Merge branch 'iommu-fixes-2.6.28' of git://git.kernel.org/pub/scm/linux/kernel/git...

[pandora-kernel.git] / include / linux / mm_inline.h

diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 895bc4e..c948350 100644 (file)
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -1,40 +1,100 @@
-static inline void
-add_page_to_active_list(struct zone *zone, struct page *page)
-{
-       list_add(&page->lru, &zone->active_list);
-       __inc_zone_state(zone, NR_ACTIVE);
-}
+#ifndef LINUX_MM_INLINE_H
+#define LINUX_MM_INLINE_H
 
-static inline void
-add_page_to_inactive_list(struct zone *zone, struct page *page)
+/**
+ * page_is_file_cache - should the page be on a file LRU or anon LRU?
+ * @page: the page to test
+ *
+ * Returns LRU_FILE if @page is page cache page backed by a regular filesystem,
+ * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
+ * Used by functions that manipulate the LRU lists, to sort a page
+ * onto the right LRU list.
+ *
+ * We would like to get this info without a page flag, but the state
+ * needs to survive until the page is last deleted from the LRU, which
+ * could be as far down as __page_cache_release.
+ */
+static inline int page_is_file_cache(struct page *page)
 {
-       list_add(&page->lru, &zone->inactive_list);
-       __inc_zone_state(zone, NR_INACTIVE);
+       if (PageSwapBacked(page))
+               return 0;
+
+       /* The page is page cache backed by a normal filesystem. */
+       return LRU_FILE;
 }
 
 static inline void
-del_page_from_active_list(struct zone *zone, struct page *page)
+add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l)
 {
-       list_del(&page->lru);
-       __dec_zone_state(zone, NR_ACTIVE);
+       list_add(&page->lru, &zone->lru[l].list);
+       __inc_zone_state(zone, NR_LRU_BASE + l);
 }
 
 static inline void
-del_page_from_inactive_list(struct zone *zone, struct page *page)
+del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l)
 {
        list_del(&page->lru);
-       __dec_zone_state(zone, NR_INACTIVE);
+       __dec_zone_state(zone, NR_LRU_BASE + l);
 }
 
 static inline void
 del_page_from_lru(struct zone *zone, struct page *page)
 {
+       enum lru_list l = LRU_BASE;
+
        list_del(&page->lru);
-       if (PageActive(page)) {
-               __ClearPageActive(page);
-               __dec_zone_state(zone, NR_ACTIVE);
+       if (PageUnevictable(page)) {
+               __ClearPageUnevictable(page);
+               l = LRU_UNEVICTABLE;
        } else {
-               __dec_zone_state(zone, NR_INACTIVE);
+               if (PageActive(page)) {
+                       __ClearPageActive(page);
+                       l += LRU_ACTIVE;
+               }
+               l += page_is_file_cache(page);
+       }
+       __dec_zone_state(zone, NR_LRU_BASE + l);
+}
+
+/**
+ * page_lru - which LRU list should a page be on?
+ * @page: the page to test
+ *
+ * Returns the LRU list a page should be on, as an index
+ * into the array of LRU lists.
+ */
+static inline enum lru_list page_lru(struct page *page)
+{
+       enum lru_list lru = LRU_BASE;
+
+       if (PageUnevictable(page))
+               lru = LRU_UNEVICTABLE;
+       else {
+               if (PageActive(page))
+                       lru += LRU_ACTIVE;
+               lru += page_is_file_cache(page);
        }
+
+       return lru;
 }
 
+/**
+ * inactive_anon_is_low - check if anonymous pages need to be deactivated
+ * @zone: zone to check
+ *
+ * Returns true if the zone does not have enough inactive anon pages,
+ * meaning some active anon pages need to be deactivated.
+ */
+static inline int inactive_anon_is_low(struct zone *zone)
+{
+       unsigned long active, inactive;
+
+       active = zone_page_state(zone, NR_ACTIVE_ANON);
+       inactive = zone_page_state(zone, NR_INACTIVE_ANON);
+
+       if (inactive * zone->inactive_ratio < active)
+               return 1;
+
+       return 0;
+}
+#endif