linux-kernel - Re: [PATCH v2] perf stat: Align CSV output for summary mode

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Message-ID: <YFNSjP4LKnixkQWq@kernel.org>
Date:   Thu, 18 Mar 2021 10:15:56 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     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 v2] perf stat: Align CSV output for summary mode

Em Wed, Mar 17, 2021 at 02:51:42PM -0700, Andi Kleen escreveu:
> > If you care about not breaking existing scripts, then the output they
> > get with what they use as command line options must continue to produce
> > the same output.
> 
> It's not clear there are any useful ones (except for tools that handle
> both). It's really hard to parse the previous mess. It's simply not
> valid CSV.
> 
> That's why I'm arguing that keeping compatibility is not useful here.
> 
> We would be stuck with the broken mess as default forever.

Fair enough, lets fix the default then. Jin, can you please consider
adding a 'perf test' shell entry to parse the CSV mode with/without that
summary? This way we'll notice when the new normal gets broken.

- Arnaldo