Re: [uml-user] tsc.c in UML

[Han <kee...@gm...>]

On Sat, Aug 24, 2013 at 6:42 AM, richard -rw- weinberger <
ric...@gm...> wrote:

> On Fri, Aug 23, 2013 at 8:35 PM, Han <kee...@gm...> wrote:
> > Hi,
> >
> > I am using Linux kernel 2.6.27 for building UML kernel.  It seems like
> > "arch/x86/kernel/tsc.c" is not built in and the symbol "cpu_khz" is not
> > available.
> >
> > My question is:  what's the reason that "tsc.c" not included in UML?  Is
> > there any config or simple way(patch?)  to include it in UML?
>
> Simply because UML has no TSC.
>


[Han]  I don't really understand why UML has no TSC.   As I know,  TSC is
accessible from user space process (on x86 at least) and I don't see any
obvious reason why UML does not support TSC.   I might missed something.

I am trying to add TSC into UML kernel (2.6.27)  for an experiment.   Is
that a practical thing to do at all?

thanks
Han


> > I have not tried the same on the newer kernels yet as my target system
> uses
> > 2.6.27 only so I prefer to stick with 2.6.27 if possible.
> >
> > thanks
> > Han
> >
> >
> >
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> --
> Thanks,
> //richard
>