[PATCH 0/3] powerpc: Instrument Hypervisor Calls

[Mike Kravetz]

On Tue, Jul 18, 2006 at 08:36:18PM -0700, Mike Kravetz wrote:
> > My other comment is this: wouldn't it actually turn out simpler if we
> > read the timebase (and PURR, if we really want to do that too) in the
> > assembly code that implements plpar_hcall_*?
> 
> I'll give that a try.  My assembly skills are a bit rusty, so it may
> take a little longer to produce something.

Getting the timebase and PURR in assembly is easy enough.  So, I thought
about updating the per-cpu statistics while in there.  But, I couldn't
find any other assembly code that does this.  Sure there is asm code that
updated fields in the PACA, but none that messes with paca.data_offset
(that I could find).

Should the statistic updates also be done in the assembly routines?  Or,
how about a call out to a C routine for this?

-- 
Mike