| Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame^] | 1 | #ifndef __LINUX_KSM_H |
| 2 | #define __LINUX_KSM_H |
| 3 | /* |
| 4 | * Memory merging support. |
| 5 | * |
| 6 | * This code enables dynamic sharing of identical pages found in different |
| 7 | * memory areas, even if they are not shared by fork(). |
| 8 | */ |
| 9 | |
| 10 | #include <linux/bitops.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/sched.h> |
| 13 | |
| 14 | #ifdef CONFIG_KSM |
| 15 | int ksm_madvise(struct vm_area_struct *vma, unsigned long start, |
| 16 | unsigned long end, int advice, unsigned long *vm_flags); |
| 17 | int __ksm_enter(struct mm_struct *mm); |
| 18 | void __ksm_exit(struct mm_struct *mm); |
| 19 | |
| 20 | static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) |
| 21 | { |
| 22 | if (test_bit(MMF_VM_MERGEABLE, &oldmm->flags)) |
| 23 | return __ksm_enter(mm); |
| 24 | return 0; |
| 25 | } |
| 26 | |
| 27 | static inline void ksm_exit(struct mm_struct *mm) |
| 28 | { |
| 29 | if (test_bit(MMF_VM_MERGEABLE, &mm->flags)) |
| 30 | __ksm_exit(mm); |
| 31 | } |
| 32 | #else /* !CONFIG_KSM */ |
| 33 | |
| 34 | static inline int ksm_madvise(struct vm_area_struct *vma, unsigned long start, |
| 35 | unsigned long end, int advice, unsigned long *vm_flags) |
| 36 | { |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) |
| 41 | { |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | static inline void ksm_exit(struct mm_struct *mm) |
| 46 | { |
| 47 | } |
| 48 | #endif /* !CONFIG_KSM */ |
| 49 | |
| 50 | #endif |