linux-kernel - Re: [PATCH] vmscan: fix get_scan

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Message-ID: <20081117152346.363d2145@bree.surriel.com>
Date:	Mon, 17 Nov 2008 15:23:46 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Gene Heskett <gene.heskett@...il.com>
Subject: Re: [PATCH] vmscan: fix get_scan_ratio comment

Fix the old comment on the scan ratio calculations.

Signed-off-by: Rik van Riel <riel@...hat.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;
--
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