[BUG] perf list: --help option not implemented

[Stephane Eranian]

Jiri,

When I run perf list, I see:

$ perf list
  ..
  rNNN                                               [Raw hardware
event descriptor]
  cpu/t1=v1[,t2=v2,t3 ...]/modifier                  [Raw hardware
event descriptor]
   (see 'perf list --help' on how to encode it)

But:
$ perf list --help
$

Shows nothing. Looked at the code and I don't see where you handle the --help
option. You need some help to figure out what the modifiers are.

Am I missing something here?
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