linux-kernel - Re: kswapd craziness round 2

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Date:	Thu, 21 Feb 2013 20:07:03 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Daniel J Blueman <daniel@...ascale-asia.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Steffen Persvold <sp@...ascale.com>
Subject: Re: kswapd craziness round 2

On Thu, Feb 21, 2013 at 6:14 AM, Jiri Slaby <jslaby@...e.cz> wrote:
>>
>> Does Ingo's revert help? https://lkml.org/lkml/2013/2/15/168
>
> Not at all...
>
Then mind taking a try?

--- a/mm/vmscan.c	Thu Feb 21 20:01:02 2013
+++ b/mm/vmscan.c	Thu Feb 21 20:05:58 2013
@@ -1715,7 +1715,7 @@ static void get_scan_count(struct lruvec
 	 * to swap.  Better start now and leave the - probably heavily
 	 * thrashing - remaining file pages alone.
 	 */
-	if (global_reclaim(sc)) {
+	if (global_reclaim(sc) && sc->priority >= DEF_PRIORITY - 2) {
 		free = zone_page_state(zone, NR_FREE_PAGES);
 		if (unlikely(file + free <= high_wmark_pages(zone))) {
 			scan_balance = SCAN_ANON;
@@ -2840,9 +2840,10 @@ out:
 		 * reclaim if they wish.
 		 */
 		if (sc.nr_reclaimed < SWAP_CLUSTER_MAX)
-			order = sc.order = 0;
-
-		goto loop_again;
+			if (order != 0) {
+				sc.order = order = 0;
+				goto loop_again;
+			}
 	}

 	/*
--
--
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