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

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Date:   Tue, 16 Mar 2021 22:55:14 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jin Yao <yao.jin@...ux.intel.com>, jolsa@...nel.org,
        peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        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 01:02:20PM -0700, Andi Kleen wrote:
> On Tue, Mar 16, 2021 at 04:05:13PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Mar 16, 2021 at 09:34:21AM -0700, Andi Kleen escreveu:
> > > > looks ok, but maybe make the option more related to CVS, like:
> > > > 
> > > >   --x-summary, --cvs-summary  ...? 
> > > 
> > > Actually I don't think it should be a new option. I doubt
> > > anyone could parse the previous mess. So just make it default
> > > with -x
> > 
> > In these cases I always fear that people are already parsing that mess
> > by considering the summary lines to be the ones not starting with
> > spaces, and now we go on and change it to be "better" by prefixing it
> > with "summary" and... break existing scripts.
> 
> I think it was just one version or so?
> 
> FWIW perf has broken CSV output several times, I added workarounds
> to toplev every time. Having a broken version for a short time
> shouldn't be too bad.
> 
> I actually had a workaround for this one, but it can parse either way.
> 
> > 
> > Can we do this with a new option?
> > 
> > I.e. like --cvs-summary?
> 
> If you do it I would add an option for the old broken format
> --i-want-broken-csv. But not  require the option forever
> just to get sane output.

I like that.. also we'll find out how many people are actually parsing that ;-)

jirka

> 
> Or maybe only a perf config option.
> 
> -Andi
>