On Tue, May 07, 2013 at 08:48:05AM +0200, Ingo Molnar wrote: > Also, this code only runs when the event is set up, so a bit of sanity > checking can only help, right? Nah, its all very circumspect. In fact; while what Andi states is 'true': > documentation in the Intel SDM 18.6.1.1 states: > > """ > PEBS events are only valid when the following fields of IA32_PERFEVTSELx are all > zero: AnyThread, Edge, Invert, CMask. > """ It is also true that Intel themselves gave us events that contradict this; look at the intel_pebs_aliases*() functions. This patch would make it impossible to manually create those events. Further, there's something entirely different behind this. -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html