[PATCH] powerpc: Keep track of emulated instructions
Geert.Uytterhoeven at sonycom.com
Mon Apr 6 22:33:24 EST 2009
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
> >instructions to make gcc happy' patch, he probably also wants to keep track
> >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,
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