> -----Original Message----- > From: Marc Zyngier [mailto:marc.zyngier@xxxxxxx] > Sent: Monday, November 05, 2012 4:04 PM > To: Sundaram, Senthilkumar > Cc: Jessica Allison; kvmarm@xxxxxxxxxxxxxxxxxxxxx > Subject: Re: Profiling > > 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. > [[ss]] I checked my dts file and there is no entry for PMU in it. So I guess it is lacking support for PMU hardware. Can you point me to a dts with PMU support? Please note that I am running on a VExp Fast Model > M. > -- > Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
