ksm: let shared pages be swappable

[linux-2.6-block.git] / include / linux / rmap.h

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 477841d29fce238a2888a7c0af0c7d05bc795524..0b4913a4a3447eda5a750665501e79e8025c4c4c 100644 (file)
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -39,6 +39,14 @@ struct anon_vma {
 
 #ifdef CONFIG_MMU
 
+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)
 {
        struct anon_vma *anon_vma = vma->anon_vma;
@@ -81,7 +89,24 @@ 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 try_to_unmap(struct page *, int ignore_refs);
+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
@@ -108,6 +133,13 @@ int page_mkclean(struct page *);
  */
 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);
+
 #else  /* !CONFIG_MMU */
 
 #define anon_vma_init()                do {} while (0)