Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19

[Ingo Molnar]

* Dave Hansen <haveblue@xxxxxxxxxx> wrote:

> On Mon, 2005-11-07 at 09:00 +0100, Ingo Molnar wrote:
> > * Linus Torvalds <torvalds@xxxxxxxx> wrote:
> > > So remappable kernels are certainly doable, they just have more 
> > > fundamental problems than remappable user space _ever_ has. Both from 
> > > a performance and from a complexity angle.
> > 
> > furthermore, it doesnt bring us any closer to removable RAM. The problem 
> > is still unsolvable (due to the 'how to do you find live pointers to fix 
> > up' issue), even if the full kernel VM is 'mapped' at 4K granularity.
> 
> I'm not sure I understand.  If you're remapping, why do you have to 
> find live and fix up live pointers?  Are you talking about things that 
> require fixed _physical_ addresses?

RAM removal, not RAM replacement. I explained all the variants in an 
earlier email in this thread. "extending RAM" is relatively easy.  
"replacing RAM" while doable, is probably undesirable. "removing RAM" 
impossible.

	Ingo
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