page allocator: smarter retry of costly-order allocations

[net-next-2.6.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index eceac9f9032fda78ffd2f79a44f95b4f33762a0f..12e8627c97476905a15cdddef5b5e287d999402d 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1299,6 +1299,9 @@ static unsigned long shrink_zones(int priority, struct zonelist *zonelist,
  * hope that some of these pages can be written.  But if the allocating task
  * holds filesystem locks which prevent writeout this might not work, and the
  * allocation attempt will fail.
+ *
+ * returns:    0, if no pages reclaimed
+ *             else, the number of pages reclaimed
  */
 static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                                        struct scan_control *sc)
@@ -1347,7 +1350,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                }
                total_scanned += sc->nr_scanned;
                if (nr_reclaimed >= sc->swap_cluster_max) {
-                       ret = 1;
+                       ret = nr_reclaimed;
                        goto out;
                }
 
@@ -1370,7 +1373,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
        }
        /* top priority shrink_caches still had more to do? don't OOM, then */
        if (!sc->all_unreclaimable && scan_global_lru(sc))
-               ret = 1;
+               ret = nr_reclaimed;
 out:
        /*
         * Now that we've scanned all the zones at this priority level, note