
+ if (shmem_file(vma->vm_file))
return shmem_huge_enabled(vma);
- if (transhuge_vma_enabled(vma, vma->vm_flags) && file_thp_enabled(vma))
+
+ if (!khugepaged_enabled())
+ return false;
+
+ /* THP settings require madvise. */
+ if (!(vm_flags & VM_HUGEPAGE) && !khugepaged_always())
+ return false;
+
+ /* Only regular file is valid */
+ if (file_thp_enabled(vma))
return true;
- return false;
+ if (!vma_is_anonymous(vma))
+ return false;
+
+ if (vma_is_temporary_stack(vma))
+ return false;
+
+ /*
+ * THPeligible bit of smaps should show 1 for proper VMAs even
+ * though anon_vma is not initialized yet.
+ */
+ if (!vma->anon_vma)
+ return smaps;
+
+ return true;
}
static bool get_huge_zero_page(void)