Re: [PATCH] vmscan: fix get_scan_ratio comment

Rik van Riel
2008-11-17T20:24:38Z

Fix the old comment on the scan ratio calculations.

Signed-off-by: Rik van Riel <riel@redhat.com>
---
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;