Re: Does ZONE_HIGHMEM exist on machines with 1G memeory

[Ronghua Zhang]

But why cannot we simply map the whole physical memory into the 1GB
kernel virtual address space? In this case, we don't need to reserve any
address space for the permanent or temporary mapping. Am I missing
something here? Thanks

RZ

On Wed, 22 Sep 2004, Robert Love wrote:

> On Tue, 2004-09-21 at 23:09 -0400, Ronghua Zhang wrote:
>
> >   This may be a dumb question. But it seems to me that when the machine
> > has 1GB memory, it can be mapped to the 1GB kernel virtual address space.
> > Do we still need ZONE_HIGHMEM in this case? Please CC any follow-up to me.
> > Thanks
>
> Highmem is actually everything above 896MB ... so, yes, you need
> ZONE_HIGHMEM.
>
> 	Robert Love
>
>
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