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vmscan: fix get_scan_ratio() comment

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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>
This commit is contained in:
Rik van Riel 2008-11-19 15:36:44 -08:00 committed by Linus Torvalds
parent 8e324c19f5
commit 00d8089c54
1 changed files with 3 additions and 3 deletions
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6
mm/vmscan.c
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@ -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;