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

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Date:   Wed, 17 Mar 2021 08:51:23 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>, 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 3/17/2021 5:55 AM, Jiri Olsa wrote:
> 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
> 

Is it serious or just a joke? :)

Thanks
Jin Yao

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