Re: PEBS level 2/3 breaks dwarf unwinding! [WAS: Re: Broken dwarf unwinding - wrong stack pointer register value?]

[Andi Kleen]

> Can we change this, such that perf_event_output also takes a second set of 
> registers (iregs) that get sampled for PERF_SAMPLE_REGS_INTR? I'm very new to 
> real kernel development, what kind of ABI/API stability guarantees exist for 
> something like "perf_event_output"?

Yes you can change it.

That's no API/ABI stability guarantee for kernel internal functions, 
as long as you change all callers in tree.

-Andi