Date: Wed, 20 Feb 2008 18:24:19 +0900
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: "minchan Kim" <barrioskmc@gmail.com>
Subject: Re: [RFC][PATCH] the proposal of improve page reclaim by throttle
Cc: kosaki.motohiro@jp.fujitsu.com,
       "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>,
       "Balbir Singh" <balbir@linux.vnet.ibm.com>,
       "Rik van Riel" <riel@redhat.com>,
       "Lee Schermerhorn" <Lee.Schermerhorn@hp.com>, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org
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References: <20080219134715.7E90.KOSAKI.MOTOHIRO@jp.fujitsu.com> <44c63dc40802200056va847417v1cfc847341bb8cc0@mail.gmail.com>
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Hi Kim-san

Do you adjust hackbench parameter?
my parameter adjust my test machine(8GB mem),
if unchanged, maybe doesn't works it because lack memory.

> I am a many interested in your patch. so I want to test it with exact
> same method as you did.
> I will test it in embedded environment(ARM 920T, 32M ram) and my
> desktop machine.(Core2Duo 2.2G, 2G ram)

Hm
I don't have embedded test machine.
but I can desktop.
I will test it about weekend.
if you don't mind, could you please send me .config file
and tell me your test kernel version?

Thanks, interesting report.


> I guess this patch won't be efficient in embedded environment.
> Since many embedded board just have one processor and don't have any
> swap device.

reclaim conflict rarely happened on UP.
thus, my patch expect no improvement.

but (of course) I will fix regression.

> So, How do I evaluate following field as you did ?
> 
>  * elapse (what do you mean it ??)
>  * major fault

/usr/bin/time command output that.


>  * max parallel reclaim tasks:
>  *  max consumption time of
>         try_to_free_pages():

sorry, I inserted debug code to my patch at that time.


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