Comment 8 for bug 1648280

Ouch, malloc. That's about as long as my average callback duration.

              libsystem_kernel.dylib`madvise+0xa
              libsystem_malloc.dylib`malloc_zone_malloc+0x47
              libsystem_malloc.dylib`malloc+0x2a
              libc++.1.dylib`operator new(unsigned long)+0x1e
              QtCore`QMetaObject::activate(QObject*, QMetaObject const*, int, void**)+0x4d1
              mixxx`ControlDoublePrivate::valueChanged(double, QObject*)+0x4a
              mixxx`ControlDoublePrivate::set(double, QObject*)+0x8e
              mixxx`EngineVuMeter::process(float*, int)+0x1e7
              mixxx`EngineMaster::process(int)+0xaeb
              mixxx`SoundDevicePortAudio::callbackProcessClkRef(unsigned int, float*, float const*, PaStreamCallbackTimeInfo const*, unsigned long)+0x661
              mixxx`(anonymous namespace)::paV19CallbackClkRef(void const*, void*, unsigned long, PaStreamCallbackTimeInfo const*, unsigned long, void*)+0x23
              libportaudio.2.dylib`AdaptingOutputOnlyProcess+0xe7
              libportaudio.2.dylib`PaUtil_EndBufferProcessing+0x1c4
              libportaudio.2.dylib`AudioIOProc+0x392
              CoreAudio`AUConverterBase::RenderBus(unsigned int&, AudioTimeStamp const&, unsigned int, unsigned int)+0x2c5
              CoreAudio`AUBase::DoRenderBus(unsigned int&, AudioTimeStamp const&, unsigned int, AUOutputElement*, unsigned int, AudioBufferList&)+0x9a
              CoreAudio`AUBase::DoRender(unsigned int&, AudioTimeStamp const&, unsigned int, unsigned int, AudioBufferList&)+0x1f8
              CoreAudio`AUHAL::AUIOProc(unsigned int, AudioTimeStamp const*, AudioBufferList const*, AudioTimeStamp const*, AudioBufferList*, AudioTimeStamp const*, void*)+0x6f2
              CoreAudio`HALC_ProxyIOContext::IOWorkLoop()+0x9e7
              CoreAudio`HALC_ProxyIOContext::IOThreadEntry(void*)+0x58
  syscall duration ns
           value ------------- Distribution ------------- count
           32768 | 0
           65536 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1
          131072 | 0