Re: [Xen-ia64-devel] RE: PATCH: PAL_VM_SUMMARY and PAL_VM_INFO

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Jeudi 06 Avril 2006 18:30, Magenheimer, Dan (HP Labs Fort Collins) a écrit 
:
> > this patch implements PAL_VM_SUMMARY and PAL_VM_INFO using
> > Xen parameters.
> >
> > Tested by boot+halt of dom0+domU and read of /proc/pal/cpu0/vm_info.
> >
> > Tristan.
>
> I don't know that it is safe to describe the number of tc's
> as == 1, since Xen's VHPT is essentially a virtual TLB.
Good point.
But VHPT is only hint.
I propose a two levels TC hierarchy:
First level describes VHPT: 1 way, 64 sets.  I am not sure about 64 sets, but 
again it is difficult to get the right value.
Second level descrives dtlb/itlb: 1 way, 1 set.

If you don't agree, please suggest values.  I will be happy to use them :-)

> max_pkr should probably be zero for now (at least non-VT) since
> pkr's are not implemented.  Or would this be an "illegal" value
> because of architectural definition.
[Objection withdrawned]

> Why is impl_va_msb 50?
This is the smallest value allowed by SDM.
Which number do you prefer ?

> None of these are important but if we are going to implement
> these at all, we should probably get them "right" as eventually
> some OS or application will use them.
I agree.  I have somewhat picked a few values.
But it is difficult to tell the truth and lying :-)

Tristan.


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