linux-kernel - Re: Inlined functions in perf report

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Date:   Tue, 20 Dec 2016 15:03:40 +0100
From:   Milian Wolff <milian.wolff@...b.com>
To:     "Steinar H. Gunderson" <sgunderson@...foot.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: Inlined functions in perf report

On Tuesday, December 20, 2016 2:43:41 PM CET Steinar H. Gunderson wrote:
> On Tue, Dec 20, 2016 at 02:27:10PM +0100, Milian Wolff wrote:
> > It is not even possible with that, perf report is lacking the steps
> > required to add inline frames - it will only add "real" frames it gets
> > from either of the unwind libraries.
> > 
> > I have a WIP patch available for this functionality though, it can be
> > found
> > here (depends on libbfd, i.e. bfd_find_inliner_info):
> > 
> > https://github.com/milianw/linux/commit/
> > 71d031c9d679bfb4a4044226e8903dd80ea601b3
> 
> Thanks, I'll be sure to try it out. I assume this works only with -g dwarf?
> I.e., for non-graph runs, I will still get the bottom function only, not the
> inlined one.

There is no -g dwarf to my knowldge. There is only `perf record -g`, which is 
the framepointer based unwinding and that should also work. But I only really 
tested this WIP branch with `--call-graph dwarf` so far.

I'm not so sure whether I understand your sentence about "non-graph runs". It 
has nothing to do with `perf report -g graph` (yes, perf is confusing!).

You'll have to:

perf record [-g | --call-graph lbr | --call-graph dwarf ] (pick one)
perf report -g srcline (and anything else)

Cheers

-- 
Milian Wolff | milian.wolff@...b.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts
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