[PATCH 0/3] powerpc: Instrument Hypervisor Calls

[Luke Browning]

linuxppc-dev-bounces+lukebrowning=us.ibm.com at ozlabs.org wrote on 
07/16/2006 12:53:54 AM:

> On Sat, Jul 15, 2006 at 02:00:02AM +0200, Arnd Bergmann wrote:
> 
> > What happened to the question whether to use PURR values for also 
measuring
> > cycles spent executing the hcall as opposed to cycles that passed 
before
> > the hcall returns. Did that turn out not giving extra information 
after all
> > or was there a different reason to drop that idea?
> 
> Just so people don't forget: this can't be done on all processors. For
> example, PPC970 and POWER4 don't implement the PURR SPR. And it doesn't
> make sense to use H_PURR to get the software emulated ones there. Not
> really an issue on POWER4 since they don't do shared processor LPAR, but
> on JS21 I think they might do?
> 
Isn't there someway to do a platform specific processor overlay, where you 

get PURR if it exists and TB otherwise.

Luke
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