On Tue, 9 Jul 2013, Peter Zijlstra wrote: > On Mon, Jul 08, 2013 at 10:24:34PM -0400, Vince Weaver wrote: > > > > So something like they have on ARM? > > > > vince@pandaboard:/sys/bus/event_source/devices$ ls -l > > lrwxrwxrwx 1 root root 0 Jul 8 21:57 ARMv7 Cortex-A9 -> > > ../../../devices/ARMv7 Cortex-A9 > > lrwxrwxrwx 1 root root 0 Jul 8 21:57 breakpoint -> > > ../../../devices/breakpoint > > lrwxrwxrwx 1 root root 0 Jul 8 21:57 software -> ../../../devices/software > > lrwxrwxrwx 1 root root 0 Jul 8 21:57 tracepoint -> > > ../../../devices/tracepoint > > Right so what I remember of the ARM case is that their /proc/cpuinfo isn't > sufficient to identify their PMU. And they don't have a cpuid like instruction > at all.
libpfm4 uses the CPU part : 0xc09 line in /proc/cpuinfo on ARM, and that's enough for the processors PAPI supports (Cortex A8/A9/A15 plus the 1176 on the raspberry-pi). I'm guessing it wouldn't be enough if we wanted to support *all* ARMs with PMUs. And speaking of ARM, I should be railing at them for breaking the ABI too, with their (understandable yet still ABI breaking) decision to remove BogoMIPS from /proc/cpuinfo. That change will impact PAPI as well as various other programs I maintain that have the misfortune of parsing that file. Vince _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
