[PATCH 0 of 2] Two small UI tweaks to perf

[Marti Raudsepp]

Hi!

Posting two small user interface tweaks to perf.

[PATCH 1 of 2] perf tools: notify user when unrecognized event is specified

When you specify an unknown --event, perf now outputs:

  invalid or unsupported event: 'foobar'
  Run 'perf list' for a list of valid events

[PATCH 2 of 2] perf tools: output 'perf list' to stdout not stderr

I certainly expected 'perf list' output to be sent to stdout. It's not errors
or notices: the user asked for a list.

Marti

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