fs: introduce write_begin, write_end, and perform_write aops

[linux-2.6] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a6e65d024995ad49a1e9675dea9d36b343ceda60..bc58802663be83a8db2934376e252996e473f614 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1371,7 +1371,13 @@ loop_again:
                        temp_priority[i] = priority;
                        sc.nr_scanned = 0;
                        note_zone_scanning_priority(zone, priority);
-                       nr_reclaimed += shrink_zone(priority, zone, &sc);
+                       /*
+                        * We put equal pressure on every zone, unless one
+                        * zone has way too many pages free already.
+                        */
+                       if (!zone_watermark_ok(zone, order, 8*zone->pages_high,
+                                               end_zone, 0))
+                               nr_reclaimed += shrink_zone(priority, zone, &sc);
                        reclaim_state->reclaimed_slab = 0;
                        nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL,
                                                lru_pages);