Gregg: Linux Kernel Performance: Flame Graphs

Brendan Gregg demonstrates "flame graphs" as a tool for tracking down kernel performance problems. "The perf report tree (and the ncurses navigator) do an excellent job at presenting this information as text. However, with text there are limitations. The output often does not fit in one screen (you could say it doesn’t need to, if the bulk of the samples are identified on the first page). Also, identifying the hottest code paths requires reading the percentages. With the flame graph, all the data is on screen at once, and the hottest code-paths are immediately obvious as the widest functions." The flame graph code is hosted on Github.

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