mm: don't waste swap on locked pages

[pandora-kernel.git] / mm / rmap.c

diff --git a/mm/rmap.c b/mm/rmap.c
index dc3be5f..57ad276 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -36,7 +36,6 @@
  *                 mapping->tree_lock (widely used, in set_page_dirty,
  *                           in arch-dependent flush_dcache_mmap_lock,
  *                           within inode_lock in __sync_single_inode)
- *                   zone->lock (within radix tree node alloc)
  */
 
 #include <linux/mm.h>
@@ -284,7 +283,10 @@ static int page_referenced_one(struct page *page,
        if (!pte)
                goto out;
 
-       if (ptep_clear_flush_young(vma, address, pte))
+       if (vma->vm_flags & VM_LOCKED) {
+               referenced++;
+               *mapcount = 1;  /* break early from loop */
+       } else if (ptep_clear_flush_young(vma, address, pte))
                referenced++;
 
        /* Pretend the page is referenced if the task has the
@@ -471,11 +473,12 @@ int page_mkclean(struct page *page)
 
        if (page_mapped(page)) {
                struct address_space *mapping = page_mapping(page);
-               if (mapping)
+               if (mapping) {
                        ret = page_mkclean_file(mapping, page);
-               if (page_test_dirty(page)) {
-                       page_clear_dirty(page);
-                       ret = 1;
+                       if (page_test_dirty(page)) {
+                               page_clear_dirty(page);
+                               ret = 1;
+                       }
                }
        }