Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6

[sfrench/cifs-2.6.git] / mm / slob.c

diff --git a/mm/slob.c b/mm/slob.c
index d50920ecc02bed44acc1dd3cdc2deed467b6b262..ec33fcdc852e2c72ecc95194ada98bf702d3a14a 100644 (file)
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -293,6 +293,7 @@ static void *slob_page_alloc(struct slob_page *sp, size_t size, int align)
 static void *slob_alloc(size_t size, gfp_t gfp, int align, int node)
 {
        struct slob_page *sp;
+       struct list_head *prev;
        slob_t *b = NULL;
        unsigned long flags;
 
@@ -307,12 +308,22 @@ static void *slob_alloc(size_t size, gfp_t gfp, int align, int node)
                if (node != -1 && page_to_nid(&sp->page) != node)
                        continue;
 #endif
+               /* Enough room on this page? */
+               if (sp->units < SLOB_UNITS(size))
+                       continue;
 
-               if (sp->units >= SLOB_UNITS(size)) {
-                       b = slob_page_alloc(sp, size, align);
-                       if (b)
-                               break;
-               }
+               /* Attempt to alloc */
+               prev = sp->list.prev;
+               b = slob_page_alloc(sp, size, align);
+               if (!b)
+                       continue;
+
+               /* Improve fragment distribution and reduce our average
+                * search time by starting our next search here. (see
+                * Knuth vol 1, sec 2.5, pg 449) */
+               if (free_slob_pages.next != prev->next)
+                       list_move_tail(&free_slob_pages, prev->next);
+               break;
        }
        spin_unlock_irqrestore(&slob_lock, flags);