The self-count example does not work. The support for remapped
counter does not quite work on X86. There is more than CR4 to
fix.
2011/11/18 explore_zjx <explore_...@126.com>:
> Hello,everyone!
> I installed libpfm4 on my platform. The cpu is Q6600 and the OS is RHEL
> with 2.6.34 kernel.
> I hit seg faults trying to run perf_examples/self_count.c in libpfm4,
> and all Google can find is that kernel support for user-level rdpmc was
> missing.
> To enable the rdpmc instrction, I wrote a program to set the PCE bit of
> cr4.
> Then I recompiled the self_count.c example,it runs normally when I
> just monitor one event.
> I means that I can only enable one event one time in the variable
> *gen_events.
>
> static const char *gen_events[]={
> //"CPU_CLK_UNHALTED",
> //"INST_RETIRED",
> "MEM_LOAD_RETIRED:L2_MISS",
> NULL
> };
> Once I set up two events or more simultaneously, such as
> CPU_CLK_UNHALTED and MEM_LOAD_RETIRED:L2_MISS, the self_count can be
> executed, but the read result of PMU counter is wrong. The result of
> CPU_CLK_UNHALTED is always zero, while the other seems normal.
> So my question is that could I set up more events than one when I using
> rdpmc instruction.
>
> I want to use rdpmc instruction because I want to reduce the overhead of
> read PMU as much as possible. Would u like to give me another advice?
> Thanks in advance!
>
> Jason
> 2011/11/18
>
>
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security threats, fraudulent activity, and more. Splunk takes this
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