1 files changed, 36 insertions, 6 deletions

diff --git a/mm/swap.c b/mm/swap.c
index 0b1974a08974..fee6b973f143 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -115,7 +115,7 @@ static void pagevec_move_tail(struct pagevec *pvec)
                         zone = pagezone;
                         spin_lock(&zone->lru_lock);
                 }
-                if (PageLRU(page) && !PageActive(page)) {
+                if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
                         int lru = page_is_file_cache(page);
                         list_move_tail(&page->lru, &zone->lru[lru].list);
                         pgmoved++;
@@ -136,7 +136,7 @@ static void pagevec_move_tail(struct pagevec *pvec)
 void  rotate_reclaimable_page(struct page *page)
 {
         if (!PageLocked(page) && !PageDirty(page) && !PageActive(page) &&
-            PageLRU(page)) {
+            !PageUnevictable(page) && PageLRU(page)) {
                 struct pagevec *pvec;
                 unsigned long flags;
 
@@ -157,7 +157,7 @@ void activate_page(struct page *page)
         struct zone *zone = page_zone(page);
 
         spin_lock_irq(&zone->lru_lock);
-        if (PageLRU(page) && !PageActive(page)) {
+        if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
                 int file = page_is_file_cache(page);
                 int lru = LRU_BASE + file;
                 del_page_from_lru_list(zone, page, lru);
@@ -166,7 +166,7 @@ void activate_page(struct page *page)
                 lru += LRU_ACTIVE;
                 add_page_to_lru_list(zone, page, lru);
                 __count_vm_event(PGACTIVATE);
-                mem_cgroup_move_lists(page, true);
+                mem_cgroup_move_lists(page, lru);
 
                 zone->recent_rotated[!!file]++;
                 zone->recent_scanned[!!file]++;
@@ -183,7 +183,8 @@ void activate_page(struct page *page)
  */
 void mark_page_accessed(struct page *page)
 {
-        if (!PageActive(page) && PageReferenced(page) && PageLRU(page)) {
+        if (!PageActive(page) && !PageUnevictable(page) &&
+                        PageReferenced(page) && PageLRU(page)) {
                 activate_page(page);
                 ClearPageReferenced(page);
         } else if (!PageReferenced(page)) {
@@ -211,13 +212,38 @@ void __lru_cache_add(struct page *page, enum lru_list lru)
 void lru_cache_add_lru(struct page *page, enum lru_list lru)
 {
         if (PageActive(page)) {
+                VM_BUG_ON(PageUnevictable(page));
                 ClearPageActive(page);
+        } else if (PageUnevictable(page)) {
+                VM_BUG_ON(PageActive(page));
+                ClearPageUnevictable(page);
         }
 
-        VM_BUG_ON(PageLRU(page) || PageActive(page));
+        VM_BUG_ON(PageLRU(page) || PageActive(page) || PageUnevictable(page));
         __lru_cache_add(page, lru);
 }
 
+/**
+ * add_page_to_unevictable_list - add a page to the unevictable list
+ * @page:  the page to be added to the unevictable list
+ *
+ * Add page directly to its zone's unevictable list.  To avoid races with
+ * tasks that might be making the page evictable, through eg. munlock,
+ * munmap or exit, while it's not on the lru, we want to add the page
+ * while it's locked or otherwise "invisible" to other tasks.  This is
+ * difficult to do when using the pagevec cache, so bypass that.
+ */
+void add_page_to_unevictable_list(struct page *page)
+{
+        struct zone *zone = page_zone(page);
+
+        spin_lock_irq(&zone->lru_lock);
+        SetPageUnevictable(page);
+        SetPageLRU(page);
+        add_page_to_lru_list(zone, page, LRU_UNEVICTABLE);
+        spin_unlock_irq(&zone->lru_lock);
+}
+
 /*
  * Drain pages out of the cpu's pagevecs.
  * Either "cpu" is the current CPU, and preemption has already been
@@ -316,6 +342,7 @@ void release_pages(struct page **pages, int nr, int cold)
 
                 if (PageLRU(page)) {
                         struct zone *pagezone = page_zone(page);
+
                         if (pagezone != zone) {
                                 if (zone)
                                         spin_unlock_irqrestore(&zone->lru_lock,
@@ -392,6 +419,7 @@ void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru)
 {
         int i;
         struct zone *zone = NULL;
+        VM_BUG_ON(is_unevictable_lru(lru));
 
         for (i = 0; i < pagevec_count(pvec); i++) {
                 struct page *page = pvec->pages[i];
@@ -403,6 +431,8 @@ void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru)
                         zone = pagezone;
                         spin_lock_irq(&zone->lru_lock);
                 }
+                VM_BUG_ON(PageActive(page));
+                VM_BUG_ON(PageUnevictable(page));
                 VM_BUG_ON(PageLRU(page));
                 SetPageLRU(page);
                 if (is_active_lru(lru))