linux-kernel - Re: kswapd craziness in 3.7

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Message-ID: <50C0A2EF.6010404@redhat.com>
Date:	Thu, 06 Dec 2012 14:51:43 +0100
From:	Zdenek Kabelac <zkabelac@...hat.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	George Spelvin <linux@...izon.com>,
	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>,
	Thorsten Leemhuis <fedora@...mhuis.info>,
	Tomas Racek <tracek@...hat.com>, Jan Kara <jack@...e.cz>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Josh Boyer <jwboyer@...il.com>, Valdis.Kletnieks@...edu,
	Jiri Slaby <jslaby@...e.cz>, Bruno Wolff III <bruno@...ff.to>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: kswapd craziness in 3.7

Dne 4.12.2012 10:05, Zdenek Kabelac napsal(a):
> Dne 3.12.2012 20:18, Johannes Weiner napsal(a):
>> Szia Zdenek,
>>
>> On Mon, Dec 03, 2012 at 04:23:15PM +0100, Zdenek Kabelac wrote:
>>> Ok, bad news - I've been hit by  kswapd0 loop again -
>>> my kernel git commit cc19528bd3084c3c2d870b31a3578da8c69952f3 again
>>> shown kswapd0 for couple minutes on CPU.
>>>
>>> It seemed to go instantly away when I've drop caches
>>> (echo 3 >/proc/sys/vm/drop_cache)
>>> (After that I've had over 1G free memory)
>>
>> Any chance you could retry with this patch on top?
>>
>> ---
>> From: Johannes Weiner <hannes@...xchg.org>
>> Subject: [patch] mm: vmscan: do not keep kswapd looping forever due
>>   to individual uncompactable zones
>>
>> ---
>>   mm/vmscan.c | 16 ----------------
>>   1 file changed, 16 deletions(-)
>>
>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>
>
> Ok, I'm running now b69f0859dc8e633c5d8c06845811588fe17e68b3 (-rc8)
> with your patch.  I'll be able to give some feedback after couple
> days (if I keep my machine running without reboot - since before

So to just give some positive info -

with  2 1/2 day uptime, several suspend/resumes, ff at 1.4GB
I still have just 29 seconds for kswapd0 process.

So the patch above might have helped - but I'll look for a few more days.

Zdenek
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