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From: kamezawa.hiroyu@jp.fujitsu.com
To: kamezawa.hiroyu@jp.fujitsu.com
Cc: Ingo Molnar <mingo@elte.hu>,
	Yasunori Goto <y-goto@jp.fujitsu.com>,
	Andi Kleen <andi@firstfloor.org>, Gary Hade <garyhade@us.ibm.com>,
	linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
	Badari Pulavarty <pbadari@us.ibm.com>, Mel Gorman <mel@csn.ul.ie>,
	Chris McDermott <lcm@us.ibm.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org
Subject: Re: Re: Re: [PATCH] [RESEND] x86_64: add memory hotremove config option
Date: Sun, 7 Sep 2008 01:05:42 +0900 (JST)	[thread overview]
Message-ID: <6693458.1220717142061.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <9031244.1220716855172.kamezawa.hiroyu@jp.fujitsu.com>

----- 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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      parent reply	other threads:[~2008-09-06 16:05 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-05 17:21 Gary Hade
2008-09-05 17:44 ` Ingo Molnar
2008-09-05 18:14   ` Badari Pulavarty
2008-09-05 18:17     ` Ingo Molnar
2008-09-08 21:52       ` [PATCH] Cleanup to make remove_memory() arch neutral Badari Pulavarty
2008-09-09  0:56         ` Andrew Morton
2008-09-09  1:14           ` Randy Dunlap
2008-09-09  1:21           ` Yasunori Goto
2008-09-09 15:12             ` Badari Pulavarty
2008-09-08 21:56       ` [PATCH] x86: add memory hotremove config option Badari Pulavarty
2008-09-05 18:04 ` [PATCH] [RESEND] x86_64: " Andi Kleen
2008-09-05 18:31   ` Badari Pulavarty
2008-09-05 18:54     ` Andi Kleen
2008-09-05 22:34       ` Badari Pulavarty
2008-09-05 19:53   ` Gary Hade
2008-09-05 20:04     ` Andi Kleen
2008-09-05 21:54       ` Gary Hade
2008-09-06  0:01         ` Andi Kleen
2008-09-06  7:06           ` Yasunori Goto
2008-09-06  8:53             ` Andi Kleen
2008-09-08  5:52               ` Nick Piggin
2008-09-08  9:36                 ` Andi Kleen
2008-09-08  9:46                   ` Nick Piggin
2008-09-08 10:30                     ` Andi Kleen
2008-09-08 11:19                       ` Nick Piggin
2008-09-08 11:30                         ` Andi Kleen
2008-09-08 13:48                           ` Nick Piggin
2008-09-06 14:33             ` Ingo Molnar
2008-09-06 16:00             ` kamezawa.hiroyu
2008-09-06 16:17               ` Ingo Molnar
2008-09-06 16:05             ` kamezawa.hiroyu [this message]

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