linux-kernel - Re: [RFC 0/4] perf tool: Adding ratios support

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Date:	Wed, 16 Jan 2013 10:12:14 -0500
From:	Ulrich Drepper <drepper@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andi Kleen <andi@...stfloor.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [RFC 0/4] perf tool: Adding ratios support

On Wed, Jan 16, 2013 at 9:25 AM, Jiri Olsa <jolsa@...hat.com> wrote:
> I was thinking having config files (global and arch specific)
> comming with perf having predefined formulas.

All the more reason to not mention the file name or really any source
for the definition of the formula in the name,


> 1)  -e 'ratio/branch-rate/'  # special event class
> 2)  -e 'ratio-branch-rate'   # 'ratio-' prefix
> 3)  -e cpu/branch-rate/      # handled like aliases, ratio name would need to be unique
>   ... ?

I think 3 is the most extensible.  Perhaps use the syntax used in
other places.  We have these :u suffixes etc.  Perhaps have :r or :R
or whatever.

Given the other comments, we might want to avoid right away "ratio".
If the mechanism is generalized it could be used to express "counter1
- counter2" for events which cannot be expressed with a single counter
but are not really ratios.
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