[PATCH] mm/vmscan.c: use DIV_ROUND_UP for calculation of zone's balance_gap and correct comments.

[Jianyu Zhan <nasa4836@gmail.com>]

Currently, we use (zone->managed_pages + KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
KSWAPD_ZONE_BALANCE_GAP_RATIO to avoid a zero gap value. It's better to
use DIV_ROUND_UP macro for neater code and clear meaning.

Besides, the gap value is calculated against the per-zone "managed pages",
not "present pages". This patch also corrects the comment and do some
rephrasing.

Signed-off-by: Jianyu Zhan <nasa4836@gmail.com>
---
 include/linux/swap.h |  8 ++++----
 mm/vmscan.c          | 10 ++++------
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 5a14b92..58e1696 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -166,10 +166,10 @@ enum {
 #define COMPACT_CLUSTER_MAX SWAP_CLUSTER_MAX
 
 /*
- * Ratio between the present memory in the zone and the "gap" that
- * we're allowing kswapd to shrink in addition to the per-zone high
- * wmark, even for zones that already have the high wmark satisfied,
- * in order to provide better per-zone lru behavior. We are ok to
+ * Ratio between zone->managed_pages and the "gap" that above the per-zone
+ * "high_wmark". While balancing nodes, We allow kswapd to shrink zones that
+ * do not meet the (high_wmark + gap) watermark, even which already met the
+ * high_wmark, in order to provide better per-zone lru behavior. We are ok to
  * spend not more than 1% of the memory for this zone balancing "gap".
  */
 #define KSWAPD_ZONE_BALANCE_GAP_RATIO 100
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 32c661d..9ef9f6c 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2268,9 +2268,8 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
 	 * there is a buffer of free pages available to give compaction
 	 * a reasonable chance of completing and allocating the page
 	 */
-	balance_gap = min(low_wmark_pages(zone),
-		(zone->managed_pages + KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
-			KSWAPD_ZONE_BALANCE_GAP_RATIO);
+	balance_gap = min(low_wmark_pages(zone), DIV_ROUND_UP(
+			zone->managed_pages, 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);
 
@@ -2891,9 +2890,8 @@ static bool kswapd_shrink_zone(struct zone *zone,
 	 * high wmark plus a "gap" where the gap is either the low
 	 * watermark or 1% of the zone, whichever is smaller.
 	 */
-	balance_gap = min(low_wmark_pages(zone),
-		(zone->managed_pages + KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
-		KSWAPD_ZONE_BALANCE_GAP_RATIO);
+	balance_gap = min(low_wmark_pages(zone), DIV_ROUND_UP(
+			zone->managed_pages, KSWAPD_ZONE_BALANCE_GAP_RATIO));
 
 	/*
 	 * If there is no low memory pressure or the zone is balanced then no
-- 
2.0.0-rc3

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