diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/ksm.h')
-rw-r--r-- | ANDROID_3.4.5/include/linux/ksm.h | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/ANDROID_3.4.5/include/linux/ksm.h b/ANDROID_3.4.5/include/linux/ksm.h deleted file mode 100644 index 3319a696..00000000 --- a/ANDROID_3.4.5/include/linux/ksm.h +++ /dev/null @@ -1,145 +0,0 @@ -#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/pagemap.h> -#include <linux/rmap.h> -#include <linux/sched.h> - -struct stable_node; -struct mem_cgroup; - -struct page *ksm_does_need_to_copy(struct page *page, - struct vm_area_struct *vma, unsigned long address); - -#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); -} - -/* - * A KSM page is one of those write-protected "shared pages" or "merged pages" - * which KSM maps into multiple mms, wherever identical anonymous page content - * is found in VM_MERGEABLE vmas. It's a PageAnon page, pointing not to any - * anon_vma, but to that page's node of the stable tree. - */ -static inline int PageKsm(struct page *page) -{ - return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) == - (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM); -} - -static inline struct stable_node *page_stable_node(struct page *page) -{ - return PageKsm(page) ? page_rmapping(page) : NULL; -} - -static inline void set_page_stable_node(struct page *page, - struct stable_node *stable_node) -{ - page->mapping = (void *)stable_node + - (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM); -} - -/* - * When do_swap_page() first faults in from swap what used to be a KSM page, - * no problem, it will be assigned to this vma's anon_vma; but thereafter, - * it might be faulted into a different anon_vma (or perhaps to a different - * offset in the same anon_vma). do_swap_page() cannot do all the locking - * needed to reconstitute a cross-anon_vma KSM page: for now it has to make - * a copy, and leave remerging the pages to a later pass of ksmd. - * - * We'd like to make this conditional on vma->vm_flags & VM_MERGEABLE, - * but what if the vma was unmerged while the page was swapped out? - */ -static inline int ksm_might_need_to_copy(struct page *page, - struct vm_area_struct *vma, unsigned long address) -{ - struct anon_vma *anon_vma = page_anon_vma(page); - - return anon_vma && - (anon_vma->root != vma->anon_vma->root || - page->index != linear_page_index(vma, address)); -} - -int page_referenced_ksm(struct page *page, - struct mem_cgroup *memcg, unsigned long *vm_flags); -int try_to_unmap_ksm(struct page *page, enum ttu_flags flags); -int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *, - struct vm_area_struct *, unsigned long, void *), void *arg); -void ksm_migrate_page(struct page *newpage, struct page *oldpage); - -#else /* !CONFIG_KSM */ - -static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) -{ - return 0; -} - -static inline void ksm_exit(struct mm_struct *mm) -{ -} - -static inline int PageKsm(struct page *page) -{ - return 0; -} - -#ifdef CONFIG_MMU -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_might_need_to_copy(struct page *page, - struct vm_area_struct *vma, unsigned long address) -{ - return 0; -} - -static inline int page_referenced_ksm(struct page *page, - struct mem_cgroup *memcg, unsigned long *vm_flags) -{ - return 0; -} - -static inline int try_to_unmap_ksm(struct page *page, enum ttu_flags flags) -{ - return 0; -} - -static inline int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page*, - struct vm_area_struct *, unsigned long, void *), void *arg) -{ - return 0; -} - -static inline void ksm_migrate_page(struct page *newpage, struct page *oldpage) -{ -} -#endif /* CONFIG_MMU */ -#endif /* !CONFIG_KSM */ - -#endif /* __LINUX_KSM_H */ |