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SubjectRe: [RFC 0/4] perf tool: Adding ratios support
On Wed, Jan 16, 2013 at 9:25 AM, Jiri Olsa <jolsa@redhat.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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