Messages in this thread | | | Date | Mon, 7 Nov 2005 13:20:09 +0100 | From | Ingo Molnar <> | Subject | Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19 |
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* Dave Hansen <haveblue@us.ibm.com> wrote:
> On Mon, 2005-11-07 at 09:00 +0100, Ingo Molnar wrote: > > * Linus Torvalds <torvalds@osdl.org> 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.
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