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Message-ID: <5174E2E0.4030605@gmail.com>
Date: Mon, 22 Apr 2013 15:12:32 +0800
From: Simon Jeons <simon.jeons@gmail.com>
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To: Zlatko Calusic <zcalusic@bitsync.net>
CC: Mel Gorman <mgorman@suse.de>, Andrew Morton <akpm@linux-foundation.org>,
        Jiri Slaby <jslaby@suse.cz>,
        Valdis Kletnieks <Valdis.Kletnieks@vt.edu>,
        Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>,
        dormando <dormando@rydia.net>, Satoru Moriya <satoru.moriya@hds.com>,
        Michal Hocko <mhocko@suse.cz>, Linux-MM <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/10] Reduce system disruption due to kswapd V2
References: <1365505625-9460-1-git-send-email-mgorman@suse.de> <51672331.6070605@bitsync.net> <20130412193947.GJ11656@suse.de> <5168699A.40407@bitsync.net> <5174DA8F.2020400@bitsync.net> <5174DC17.6000809@gmail.com> <5174DEA0.8010501@bitsync.net>
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Hi Zlatko,
On 04/22/2013 02:54 PM, Zlatko Calusic wrote:
> On 22.04.2013 08:43, Simon Jeons wrote:
>> Hi Zlatko,
>> On 04/22/2013 02:37 PM, Zlatko Calusic wrote:
>>> On 12.04.2013 22:07, Zlatko Calusic wrote:
>>>> On 12.04.2013 21:40, Mel Gorman wrote:
>>>>> On Thu, Apr 11, 2013 at 10:55:13PM +0200, Zlatko Calusic wrote:
>>>>>> On 09.04.2013 13:06, Mel Gorman wrote:
>>>>>> <SNIP>
>>>>>>
>>>>>> - The only slightly negative thing I observed is that with the patch
>>>>>> applied kswapd burns 10x - 20x more CPU. So instead of about 15
>>>>>> seconds, it has now spent more than 4 minutes on one particular
>>>>>> machine with a quite steady load (after about 12 days of uptime).
>>>>>> Admittedly, that's still nothing too alarming, but...
>>>>>>
>>>>>
>>>>> Would you happen to know what circumstances trigger the higher CPU
>>>>> usage?
>>>>>
>>>>
>>>> Really nothing special. The server is lightly loaded, but it does 
>>>> enough
>>>> reading from the disk so that pagecache is mostly populated and page
>>>> reclaiming is active. So, kswapd is no doubt using CPU time gradually,
>>>> nothing extraordinary.
>>>>
>>>> When I sent my reply yesterday, the server uptime was 12 days, and
>>>> kswapd had accumulated 4:28 CPU time. Now, approx 24 hours later (13
>>>> days uptime):
>>>>
>>>> root        23  0.0  0.0      0     0 ?        S    Mar30 4:52
>>>> [kswapd0]
>>>>
>>>> I will apply your v3 series soon and see if there's any improvement 
>>>> wrt
>>>> CPU usage, although as I said I don't see that as a big issue. It's
>>>> still only 0.013% of available CPU resources (dual core CPU).
>>>>
>>>
>>> JFTR, v3 kswapd uses about 15% more CPU time than v2. 2:50 kswapd CPU
>>> time after 6 days 14h uptime.
>>>
>>> And find attached another debugging graph that shows how ANON pages
>>> are privileged in the ZONE_NORMAL on a 4GB machine. Take notice that
>>> the number of pages in the ZONE_DMA32 is scaled (/5) to fit the graph
>>> nicely.
>>>
>>
>> Could you tell me how you draw this picture?
>>
>
> It's a home made server monitoring system. I just added the code 
> needed to graph the size of active + inactive LRU lists, per zone and 
> per type. Check out http://oss.oetiker.ch/rrdtool/

Thanks Zlatko, I successfully install, could you tell me your options?


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