Re: [uml-devel] highmem support in 2.4 (2.4.26-1)

[Trent Lloyd <lathiat@bur.st>]

In 2.6.6, with HIGHMEM support on my kernel fails to build

On Fri, Jun 25, 2004 at 07:46:17PM +0200, BlaisorBlade wrote:
> Alle 01:12, venerd? 25 giugno 2004, D. Bahi ha scritto:
> > hello UMLers
> >
> > i uml launch a guest with "mem=1024M"
> > and i see "CONFIG_HIGHMEM not enabled".
> > so i "make ARCH=um xconfig" to enable it
> > and rebuild.
> >
> > i no longer see "CONFIG_HIGHMEM not enabled"
> > but i still see "Memory: 460188k available"
> > which makes me think i'm missing something.
> 
> That support could be broken. I don't think you can have done anything wrong 
> (no configuration error possible; double-check that CONFIG_HIGHMEM = y in the 
> .config, but you cannot have missed anything else).
> 
> But there could be some strange host configuration: what is your distro? Have 
> you enabled exec-shield (which is enabled by default on Fedora and RedHat 9?
> 
> I think that the message could be wrong; could you check with the "free" 
> command inside the UML?
> 
> See the explainations:
> 
> > w/o CONFIG_HIGHMEM:
> 
> >CONFIG_HIGHMEM not enabled - physical memory shrunk to 499122176 bytes
> >Kernel virtual memory size shrunk to 32505856 bytes
> 
> > On node 0 totalpages: 121856
> > zone(0): 121856 pages.
> > zone(1): 0 pages.
> > zone(2): 0 pages.
> 
> I.e. there are some pages (each one is 4k) in the zone 0 (normal).
> 
> > Memory: 474328k available
> 
> 
> > w/ CONFIG_HIGHMEM:
> 
> > Kernel virtual memory size shrunk to 32 505 856 bytes
> 
> This is unrelated, but strange: is the kernel going to use just 32 Mega (in 
> both cases) for itself?
> 
> > On node 0 totalpages: 262144
> > zone(0): 121856 pages.
> > zone(1): 0 pages.
> > zone(2): 140288 pages.
> 
> I.e. there are those pages in the normal zone plus some more ones in the zone 
> 2, i.e. (IIRC) the HIGHMEM zone. So HIGHMEM seems to work, at least 
> partially.
> 
> > Memory: 460188k available
> 
> Bye
> -- 
> Paolo Giarrusso, aka Blaisorblade
> Linux registered user n. 292729
> 
> 
> 
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-- 
Trent Lloyd <lathiat@bur.st>
Bur.st Networking Inc.


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