[PATCH] powerpc: Keep track of emulated instructions
mikey at neuling.org
Tue Apr 7 08:43:58 EST 2009
In message <alpine.LRH.2.00.0904061430090.11076 at vixen.sonytel.be> you wrote:
> 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 k=
> > >track of emulated instructions. In the light of Kumar's `Emulate enough=
> > >SPE
> > >instructions to make gcc happy' patch, he probably also wants to keep tr=
> > >of
> > >the actual runtime overhead.
> > >
> > >Changes since last version:
> > > - arch/powerpc/kernel/sysfs.c is now compiled on ppc32, so we can provi=
> > > 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.
Would per process counters be too hard? Stick them in the thread_struct
and export them via /proc/<pid>/emulated.
> > 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' fi=
> BTW, should the individual counters be readable by everybody? Currently the=
> readable by root only.
> With kind regards,
> Geert Uytterhoeven
> Software Architect
> Sony Techsoft Centre Europe
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