Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
[cris-mirror.git] / include / linux / khugepaged.h
blob6b394f0b51485076b28ed9fc2136d854b5d1c677
1 #ifndef _LINUX_KHUGEPAGED_H
2 #define _LINUX_KHUGEPAGED_H
4 #include <linux/sched.h> /* MMF_VM_HUGEPAGE */
6 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
7 extern int __khugepaged_enter(struct mm_struct *mm);
8 extern void __khugepaged_exit(struct mm_struct *mm);
9 extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma);
11 #define khugepaged_enabled() \
12 (transparent_hugepage_flags & \
13 ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
14 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
15 #define khugepaged_always() \
16 (transparent_hugepage_flags & \
17 (1<<TRANSPARENT_HUGEPAGE_FLAG))
18 #define khugepaged_req_madv() \
19 (transparent_hugepage_flags & \
20 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
21 #define khugepaged_defrag() \
22 (transparent_hugepage_flags & \
23 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
25 static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
27 if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
28 return __khugepaged_enter(mm);
29 return 0;
32 static inline void khugepaged_exit(struct mm_struct *mm)
34 if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
35 __khugepaged_exit(mm);
38 static inline int khugepaged_enter(struct vm_area_struct *vma)
40 if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
41 if ((khugepaged_always() ||
42 (khugepaged_req_madv() &&
43 vma->vm_flags & VM_HUGEPAGE)) &&
44 !(vma->vm_flags & VM_NOHUGEPAGE))
45 if (__khugepaged_enter(vma->vm_mm))
46 return -ENOMEM;
47 return 0;
49 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
50 static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
52 return 0;
54 static inline void khugepaged_exit(struct mm_struct *mm)
57 static inline int khugepaged_enter(struct vm_area_struct *vma)
59 return 0;
61 static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma)
63 return 0;
65 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
67 #endif /* _LINUX_KHUGEPAGED_H */