PerfView Callers is showing "Root", why?

Question

I'm trying to figure out a CPU performance problem using PerfView, my application is an Asp.Net Core 2.2 running on IIS. According to this video https://channel9.msdn.com/Series/PerfView-Tutorial/PerfView-Tutorial-2-A-Simple-CPU-Performance-Investigation the "Caller" is the main point to find the performance problem, but in my collections it's showing just a "ROOT" entry and it's not expandable, see:

Any help?

Tks

Answer 1

The view in your screenshot is showing "Methods that call module coreclr <<coreclr?>>" so as you expand the tree, it's showing you what called the current item. ROOT is the end of the line because nothing called that, which is why you can't expand beyond that.

The item above ROOT is the dotnet process that started your assembly.