Re: Zone sizes with low memory

[Rene Herman <rene.herman@xxxxxxxxxxxx>]

On 28-04-08 16:18, Vaughn Clinton wrote:

> This is a good question because I'm not sure how different this would be 
> defined in an x86_64 environment.  If someone does answer this can they 
> include the explaination for the x86_64 as well as the x86 please.

Highmem does not exist on it so all memory is in ZONE_NORMAL. ZONE_DMA does 
still exists for LPC (ISA in disguise) devices and a DMA32 zone exists for 
devices with 32-bit DMA restrictions.

With respect to address-space layout, check Documentation/x86-64/mm.txt.

Also note from that map that a difference from 32-bit is the fixed kernel 
image mapping at the end of the address-space. On 32-bit, it's just where 
you load it as I said for 32-bit.

I'm not very up on 64-bit, but those would be the/some 64-bit specific 
points. No highmem is ofcourse the important one.

Rene.

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