git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| f8af4da3 HD |
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 |