On Wed, Dec 19, 2012 at 11:17:53PM +0800, Storm Wang wrote: > >Currently counters that need extra regs are not supported by KVM PMU > >emulation > Thank you, Gleb. But actually only 1% chance, I got the LLC-loads > count nonzero, I really have no idea why this happend. > May be without configuring MSR_OFFCORE_RSP_0 the counter still counts something.
> On Wed, Dec 19, 2012 at 8:49 PM, Gleb Natapov <[email protected]> wrote: > > 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. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
