linux-kernel - Re: [RFC][PATCH] the proposal of improve page reclaim by throttle

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Message-Id: <20080220181447.6444.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Wed, 20 Feb 2008 18:24:19 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"minchan Kim" <barrioskmc@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"Balbir Singh" <balbir@...ux.vnet.ibm.com>,
	"Rik van Riel" <riel@...hat.com>,
	"Lee Schermerhorn" <Lee.Schermerhorn@...com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] the proposal of improve page reclaim by throttle

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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