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

[Ulrich Drepper]

On Wed, Jan 16, 2013 at 9:25 AM, Jiri Olsa <jolsa@xxxxxxxxxx> 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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/