Pretty cool seeing people actually care so much about profiling tools. You think we ever get one tool that really covers enough to keep everyone happy?
Flamegraphs are neat but the call graph in Luke Stackwalker[0] was more immediately obvious to me (especially since it draws a thick red line for the hottest path) than them.
Another approach is one i used for a profiler i wrote some time ago (and want to port to Linux at some point)[1] which displays the hottest "traces" (i.e. callstacks). One neat aspect of this is that you can merge multiple traces using a single function as the "head" (so, e.g., if there are two separate traces that contain a function "Foo" somewhere, you can select to use "Foo" as the starting point and they'll be treated as the same trace with their hitcounts combined).
