linux-kernel - Re: kswapd craziness round 2

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Date:	Fri, 8 Mar 2013 14:42:31 +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>, mm <linux-mm@...ck.org>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: kswapd craziness round 2

On Fri, Mar 8, 2013 at 3:37 AM, Jiri Slaby <jslaby@...e.cz> wrote:
> On 03/01/2013 03:02 PM, Hillf Danton wrote:
>> 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.
>
> Oh, it seems to be nice now:
> root       579  0.0  0.0      0     0 ?        S    Mar04   0:13 [kswapd0]
>
Double thanks.

But Mel does not like it, probably.
Lets try nap in another way.

Hillf

--- a/mm/vmscan.c	Thu Feb 21 20:01:02 2013
+++ b/mm/vmscan.c	Fri Mar  8 14:36:10 2013
@@ -2793,6 +2793,10 @@ loop_again:
 				 * speculatively avoid congestion waits
 				 */
 				zone_clear_flag(zone, ZONE_CONGESTED);
+
+			else if (sc.priority > 2 &&
+				 sc.priority < DEF_PRIORITY - 2)
+				wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
 		}

 		/*
--

>>
>> --- 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:
>> --
>>
>
>
> --
> js
> suse labs
--
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