Re: [discuss] Re: 2.6.19-rc5: known regressions (v3)

[Andrew Morton]

On Wed, 15 Nov 2006 17:48:05 +0100
Andi Kleen <ak@xxxxxxx> wrote:

> 
> > OProfile has a simplistic view of the performance monitoring hardware. The 
> > routines in libop/op_alloc_counter.c determine what set of performance registers 
> > is available from the processor in use. There is no check to see what registers 
> > are actually available in the /dev/oprofile directory.
> > 
> > opcontrol executes ophelp to determine which specific counters to count which 
> > events. The function map_event_to_counter() in libop/op_alloc_counter.c does the 
> > actual selection. It seems what is needed is for map_event_to_counter() to check 
> > to see which counters are available and mark the others as unavailable
> 
> Thanks for the explanation. Can you please fix it and release a new version? 
> Documentation/Changes could be adapted then.
> 

Meanwhile we should restore the NMI counter to fix this bug.
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