On 04/11/12 09:12, Sundaram, Senthilkumar wrote: > Hi Mark, > > Sorry for the confusion. I was cherry-picking from the wrong branch. > > Now I am able to build perf support successfully after the following steps > > 1) Merging kvm-perf from your tree on to kvm-arm > 2) Then cherrypicking bff6c03618 commit from your tree again on to kvm-arm > 3) Enable CONFIG_HW_PERF_EVENTS in kernel config file > > Can you suggest how I should get the perf binaries ? I am running kvm-arm on a Fast Model with a minimal initrd filesystem and no networking support. So I need to package the perf along with my initrd filesystem. > > I used a statically linked perf for ARM that I downloaed from a google download site. It seems to work, but it is having permission issues when I try to collect HardwareEvents. > > It works fine for software events: > >> perf state -e cpu-clock ls >> > "works fine" > > > For Hardware events I get the following error > >> perf stat -e cycles ls >> No permission to collect stats. >> Consider tweaking /proc/sys/kernel/perf_event_paranoid > > I did modify perf_event_paranoid with value of -1 which is supposed to take care of any permission issues. > > So I am not sure if it is an issue with the perf binary that I downloaded or if it is due to some other issues accessing the hardware events counter. Can you check if your PMU hardware gets registered? You should see some messages in your kernel log, and have the corresponding device in your device-tree. M. -- Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
