linux-kernel - Re: [PATCH 2/9] perf, tools: Add support for text descriptions of events and alias add

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Date:	Mon, 9 Jun 2014 18:52:45 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>, jolsa@...hat.com,
	linux-kernel@...r.kernel.org, acme@...radead.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/9] perf, tools: Add support for text descriptions of
 events and alias add

> Hmm.. this will print the description at right side and I think it'd be
> better if it prints in another line(s) like below:

I think it's better to show the descriptions by default without 
an extra option. I suspect most people want to see them, or if they
need them they won't know about obscure -v options.

> 
>   agu_bypass_cancel.count                            [Kernel PMU event]
>         This event counts executed load operations with all the following
>          traits: 1. addressing of the format [base + offset], 2. the offset
>          is between 1 and 2047, 3. the address specified in the base register
>          is in one page and the address [base+offset] is in an

The problem with this format is that it is not compatible, so it would
break existing parsers that look at perf list output.  That is why I ended up
with the right side format.


>   arith.fpu_div                                      [Kernel PMU event]
>         Divide operations executed
>   arith.fpu_div_active                               [Kernel PMU event]
>         Cycles when divider is busy executing divide operations
>   ...
> 
> 
> I just tweaked it using -v option for perf list.  Below is the change I
> made on top of your series.  What do you think?

I prefer not to apply that patch.

I guess what could make sense is a quiet option to not print
descriptions.

-Andi
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