linux-kernel - Re: Inlined functions in perf report

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Date:   Tue, 20 Dec 2016 15:05:54 +0100
From:   Milian Wolff <milian.wolff@...b.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "Steinar H. Gunderson" <sgunderson@...foot.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Jiri Olsa <jolsa@...nel.org>,
        "Liang, Kan" <kan.liang@...el.com>,
        "Jin, Yao" <yao.jin@...ux.intel.com>
Subject: Re: Inlined functions in perf report

On Tuesday, December 20, 2016 10:54:50 AM CET Arnaldo Carvalho de Melo wrote:
> Em Tue, Dec 20, 2016 at 02:27:10PM +0100, Milian Wolff escreveu:
> > On Tuesday, December 20, 2016 1:17:55 PM CET Peter Zijlstra wrote:
> > > On Tue, Dec 20, 2016 at 12:59:54PM +0100, Steinar H. Gunderson wrote:
> > > > FWIW, this is with perf from 4.10 (git as of a few days ago) and GCC
> > > > 6.2.1.
> > > 
> > > OK, so it might be possible with: perf record -g --call-graph dwarf
> > > but that's fairly heavy on the overhead, it will dump the top-of-stack
> > > for each sample (8k default) and unwind using libunwind in userspace.
> > 
> > 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.
> 
> Have you guys looked at this:
> 
> http://lkml.kernel.org/r/1481121822-2537-1-git-send-email-yao.jin@linux.inte
> l.com

No, haven't seen it. Seems like I should have made my work public earlier to 
prevent the duplication of effort.

> I have to review it and maybe you will help me with that ;-)
> 
> I've CCed Jin Yao, the author of this series.

Great stuff Jin, I'll try to find some time to review this over the coming 
days, instead of trying to push my work further.

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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