On Nov 17, 2011, at 11:30 AM, Maynard Johnson wrote: >> >> Notice the first >> if (!cur_cpu_spec->oprofile_cpu_type) >> return -ENODEV; >> >> if (firmware_has_feature(FW_FEATURE_ISERIES)) >> return -ENODEV; >> For my e300c2 cpu both if's are false and I don't get support for >> callgraph/backtrace >> support. Moving the ops->backtrace = op_powerpc_backtrace; to the top >> enables backtrace for me. > What kernel version are you using? Actually, looking at a 3.0.3 tree I > happen to have available, I see oprofile h/w event support (in > arch/powerpc/kernel/cputable.c) for e300c3 and e300c4, but not the other e300 > flavors. I've added Andy Flemming from Freescale to cc. Maybe he knows why > e300c2 isn't supported.
e300c2 does not have hardware performance monitor events. However, it should be able to support timer-based profiling, right? And why not support backtrace from there? Do we require hardware counters to get a backtrace? Andy _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
