[RFC 5/6] perf/tools: Enhance JSON/metric infrastructure to handle "?"

[Andi Kleen]

On Fri, Jan 17, 2020 at 06:16:19PM +0530, Kajol Jain wrote:
> Patch enhances current metric infrastructure to handle "?" in the metric
> expression. The "?" can be use for parameters whose value not known while
> creating metric events and which can be replace later at runtime to
> the proper value. It also add flexibility to create multiple events out
> of single metric event added in json file.

Please add a proper specification how this ? thing is supposed to work,
what the exact semantics are, how it is different from the existing
# mechanism etc.

The standard way to do similar things before was to define an explicit
# name and let the expr code take care of it. 

-Andi