[PATCH 13/34] mm: page-replace-mark-accessed.patch

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

From: Peter Zijlstra <a.p.zijlstra@chello.nl>

Abstract the page activation.

API:
	void page_replace_mark_accessed(struct page *);

Mark a page as accessed.

XXX: go through tree and rename mark_page_accessed() ?

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Marcelo Tosatti <marcelo.tosatti@cyclades.com>

---

 include/linux/mm_page_replace.h    |    1 +
 include/linux/mm_use_once_policy.h |   26 ++++++++++++++++++++++++++
 mm/swap.c                          |   28 +---------------------------
 3 files changed, 28 insertions(+), 27 deletions(-)

Index: linux-2.6-git/include/linux/mm_use_once_policy.h
===================================================================
--- linux-2.6-git.orig/include/linux/mm_use_once_policy.h
+++ linux-2.6-git/include/linux/mm_use_once_policy.h
@@ -31,6 +31,32 @@ static inline void page_replace_hint_use
 {
 }
 
+/*
+ * Mark a page as having seen activity.
+ *
+ * inactive,unreferenced	->	inactive,referenced
+ * inactive,referenced		->	active,unreferenced
+ * active,unreferenced		->	active,referenced
+ */
+static inline void page_replace_mark_accessed(struct page *page)
+{
+	if (!PageActive(page) && PageReferenced(page) && PageLRU(page)) {
+		struct zone *zone = page_zone(page);
+
+		spin_lock_irq(&zone->lru_lock);
+		if (PageLRU(page) && !PageActive(page)) {
+			del_page_from_inactive_list(zone, page);
+			SetPageActive(page);
+			add_page_to_active_list(zone, page);
+			inc_page_state(pgactivate);
+		}
+		spin_unlock_irq(&zone->lru_lock);
+		ClearPageReferenced(page);
+	} else if (!PageReferenced(page)) {
+		SetPageReferenced(page);
+	}
+}
+
 /* Called without lock on whether page is mapped, so answer is unstable */
 static inline int page_mapping_inuse(struct page *page)
 {
Index: linux-2.6-git/include/linux/mm_page_replace.h
===================================================================
--- linux-2.6-git.orig/include/linux/mm_page_replace.h
+++ linux-2.6-git/include/linux/mm_page_replace.h
@@ -88,6 +88,7 @@ typedef enum {
 /* int page_replace_activate(struct page *page); */
 extern void page_replace_reinsert(struct list_head *);
 extern void page_replace_shrink(struct zone *, struct scan_control *);
+/* void page_replace_mark_accessed(struct page *); */
 
 #ifdef CONFIG_MIGRATION
 extern int page_replace_isolate(struct page *p);
Index: linux-2.6-git/mm/swap.c
===================================================================
--- linux-2.6-git.orig/mm/swap.c
+++ linux-2.6-git/mm/swap.c
@@ -98,37 +98,11 @@ int rotate_reclaimable_page(struct page 
 }
 
 /*
- * FIXME: speed this up?
- */
-void fastcall activate_page(struct page *page)
-{
-	struct zone *zone = page_zone(page);
-
-	spin_lock_irq(&zone->lru_lock);
-	if (PageLRU(page) && !PageActive(page)) {
-		del_page_from_inactive_list(zone, page);
-		SetPageActive(page);
-		add_page_to_active_list(zone, page);
-		inc_page_state(pgactivate);
-	}
-	spin_unlock_irq(&zone->lru_lock);
-}
-
-/*
  * Mark a page as having seen activity.
- *
- * inactive,unreferenced	->	inactive,referenced
- * inactive,referenced		->	active,unreferenced
- * active,unreferenced		->	active,referenced
  */
 void fastcall mark_page_accessed(struct page *page)
 {
-	if (!PageActive(page) && PageReferenced(page) && PageLRU(page)) {
-		activate_page(page);
-		ClearPageReferenced(page);
-	} else if (!PageReferenced(page)) {
-		SetPageReferenced(page);
-	}
+	page_replace_mark_accessed(page);
 }
 
 EXPORT_SYMBOL(mark_page_accessed);

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