| #ifndef __LINUX_KSM_H |
| #define __LINUX_KSM_H |
| /* |
| * Memory merging support. |
| * |
| * This code enables dynamic sharing of identical pages found in different |
| * memory areas, even if they are not shared by fork(). |
| */ |
| |
| #include <linux/bitops.h> |
| #include <linux/mm.h> |
| #include <linux/sched.h> |
| |
| #ifdef CONFIG_KSM |
| int ksm_madvise(struct vm_area_struct *vma, unsigned long start, |
| unsigned long end, int advice, unsigned long *vm_flags); |
| int __ksm_enter(struct mm_struct *mm); |
| void __ksm_exit(struct mm_struct *mm); |
| |
| static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) |
| { |
| if (test_bit(MMF_VM_MERGEABLE, &oldmm->flags)) |
| return __ksm_enter(mm); |
| return 0; |
| } |
| |
| static inline void ksm_exit(struct mm_struct *mm) |
| { |
| if (test_bit(MMF_VM_MERGEABLE, &mm->flags)) |
| __ksm_exit(mm); |
| } |
| #else /* !CONFIG_KSM */ |
| |
| static inline int ksm_madvise(struct vm_area_struct *vma, unsigned long start, |
| unsigned long end, int advice, unsigned long *vm_flags) |
| { |
| return 0; |
| } |
| |
| static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) |
| { |
| return 0; |
| } |
| |
| static inline void ksm_exit(struct mm_struct *mm) |
| { |
| } |
| #endif /* !CONFIG_KSM */ |
| |
| #endif |