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

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Message-ID: <20080908093619.GC26079@one.firstfloor.org>
Date:	Mon, 8 Sep 2008 11:36:19 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	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

> You use non-linear mappings for the kernel, so that kernel data is
> not tied to a specific physical address. AFAIK, that is the only way
> to really do it completely (like the fragmentation problem).

Even with that there are lots of issues, like keeping track of 
DMAs or handling executing kernel code.

> 
> Of course, I don't think that would be a good idea to do that in the
> forseeable future.

Agreed.

-Andi

-- 
ak@...ux.intel.com
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