mm: use zone->present_pages instead of zone->managed_pages where appropriate

Now we have zone->managed_pages for "pages managed by the buddy system
in the zone", so replace zone->present_pages with zone->managed_pages if
what the user really wants is number of allocatable pages.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Maciej Rutecki <maciej.rutecki@gmail.com>
Cc: Chris Clayton <chris2553@googlemail.com>
Cc: "Rafael J . Wysocki" <rjw@sisk.pl>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Jianguo Wu <wujianguo@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 7 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 4093b99044f6..8fde2fc223d9 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2010,7 +2010,7 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
          * a reasonable chance of completing and allocating the page
          */
         balance_gap = min(low_wmark_pages(zone),
-                (zone->present_pages + KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
+                (zone->managed_pages + KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
                         KSWAPD_ZONE_BALANCE_GAP_RATIO);
         watermark = high_wmark_pages(zone) + balance_gap + (2UL << sc->order);
         watermark_ok = zone_watermark_ok_safe(zone, 0, watermark, 0, 0);
@@ -2525,7 +2525,7 @@ static bool zone_balanced(struct zone *zone, int order,
  */
 static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx)
 {
-        unsigned long present_pages = 0;
+        unsigned long managed_pages = 0;
         unsigned long balanced_pages = 0;
         int i;
 
@@ -2536,7 +2536,7 @@ static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx)
                 if (!populated_zone(zone))
                         continue;
 
-                present_pages += zone->present_pages;
+                managed_pages += zone->managed_pages;
 
                 /*
                  * A special case here:
@@ -2546,18 +2546,18 @@ static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx)
                  * they must be considered balanced here as well!
                  */
                 if (zone->all_unreclaimable) {
-                        balanced_pages += zone->present_pages;
+                        balanced_pages += zone->managed_pages;
                         continue;
                 }
 
                 if (zone_balanced(zone, order, 0, i))
-                        balanced_pages += zone->present_pages;
+                        balanced_pages += zone->managed_pages;
                 else if (!order)
                         return false;
         }
 
         if (order)
-                return balanced_pages >= (present_pages >> 2);
+                return balanced_pages >= (managed_pages >> 2);
         else
                 return true;
 }
@@ -2745,7 +2745,7 @@ loop_again:
                          * of the zone, whichever is smaller.
                          */
                         balance_gap = min(low_wmark_pages(zone),
-                                (zone->present_pages +
+                                (zone->managed_pages +
                                         KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
                                 KSWAPD_ZONE_BALANCE_GAP_RATIO);
                         /*