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

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Message-Id: <20080906153855.7260.E1E9C6FF@jp.fujitsu.com>
Date:	Sat, 06 Sep 2008 16:06:38 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	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,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] [RESEND] x86_64: add memory hotremove config option

> > I am not sure if I understand why you appear to be opposed to
> > enabling the hotremove function before all the issues related
> 
> I'm quite sceptical that it can be ever made to work in a useful
> way for real hardware (as opposed to an hypervisor para virtual setup
> for which this interface is not the right way -- it should be done
> in some specific driver instead) 
> And if it cannot be made to work then it will be a false promise
> to the user. They will see it and think it will work, but it will
> not.
> 
> This means I don't see a real use case for this feature.

I don't think its driver is almighty.
IIRC, balloon driver can be cause of fragmentation for 24-7 system.

In addition, I have heard that memory hotplug would be useful for reducing
of power consumption of DIMM.

I have to admit that memory hotplug has many issues, but I would like to
solve them step by step.


Thanks.
-- 
Yasunori Goto 


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