]>
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 |