[PATCH] powerpc: Keep track of emulated instructions

[Geert Uytterhoeven]

On Fri, 3 Apr 2009, Kumar Gala wrote:
> On Apr 3, 2009, at 7:08 AM, Geert Uytterhoeven wrote:
> >Finally (after ca. 1.5 years), he're an updated version of my patch to keep
> >track of emulated instructions.  In the light of Kumar's `Emulate enough of
> >SPE
> >instructions to make gcc happy' patch, he probably also wants to keep track
> >of
> >the actual runtime overhead.
> >
> >Changes since last version:
> > - arch/powerpc/kernel/sysfs.c is now compiled on ppc32, so we can provide
> >   counters in sysfs on ppc32, too,
> > - WARN_EMULATED() is a no-op if CONFIG_SYSCTL is disabled,
> > - Add warnings for altivec,
> > - Add warnings for recently introduced emulation of vsx and isel
> >   instructions.
> 
> pretty cool.  Do we think counters should be sysfs or debugfs?

What do you prefer?

On MIPS, unaligned exception handling control is in debugfs.

> Also it would be nice to be able to zero out the counters.

By writing to the individual counters, or by writing to a global `clear' file?

BTW, should the individual counters be readable by everybody? Currently they're
readable by root only.

With kind regards,

Geert Uytterhoeven
Software Architect

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