a couple of other 'perf probe' suggestions:

i think the 'perf probe' UI should be streamlined.

Right now we have kprobes assumptions like this syntax:

  perf probe <kernel_symbol>

will add a probe.

That is nonsensical once we merge uprobes, as i'd expect much 
more developers to be interested in user-space symbols than 
kernel-space symbols.

So we could change this syntax and add the more intuitive:

  perf probe add ...
  perf probe del ...
  perf probe list

Variants. Also, the -x syntax isnt particularly intuitive either 
- it should be a 'perf probe add ...' variant.

If someone uses the old syntax it will produce a meaningful 
error message.

Thanks,

	Ingo

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