linux-kernel - Re: PEBS level 2/3 breaks dwarf unwinding! [WAS: Re: Broken dwarf unwinding

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Message-ID: <20181109005535.GA6218@tassilo.jf.intel.com>
Date:   Thu, 8 Nov 2018 16:55:35 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Milian Wolff <milian.wolff@...b.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        Jiri Olsa <jolsa@...nel.org>, namhyung@...nel.org,
        linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho <acme@...nel.org>
Subject: Re: PEBS level 2/3 breaks dwarf unwinding! [WAS: Re: Broken dwarf
 unwinding - wrong stack pointer register value?]

> 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