Re: [uml-devel] Configuration problem with UML in kernel 2.6.19.1

[Blaisorblade <blaisorblade@yahoo.it>]

On Wednesday 17 January 2007 18:15, Pravin wrote:
> Thanx  :-)
> Its working now.... :-)
>
> One more thing that I would like to tell here.
> I did used same compiled kernel on other machine which was having
> 2.6.17-1.2187_FC5.
> And that kernel 2.6.19 without your patch did worked fine....
>
> but same kernel 2.6.19 was not working on my machine which is Debian 
> 2.6.18. After applying your patch and changing the configuration to
> HOST_2G_2G its working fine now on my Debian machine 2.6.18.
>
> Can I know what excatly was the problem... ?

Usually the host kernel "gives"* a certain space (3G) to userspace apps. Some 
host kernels give less memory (say 2,75G, 2G, or even 1G) to userspace apps 
(these days, it depends on the CONFIG_VMSPLIT_* settings, before it could be 
tuned via external patches like -ck patchset or probably others).

Most application use the available memory, but UML, for now, needs to know 
that it can use a given amount - say 2G. It will run fine when more memory is 
available, but not when less memory is available.

At last, why different splits? While 3G is usual (normally named 3G/1G), on a 
host with 1G of RAM you either use HIGHMEM (with a little slowdown) or use a 
2,75G/1,25G split.

* This is "virtual address space", not a statical split assigning physical RAM 
to different purposes - but I won't go in the details here.

> My main objective is to run SELinux on UML kernel and test it.

Probably Antoine Martin is the one having more experience on UML+SELinux. This 
is his page on the argument:

http://uml.nagafix.co.uk/SELinux/

> Let me know if there is anything I can do to help here.
>
> On 1/17/07, Blaisorblade <blaisorblade@yahoo.it> wrote:
> > You mentioned trying to use CONFIG_HOST_VMSPLIT to solve a problem, that
> > is of little use without this applied, if you run UML in SKAS0 mode.
> >
> > ----------  Forwarded Message  ----------

-- 
Inform me of my mistakes, so I can add them to my list!
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale! 
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