1 files changed, 11 insertions, 79 deletions

diff --git a/mm/swap.c b/mm/swap.c
index bbc1ce9..ab498ea 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -271,94 +271,27 @@ static void update_page_reclaim_stat(struct zone *zone, struct page *page,
 }
 
 /*
- * A page will go to active list either by activate_page or putback_lru_page.
- * In the activate_page case, the page hasn't active bit set. The page might
- * not in LRU list because it's isolated before it gets a chance to be moved to
- * active list. The window is small because pagevec just stores several pages.
- * For such case, we do nothing for such page.
- * In the putback_lru_page case, the page isn't in lru list but has active
- * bit set
+ * FIXME: speed this up?
  */
-static void __activate_page(struct page *page, void *arg)
+void activate_page(struct page *page)
 {
 	struct zone *zone = page_zone(page);
-	int file = page_is_file_cache(page);
-	int lru = page_lru_base_type(page);
-	bool putback = !PageLRU(page);
-
-	/* The page is isolated before it's moved to active list */
-	if (!PageLRU(page) && !PageActive(page))
-		return;
-	if ((PageLRU(page) && PageActive(page)) || PageUnevictable(page))
-		return;
-
-	if (!putback)
-		del_page_from_lru_list(zone, page, lru);
-	else
-		SetPageLRU(page);
-
-	SetPageActive(page);
-	lru += LRU_ACTIVE;
-	add_page_to_lru_list(zone, page, lru);
-
-	if (putback)
-		return;
-	__count_vm_event(PGACTIVATE);
-	update_page_reclaim_stat(zone, page, file, 1);
-}
-
-#ifdef CONFIG_SMP
-static DEFINE_PER_CPU(struct pagevec, activate_page_pvecs);
-
-static void activate_page_drain(int cpu)
-{
-	struct pagevec *pvec = &per_cpu(activate_page_pvecs, cpu);
 
-	if (pagevec_count(pvec))
-		pagevec_lru_move_fn(pvec, __activate_page, NULL);
-}
-
-void activate_page(struct page *page)
-{
+	spin_lock_irq(&zone->lru_lock);
 	if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
-		struct pagevec *pvec = &get_cpu_var(activate_page_pvecs);
-
-		page_cache_get(page);
-		if (!pagevec_add(pvec, page))
-			pagevec_lru_move_fn(pvec, __activate_page, NULL);
-		put_cpu_var(activate_page_pvecs);
-	}
-}
+		int file = page_is_file_cache(page);
+		int lru = page_lru_base_type(page);
+		del_page_from_lru_list(zone, page, lru);
 
-/* Caller should hold zone->lru_lock */
-int putback_active_lru_page(struct zone *zone, struct page *page)
-{
-	struct pagevec *pvec = &get_cpu_var(activate_page_pvecs);
+		SetPageActive(page);
+		lru += LRU_ACTIVE;
+		add_page_to_lru_list(zone, page, lru);
+		__count_vm_event(PGACTIVATE);
 
-	if (!pagevec_add(pvec, page)) {
-		spin_unlock_irq(&zone->lru_lock);
-		pagevec_lru_move_fn(pvec, __activate_page, NULL);
-		spin_lock_irq(&zone->lru_lock);
+		update_page_reclaim_stat(zone, page, file, 1);
 	}
-	put_cpu_var(activate_page_pvecs);
-	return 1;
-}
-
-#else
-static inline void activate_page_drain(int cpu)
-{
-}
-
-void activate_page(struct page *page)
-{
-	struct zone *zone = page_zone(page);
-
-	spin_lock_irq(&zone->lru_lock);
-	if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page))
-		__activate_page(page, NULL);
 	spin_unlock_irq(&zone->lru_lock);
 }
-#endif
 
 /*
  * Mark a page as having seen activity.
@@ -457,7 +390,6 @@ static void drain_cpu_pagevecs(int cpu)
 		pagevec_move_tail(pvec);
 		local_irq_restore(flags);
 	}
-	activate_page_drain(cpu);
 }
 
 void lru_add_drain(void)