[PATCH v3] powerpc: Keep track of emulated instructions if debugfs is enabled

[Michael Ellerman]

On Fri, 2009-05-08 at 16:15 +0200, Geert Uytterhoeven wrote:
> Counters for the various classes of emulated instructions are available under
> /sys/kernel/debug/powerpc/emulated_instructions (assumed debugfs is mounted on
> /sys/kernel/debug).  Optionally (controlled by
> /sys/kernel/debug/powerpc/emulated_instructions/do_warn), rate-limited warnings
> can be printed to the console when instructions are emulated.
> 
> Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven at sonycom.com>
> ---
> Tested on ppc64 (ps3) and ppc32 (sequoia) using mfpvr.
> 
> v3:
>   - add generic unaligned
>   - switch from sysfs + sysctl to debugfs. All virtual files now show up under
>     /sys/kernel/debug/powerpc/emulated_instructions (assumed debugfs mounted on
>     /sys/kernel/debug)
>   - enable the printing of rate-limited warnings by writing a non-zero value to
>     /sys/kernel/debug/powerpc/emulated_instructions/do_warn
>   - switch from per-CPU to system-wide counters
>   - always use 32-bit counters (was 64-bit on ppc64)
>   - counters are writable, i.e. can be reset (by root)

Nice :)

My only query is whether it needs its own CONFIG option. Some folks
might want other DEBUG_FS things but not this?

cheers

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