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

[cascardo/linux.git] / include / linux / swap.h

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 4348d95..4bdbee8 100644 (file)
--- 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