*/
struct anon_vma {
spinlock_t lock; /* Serialize access to vma list */
+#ifdef CONFIG_KSM
+ atomic_t ksm_refcount;
+#endif
/*
* NOTE: the LSB of the head.next is set by
* mm_take_all_locks() _after_ taking the above lock. So the
* is serialized by a system wide lock only visible to
* mm_take_all_locks() (mm_all_locks_mutex).
*/
- struct list_head head; /* List of private "related" vmas */
+ struct list_head head; /* Chain of private "related" vmas */
+};
+
+/*
+ * The copy-on-write semantics of fork mean that an anon_vma
+ * can become associated with multiple processes. Furthermore,
+ * each child process will have its own anon_vma, where new
+ * pages for that process are instantiated.
+ *
+ * This structure allows us to find the anon_vmas associated
+ * with a VMA, or the VMAs associated with an anon_vma.
+ * The "same_vma" list contains the anon_vma_chains linking
+ * all the anon_vmas associated with this VMA.
+ * The "same_anon_vma" list contains the anon_vma_chains
+ * which link all the VMAs associated with this anon_vma.
+ */
+struct anon_vma_chain {
+ struct vm_area_struct *vma;
+ struct anon_vma *anon_vma;
+ struct list_head same_vma; /* locked by mmap_sem & page_table_lock */
+ struct list_head same_anon_vma; /* locked by anon_vma->lock */
};
#ifdef CONFIG_MMU
+#ifdef CONFIG_KSM
+static inline void ksm_refcount_init(struct anon_vma *anon_vma)
+{
+ atomic_set(&anon_vma->ksm_refcount, 0);
+}
-extern struct kmem_cache *anon_vma_cachep;
+static inline int ksm_refcount(struct anon_vma *anon_vma)
+{
+ return atomic_read(&anon_vma->ksm_refcount);
+}
+#else
+static inline void ksm_refcount_init(struct anon_vma *anon_vma)
+{
+}
-static inline struct anon_vma *anon_vma_alloc(void)
+static inline int ksm_refcount(struct anon_vma *anon_vma)
{
- return kmem_cache_alloc(anon_vma_cachep, GFP_KERNEL);
+ return 0;
}
+#endif /* CONFIG_KSM */
-static inline void anon_vma_free(struct anon_vma *anon_vma)
+static inline struct anon_vma *page_anon_vma(struct page *page)
{
- kmem_cache_free(anon_vma_cachep, anon_vma);
+ if (((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) !=
+ PAGE_MAPPING_ANON)
+ return NULL;
+ return page_rmapping(page);
}
static inline void anon_vma_lock(struct vm_area_struct *vma)
*/
void anon_vma_init(void); /* create anon_vma_cachep */
int anon_vma_prepare(struct vm_area_struct *);
-void __anon_vma_merge(struct vm_area_struct *, struct vm_area_struct *);
-void anon_vma_unlink(struct vm_area_struct *);
-void anon_vma_link(struct vm_area_struct *);
+void unlink_anon_vmas(struct vm_area_struct *);
+int anon_vma_clone(struct vm_area_struct *, struct vm_area_struct *);
+int anon_vma_fork(struct vm_area_struct *, struct vm_area_struct *);
void __anon_vma_link(struct vm_area_struct *);
+void anon_vma_free(struct anon_vma *);
+
+static inline void anon_vma_merge(struct vm_area_struct *vma,
+ struct vm_area_struct *next)
+{
+ VM_BUG_ON(vma->anon_vma != next->anon_vma);
+ unlink_anon_vmas(next);
+}
/*
* rmap interfaces called when adding or removing pte of page
*/
+void page_move_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
void page_add_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
void page_add_new_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
void page_add_file_rmap(struct page *);
-void page_remove_rmap(struct page *, struct vm_area_struct *);
+void page_remove_rmap(struct page *);
-#ifdef CONFIG_DEBUG_VM
-void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address);
-#else
-static inline void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address)
+static inline void page_dup_rmap(struct page *page)
{
atomic_inc(&page->_mapcount);
}
-#endif
/*
* Called from mm/vmscan.c to handle paging out
*/
-int page_referenced(struct page *, int is_locked, struct mem_cgroup *cnt);
-int try_to_unmap(struct page *, int ignore_refs);
+int page_referenced(struct page *, int is_locked,
+ struct mem_cgroup *cnt, unsigned long *vm_flags);
+int page_referenced_one(struct page *, struct vm_area_struct *,
+ unsigned long address, unsigned int *mapcount, unsigned long *vm_flags);
+
+enum ttu_flags {
+ TTU_UNMAP = 0, /* unmap mode */
+ TTU_MIGRATION = 1, /* migration mode */
+ TTU_MUNLOCK = 2, /* munlock mode */
+ TTU_ACTION_MASK = 0xff,
+
+ TTU_IGNORE_MLOCK = (1 << 8), /* ignore mlock */
+ TTU_IGNORE_ACCESS = (1 << 9), /* don't age */
+ TTU_IGNORE_HWPOISON = (1 << 10),/* corrupted page is recoverable */
+};
+#define TTU_ACTION(x) ((x) & TTU_ACTION_MASK)
+
+int try_to_unmap(struct page *, enum ttu_flags flags);
+int try_to_unmap_one(struct page *, struct vm_area_struct *,
+ unsigned long address, enum ttu_flags flags);
/*
* Called from mm/filemap_xip.c to unmap empty zero page
*/
int page_mkclean(struct page *);
+/*
+ * called in munlock()/munmap() path to check for other vmas holding
+ * the page mlocked.
+ */
+int try_to_munlock(struct page *);
+
+/*
+ * Called by memory-failure.c to kill processes.
+ */
+struct anon_vma *page_lock_anon_vma(struct page *page);
+void page_unlock_anon_vma(struct anon_vma *anon_vma);
+int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma);
+
+/*
+ * Called by migrate.c to remove migration ptes, but might be used more later.
+ */
+int rmap_walk(struct page *page, int (*rmap_one)(struct page *,
+ struct vm_area_struct *, unsigned long, void *), void *arg);
+
#else /* !CONFIG_MMU */
#define anon_vma_init() do {} while (0)
#define anon_vma_prepare(vma) (0)
#define anon_vma_link(vma) do {} while (0)
-#define page_referenced(page,l,cnt) TestClearPageReferenced(page)
+static inline int page_referenced(struct page *page, int is_locked,
+ struct mem_cgroup *cnt,
+ unsigned long *vm_flags)
+{
+ *vm_flags = 0;
+ return 0;
+}
+
#define try_to_unmap(page, refs) SWAP_FAIL
static inline int page_mkclean(struct page *page)
#define SWAP_SUCCESS 0
#define SWAP_AGAIN 1
#define SWAP_FAIL 2
+#define SWAP_MLOCK 3
#endif /* _LINUX_RMAP_H */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff