Re: [RFC] pearing off zone from physical memory layout [0/10]

[Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

Christoph Lameter wrote:
> On Fri, 3 Feb 2006, KAMEZAWA Hiroyuki wrote:
> 
>> By this, zone's meaning will be changed from "a range of memory to be used
>> in a same manner" to "a group of memory to be used in a same manner".
> 
> For us on IA64 a zone describes the memory of a node in a NUMA system. 
> This is due to our IA64 not having memory issues like restricted DMA 
> areas or not directly addressable memory.
> 
> That memory is to be used in the same manner. Yes. So in principle this 
> would also work for us. I'd like to have an option though to get rid of 
> all the extra zones if one has a clean memory architecture. We still carry 
> the DMA and HIGHMEM stuff around without purpose.
> 
Unfortunately, some of ia64 machines has DMA zone (for support 32bit bus < 4G mem).
But yes, HIGHMEM is not necessary.

> Would this also mean that one can dynamically add/remove memory to a zone 
> if the memory has to be treated the same way?
> 
Yes, I think so.  When support buddy-system, it can be done by MAX_ORDER size.
One of my purpose is to add memory to NORMAL if necessary.
(removing looks difficult ?)

Thanks,
-- Kame

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