linux-kernel - Re: swap storm since kernel 3.2.x

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Message-ID: <CAJd=RBBqGpgn=9R5-T0YOOzsQcS1L7V=T2v8upTHp8ARczZJGQ@mail.gmail.com>
Date:	Fri, 10 Feb 2012 20:36:42 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Johannes Stezenbach <js@...21.net>,
	Toralf Förster <toralf.foerster@....de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: swap storm since kernel 3.2.x

On Thu, Feb 9, 2012 at 10:06 PM, Rik van Riel <riel@...hat.com> wrote:
> On 02/09/2012 08:54 AM, Johannes Stezenbach wrote:
>>
>> On Thu, Feb 09, 2012 at 02:21:55PM +0100, Johannes Stezenbach wrote:
>>>
>>> it looks good.  Neither do I get the huge debug_objects_cache
>>> nor does it swap, after running a crosstool-ng toolchain build.
>>> Well, last time I also had one kvm -m 1G instance running.  I'll
>>> try if that triggers the issue.  So far:
>>
>>
>> The kvm produced a bunch of page allocation failures
>> on the host:
>
>
>> (repeats a few times)
>>
>> I guess that is expected with your patch?
>
>
> That is indeed why my patch series was significantly larger
> than Hillf's little test patch :)
>

Yes, Johannes did show that kswapd running purely in single
mode, without helps from compaction or lumpy, could not
meet all requests in VM core.

Thank you all
Hillf
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