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Explain what tracepoint profiling sources are about. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Jeff Garzik <jeff@garzik.org> LKML-Reference: <1248856508.6987.3041.camel@twins> Signed-off-by: Ingo Molnar <mingo@elte.hu>