Re: [PATCH 2/2] x86: UV hardware performance counter and topologyaccess

[Ingo Molnar]

* Russ Anderson <rja@xxxxxxx> wrote:

> Adds device named "/dev/uv_hwperf" that supports an ioctl interface
> to call down into BIOS to read/write memory mapped performance
> monitoring registers.

That's not acceptable - please integrate this with perf events properly. 
See arch/x86/kernel/cpu/perf_event.c for details.

Precisely what kinds of events are being exposed by the UV BIOS 
interface? Also, how does the BIOS get them? The BIOS should be left out 
of that - the PMU driver should know about and access hardware registers 
directly.

If any of this needs enhancements in kernel/perf_event.c we'll be glad 
to help out.

	Ingo
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