linux-kernel - Re: kswapd craziness round 2

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Message-ID: <CAJd=RBD=eT=xdEy+v3GBZ47gd47eB+fpF-3VtfpLAU7aEkZGgA@mail.gmail.com>
Date:	Fri, 1 Mar 2013 22:02:28 +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 Fri, Mar 1, 2013 at 1:02 AM, Jiri Slaby <jslaby@...e.cz> wrote:
>
> Ok, no difference, kswap is still crazy. I'm attaching the output of
> "grep -vw '0' /proc/vmstat" if you see something there.
>
Thanks to you for test and data.

Lets try to restore the deleted nap, then.

Hillf
--- a/mm/vmscan.c	Thu Feb 21 20:01:02 2013
+++ b/mm/vmscan.c	Fri Mar  1 21:55:40 2013
@@ -2817,6 +2817,10 @@ loop_again:
 		 */
 		if (sc.nr_reclaimed >= SWAP_CLUSTER_MAX)
 			break;
+
+		if (sc.priority < DEF_PRIORITY - 2)
+			congestion_wait(BLK_RW_ASYNC, HZ/10);
+
 	} while (--sc.priority >= 0);

 out:
--
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