page allocator: do not setup zonelist cache when there is only one node

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

diff --git a/mm/vmscan.c b/mm/vmscan.c
index d254306..a6b7d14 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1061,6 +1061,19 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
        unsigned long nr_scanned = 0;
        unsigned long nr_reclaimed = 0;
        struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
+       int lumpy_reclaim = 0;
+
+       /*
+        * If we need a large contiguous chunk of memory, or have
+        * trouble getting a small set of contiguous pages, we
+        * will reclaim both active and inactive pages.
+        *
+        * We use the same threshold as pageout congestion_wait below.
+        */
+       if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
+               lumpy_reclaim = 1;
+       else if (sc->order && priority < DEF_PRIORITY - 2)
+               lumpy_reclaim = 1;
 
        pagevec_init(&pvec, 1);
 
@@ -1073,19 +1086,7 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
                unsigned long nr_freed;
                unsigned long nr_active;
                unsigned int count[NR_LRU_LISTS] = { 0, };
-               int mode = ISOLATE_INACTIVE;
-
-               /*
-                * If we need a large contiguous chunk of memory, or have
-                * trouble getting a small set of contiguous pages, we
-                * will reclaim both active and inactive pages.
-                *
-                * We use the same threshold as pageout congestion_wait below.
-                */
-               if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
-                       mode = ISOLATE_BOTH;
-               else if (sc->order && priority < DEF_PRIORITY - 2)
-                       mode = ISOLATE_BOTH;
+               int mode = lumpy_reclaim ? ISOLATE_BOTH : ISOLATE_INACTIVE;
 
                nr_taken = sc->isolate_pages(sc->swap_cluster_max,
                             &page_list, &nr_scan, sc->order, mode,
@@ -1122,7 +1123,7 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
                 * but that should be acceptable to the caller
                 */
                if (nr_freed < nr_taken && !current_is_kswapd() &&
-                                       sc->order > PAGE_ALLOC_COSTLY_ORDER) {
+                   lumpy_reclaim) {
                        congestion_wait(WRITE, HZ/10);
 
                        /*
@@ -2056,7 +2057,7 @@ unsigned long global_lru_pages(void)
                + global_page_state(NR_INACTIVE_FILE);
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_HIBERNATION
 /*
  * Helper function for shrink_all_memory().  Tries to reclaim 'nr_pages' pages
  * from LRU lists system-wide, for given pass and priority.
@@ -2196,7 +2197,7 @@ out:
 
        return sc.nr_reclaimed;
 }
-#endif
+#endif /* CONFIG_HIBERNATION */
 
 /* It's optimal to keep kswapds on the same CPUs as their memory, but
    not required for correctness.  So if the last cpu in a node goes