On Wed, Dec 19, 2012 at 02:08:07AM +0800, Storm Wang wrote:
> Hello guys
>
> here I have a problem, when I used perf in Guest, the count of LLC-loads
> usually returns 0. LLC-loads was a hardware cache event, besides the
> setting of general PMU MSR, need to set MSR_OFFCORE_RSP_0 as well, in perf,
> it would be the extra_reg and extra_config in "hw_perf_event". I add some
> debuginfo in function "read_pmc" and found that when measuring LLC-loads,
> pmc->perf_event->hw.extra_reg is 0x0, and the counter's number was always
> the same. I think this is the reason, but I can't find when and where the
> value changed.
>
> Anybody has some idea for this?
>
Currently counters that need extra regs are not supported by KVM PMU
emulation.
--
Gleb.
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