linux-kernel - Re: [PATCH] perf report: Add a tip about source line numbers with overhead

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Date:   Thu, 29 Sep 2016 19:30:20 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Kim SeonYoung <adamas0414@...il.com>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Taeung Song <taeung@...slab.kr>
Subject: Re: [PATCH] perf report: Add a tip about  source line numbers with
 overhead

Em Thu, Sep 29, 2016 at 03:00:33PM -0700, Kim SeonYoung escreveu:
> There is a existing tip as below.
> 
>     If you have debuginfo enabled, try: perf report -s sym,srcline
> 
> However this tip only describe a condition to use --sort sym,scrline options.
> So there is lack of explanation in the tip. I think that it would be better to
> add a tip that exactly explain the feature of --sort srcline.
> 
> Signed-off-by: Seonyoung Kim <adamas0414@...il.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Taeung Song <taeung@...slab.kr>
> ---
>  tools/perf/Documentation/tips.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/Documentation/tips.txt b/tools/perf/Documentation/tips.txt
> index 5950b5a..0d79eb1 100644
> --- a/tools/perf/Documentation/tips.txt
> +++ b/tools/perf/Documentation/tips.txt
> @@ -28,3 +28,4 @@ To change sampling frequency to 100 Hz: perf record -F 100
>  See assembly instructions with percentage: perf annotate <symbol>
>  If you prefer Intel style assembly, try: perf annotate -M intel
>  For hierarchical output, try: perf report --hierarchy
> +Show source files and line numbers in sequence of overhead, try: perf report -s srcline

Maybe:

Order by the overhead of source file name and line number: 'perf report -s srcline'

- Arnaldo