[Tiny-tux] Fascinating LKML flame war

[Wladyslaw Zbikowski]

There is a pretty interesting thread brewing if you want to learn
about Linux tracing and performance analysis tools (and the
personalities behind them).

http://lkml.org/lkml/fancy/2011/5/6/289

Summary:

- Steve Rostedt writes Ftrace for tracing kernel events.
- Arjan van der Ven uses it in the PowerTOP userspace utility.
- Steve changes which events Ftrace reports, and PowerTOP breaks.
- Arjan reverts Steve's change.
- Linus Torvalds says any kernel change that breaks userspace is an ABI break.
- Steve says PowerTOP is broken for not parsing Ftrace output correctly.
- Ingo Molnar says everyone should be using perf anyway.
- Some guy from Google says they need Ftrace and if Ingo dumps it,
they will fork.
- Egos collide!