D9823: Optimize: use QMetaObject::invokeMethod with functor

[Milian Wolff]

mwolff created this revision.
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REVISION SUMMARY
  When using this method with a string argument, the method would need
  to be queried every time via QMetaObject::indexOfMethod. Using a
  functor one can get rid of this, saving a few cycles which can
  add up when handling many inotify events.
  
  Note that the benchmark timing does not really improve significantly.
  Using a profiler like perf, we do see that less cycles are consumed
  though. In my measurement, this reduces the cpu cyles by about 2%.

REPOSITORY
  R244 KCoreAddons

REVISION DETAIL
  https://phabricator.kde.org/D9823

AFFECTED FILES
  src/lib/io/kdirwatch.cpp

To: mwolff, dfaure
Cc: #frameworks
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