linux-kernel - Re: Re: Re: [PATCH] [RESEND] x86_64: add memory hotremove config option

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Message-ID: <6693458.1220717142061.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Sun, 7 Sep 2008 01:05:42 +0900 (JST)
From:	kamezawa.hiroyu@...fujitsu.com
To:	kamezawa.hiroyu@...fujitsu.com
Cc:	Ingo Molnar <mingo@...e.hu>, Yasunori Goto <y-goto@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Gary Hade <garyhade@...ibm.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Mel Gorman <mel@....ul.ie>, Chris McDermott <lcm@...ibm.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: Re: Re: [PATCH] [RESEND] x86_64: add memory hotremove config option

----- Original Message -----
>>Having said that, i have my doubts about its generic utility (the power 
>>saving aspects are likely not realizable - nobody really wants DIMMs to 
>>just sit there unused and the cost of dynamic migration is just 
>>horrendous) - but as long as it's opt-in there's no reason to limit the 
>>availability of an in-kernel feature artificially.
>
>Nobody ? maybe just a trade-off problem in user side. 
>Even without DIMM hotplug or DIMM's power save mode, making a DIMM idle
>is of no use ? I think memory consumes much power when it used.
>Memory Hotplug and ZONE_MOVABLE can make some memory idle.
>(I'm sorry if my thinking is wrong.)
>
But I have to point out HDD access consumes far power than memory.
That's trade-off problem depends on usage, anyway.

Thanks,
-Kame
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