On Thu, Jun 25, 2009 at 6:58 PM, sandeep lahane<sandeep.lahane@xxxxxxxxx> wrote: > Hi All, > > Is it possible to access cpu performance counters from user space? > AFAIK, it is not possible. yes, impossible...because u need ring 0 to access these counter. For some more info: http://www.scl.ameslab.gov/Projects/Rabbit/menu.html#download and this one (irrelevant to linux kernel, but it shows how other kernel are doing it.....all have to be ring0): http://www.opensolaris.org/os/project/intel-platform/CPC/ > I am aware of various attempts like perfmon and perfctr patch set. > Looks like a kernel module is > mandatory to access these registers. My objective is to measure > various parameters like number > instructions retired, number of cache misses, number of brach mis > predictions etc. > > I know of an alternative way to count the number of instructions by > using ptrace but I think this approach > is very slow. > > Regards, > Sandeep. > -- > To unsubscribe from this list: send the line "unsubscribe linux-newbie" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.linux-learn.org/faqs > -- Regards, Peter Teoh -- To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs
