Issues with @perf directives in systemtap 3.1 on Ubuntu 16.04LTS

[Stan Cox]

> Does @perf not work with library functions?
The attached perf library example seems to work fine on Fedora.
  ABCDEFGHIJKLMNOPQRSTUVWXYZ
  count 1 min 882141 max 882141
  ABCDEFGHIJKLMNOPQRSTUVWXYZ
  ...
  count 100 min 888775 max 1594700



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