]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commitdiff
vmscan: fix get_scan_ratio() comment
authorRik van Riel <riel@redhat.com>
Wed, 19 Nov 2008 23:36:44 +0000 (15:36 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 20 Nov 2008 02:49:59 +0000 (18:49 -0800)
Fix the old comment on the scan ratio calculations.

Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/vmscan.c

index f83a7ed5c6c43ef6fb80d95777affedd9e43b51b..7ea1440b53db23350112cb1a46c592542807e4ac 100644 (file)
@@ -1389,9 +1389,9 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
        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;