On Wed, Nov 13, 2013 at 10:22:54PM -0500, Binh Q. Pham wrote: > Hi Gleb, > Thanks for the suggestion, but I just tried to specify the cpu type > to QEMU: -cpu host and I got the same output. > Which QEMU version are you using, what is the output of "cat /proc/cpuinfo" in the guest and attach guest's dmesg too. > Binh > On 11/13/2013 12:54 PM, Gleb Natapov wrote: > >On Wed, Nov 13, 2013 at 11:52:01AM -0500, Binh Q. Pham wrote: > >>Hi all, > >> > >>I just started using kvm and want to use linux 'perf' tool inside > >>the virtual machine to get some information about the hardware > >>performance counters. I noticed in kvm source, there is pmu.c and > >>pmu-stubs.c, so I assume they provide support for PMU. However, when > >>I ran 'perf stat' in the VM, all hardware events are not supported. > >>Sample screen shot: > >> > >>perf stat /bin/ls > >>Performance counter stats for '/bin/ls': > >><not supported> cycles > >><not supported> stalled-cycles-frontend > >>.... > >> > >>Could someone clarify for me if I can use 'perf' in VM with the > >>current kvm state? > >> > >You need to specify host cpu type to QEMU: -cpu host. > > > >-- > > Gleb. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
