mm: memcontrol: rewrite charge API

[cascardo/linux.git] / mm / swap.c

diff --git a/mm/swap.c b/mm/swap.c
index c789d01..3baca70 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -687,6 +687,40 @@ void add_page_to_unevictable_list(struct page *page)
        spin_unlock_irq(&zone->lru_lock);
 }
 
+/**
+ * lru_cache_add_active_or_unevictable
+ * @page:  the page to be added to LRU
+ * @vma:   vma in which page is mapped for determining reclaimability
+ *
+ * Place @page on the active or unevictable LRU list, depending on its
+ * evictability.  Note that if the page is not evictable, it goes
+ * directly back onto it's zone's unevictable list, it does NOT use a
+ * per cpu pagevec.
+ */
+void lru_cache_add_active_or_unevictable(struct page *page,
+                                        struct vm_area_struct *vma)
+{
+       VM_BUG_ON_PAGE(PageLRU(page), page);
+
+       if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) {
+               SetPageActive(page);
+               lru_cache_add(page);
+               return;
+       }
+
+       if (!TestSetPageMlocked(page)) {
+               /*
+                * We use the irq-unsafe __mod_zone_page_stat because this
+                * counter is not modified from interrupt context, and the pte
+                * lock is held(spinlock), which implies preemption disabled.
+                */
+               __mod_zone_page_state(page_zone(page), NR_MLOCK,
+                                   hpage_nr_pages(page));
+               count_vm_event(UNEVICTABLE_PGMLOCKED);
+       }
+       add_page_to_unevictable_list(page);
+}
+
 /*
  * If the page can not be invalidated, it is moved to the
  * inactive list to speed up its reclaim.  It is moved to the