Re: Creating a per-task kernel space for kmap, user pagetables, et al

Christoph Hellwig
2002-03-20T21:51:07Z

On Wed, Mar 20, 2002 at 10:34:25PM +0100, Andrea Arcangeli wrote:
> > The problem is not the 4GB ZONE_NORMAL but the ~1GB KVA space.
>
> Then you misunderstood what's the zone-normal, the zone normal is 800M
> in size not 4GB.

No, it was braino when writing.

> The 1GB of KVA is what constraint the size of the zone
> normal to 800M. We're talking about the same thing, just looking at it
> from different point of views.

Okay agreed now after the 'reminder'.

> > UnixWare/OpenUnix had huge problems getting all kernel structs for managing
> > 16GB virtual into that - on the other hand their struct page is more
> > then twice as big as ours..
>
> We do pretty well with pte-highmem, there is some other bit that will be
> better to optimize, but nothing major.

One major area to optimize are the kernel stacks I think.