ksm: rmap_walk to remove_migation_ptes

[mv-sheeva.git] / include / linux / rmap.h

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index cb0ba7032609d5602a709a54f4b012413b981587..b019ae64e2ab1d356daf92aaa7e92547227246c7 100644 (file)
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -26,6 +26,9 @@
  */
 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
@@ -38,6 +41,34 @@ struct anon_vma {
 };
 
 #ifdef CONFIG_MMU
+#ifdef CONFIG_KSM
+static inline void ksm_refcount_init(struct anon_vma *anon_vma)
+{
+       atomic_set(&anon_vma->ksm_refcount, 0);
+}
+
+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 int ksm_refcount(struct anon_vma *anon_vma)
+{
+       return 0;
+}
+#endif /* CONFIG_KSM */
+
+static inline struct anon_vma *page_anon_vma(struct page *page)
+{
+       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)
 {
@@ -62,6 +93,7 @@ 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 __anon_vma_link(struct vm_area_struct *);
+void anon_vma_free(struct anon_vma *);
 
 /*
  * rmap interfaces called when adding or removing pte of page
@@ -81,6 +113,9 @@ static inline void page_dup_rmap(struct page *page)
  */
 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 */
@@ -94,6 +129,8 @@ enum ttu_flags {
 #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
@@ -127,6 +164,12 @@ 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)