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

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 01:12, venerdì 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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