I am looking for a GUI tool for perf events in Linux? https://perf.wiki.kernel.org/index.php/Main_Page
This would be akin to kcachegrind for callgrind.
I know that Intel VTune could do this, but I was hoping for something open source.
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I suggest you try Zoom. On systems that support it, it uses Perf as a backend. The results in
butterfly profile view are very similar to those displayed by Perf ncurses 'GUI' (except that you get callees on top of callers) or Callgrind. Not open source, though.