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authorRik van Riel <riel@redhat.com>2008-11-19 15:36:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-19 18:49:59 -0800
commit00d8089c54867053a5aae062b765f257ca419e27 (patch)
treea976481b5d503fde553b8816edb01f310f3a505a /mm
parent8e324c19f57cc05922e9cc0f338b58108da45539 (diff)
downloadlinux-2.6.34-ux500-00d8089c54867053a5aae062b765f257ca419e27.tar.gz
vmscan: fix get_scan_ratio() comment
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmscan.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f83a7ed5c6c..7ea1440b53d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -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;