linux-kernel - Re: [PATCH] perf stat: Align CSV output for summary mode

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Date:   Tue, 16 Mar 2021 14:07:49 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH] perf stat: Align CSV output for summary mode

On Tue, Mar 16, 2021 at 02:07:12PM +0100, Jiri Olsa wrote:
> On Tue, Mar 16, 2021 at 03:29:00PM +0800, Jin Yao wrote:
> > perf-stat has supported the summary mode. But the summary
> > lines break the CSV output so it's hard for scripts to parse
> > the result.
> > 
> > Before:
> > 
> >   # perf stat -x, -I1000 --interval-count 1 --summary
> >        1.001323097,8013.48,msec,cpu-clock,8013483384,100.00,8.013,CPUs utilized
> >        1.001323097,270,,context-switches,8013513297,100.00,0.034,K/sec
> >        1.001323097,13,,cpu-migrations,8013530032,100.00,0.002,K/sec
> >        1.001323097,184,,page-faults,8013546992,100.00,0.023,K/sec
> >        1.001323097,20574191,,cycles,8013551506,100.00,0.003,GHz
> >        1.001323097,10562267,,instructions,8013564958,100.00,0.51,insn per cycle
> >        1.001323097,2019244,,branches,8013575673,100.00,0.252,M/sec
> >        1.001323097,106152,,branch-misses,8013585776,100.00,5.26,of all branches
> >   8013.48,msec,cpu-clock,8013483384,100.00,7.984,CPUs utilized
> >   270,,context-switches,8013513297,100.00,0.034,K/sec
> >   13,,cpu-migrations,8013530032,100.00,0.002,K/sec
> >   184,,page-faults,8013546992,100.00,0.023,K/sec
> >   20574191,,cycles,8013551506,100.00,0.003,GHz
> >   10562267,,instructions,8013564958,100.00,0.51,insn per cycle
> >   2019244,,branches,8013575673,100.00,0.252,M/sec
> >   106152,,branch-misses,8013585776,100.00,5.26,of all branches
> > 
> > The summary line loses the timestamp column, which breaks the
> > CVS output.
> > 
> > We add a column at the 'timestamp' position and it just says 'summary'
> > for the summary line.
> > 
> > After:
> > 
> >   # perf stat -x, -I1000 --interval-count 1 --summary
> 
> looks ok, but maybe make the option more related to CVS, like:
> 
>   --x-summary, --cvs-summary  ...? 
> 

and we'll need man page update for that

jirka