linux-kernel - Re: Does Linux have plan to support memory hole remapping?

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Message-Id: <1207787687.30698.97.camel@localhost>
Date:	Thu, 10 Apr 2008 02:34:47 +0200
From:	Kasper Sandberg <lkml@...anurb.dk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Matti Aarnio <matti.aarnio@...iler.org>,
	Zhao Forrest <forrest.zhao@...il.com>,
	Andi Kleen <andi@...stfloor.org>, discuss@...-64.org,
	linux-kernel@...r.kernel.org, yhlu.kernel@...il.com, ak@...e.de
Subject: Re: Does Linux have plan to support memory hole remapping?

On Wed, 2008-04-09 at 10:54 +0200, Ingo Molnar wrote:
[..]
> 
> having said that - but we'll still consider sane looking patches that 
> allow the remapping of otherwise inactive RAM. [ We might not even have 
> to touch the system chipset beyond what Linux already knows about it: in 
A somewhat related question is.. How come linux does not(as i understand
it) support talking to the chipsets to do these things? wouldnt this
also give other benefits, such as being able to more precisely control
interrupts and stuff?

> theory someone might want to try a hack to GART remap such RAM areas and 
> use a sparse mem map entry to map it to Linux - if the identity of that 
> RAM is crystal-clear and there's enough GART space available. But even 
> then it's probably still at best a dangerous and fragile hack. ]
> 
> 	Ingo
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