Re: [PATCH] vmscan: fix get_scan_ratio comment

[Rik van Riel]

Fix the old comment on the scan ratio calculations.

Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
---
 mm/vmscan.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6.28-rc5/mm/vmscan.c
===================================================================
--- linux-2.6.28-rc5.orig/mm/vmscan.c	2008-11-16 17:47:13.000000000 -0500
+++ linux-2.6.28-rc5/mm/vmscan.c	2008-11-17 15:22:22.000000000 -0500
@@ -1386,9 +1386,9 @@ static void get_scan_ratio(struct zone *
 	file_prio = 200 - sc->swappiness;
 
 	/*
-	 *                  anon       recent_rotated[0]
-	 * %anon = 100 * ----------- / ----------------- * IO cost
-	 *               anon + file      rotate_sum
+	 * The amount of pressure on anon vs file pages is inversely
+	 * proportional to the fraction of recently scanned pages on
+	 * each list that were recently referenced and in active use.
 	 */
 	ap = (anon_prio + 1) * (zone->recent_scanned[0] + 1);
 	ap /= zone->recent_rotated[0] + 1;
--
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