On 05/05/2014 04:04 AM, Ding Tianhong wrote: > On 2014/4/29 4:39, William Cohen wrote: >> On 04/27/2014 10:32 PM, Ding Tianhong wrote: >>> On 2014/4/26 18:22, Ding Tianhong wrote: >>>> On 2014/4/26 17:23, Catalin Marinas wrote: >>>>> On 26 Apr 2014, at 09:38, Ding Tianhong <[email protected]> wrote: >>>>>> Add OProfile support for arm64, using the perf backend, and failing back >>>>>> to generic timer based sampling if PMU interrupt is not supported. >>>>>> >>>>>> I have test this patch on Cortex-A53 and Cortex-A57 motherboard, the >>>>>> OProfile >>>>>> could work well by PMU irq or arch timer irq. >>>>> >>>>> This came up before a few times and we also had an implementation but >>>>> decided not to merge it. We should rather get the user space oprofile to >>>>> use the perf kernel API. >>>>> >>>>> That’s an old thread, it may have even made it into mainline oprofile >>>>> but I haven’t followed the development: >>>>> >>>>> http://marc.info/?l=oprofile-list&m=133002515616302&w=2 >>>>> >>>>> Catalin >>>>> >>> >>> Hi Cadtalin: >>> >>> Sorry I could not find the implementation that not to merge the orpfile >>> support for aarch64 till now, and >>> I still have questions that the existing code only support oprofile by arch >>> timer event, but not >>> PMU event, this patch only add HW PMU support for oprofile, it is more >>> accurate and stable, can you >>> give me more advise and appreciate for your help. >>> >>> Regards >>> Ding >> >> Hi Ding, >> >> There is some basic support for arm64 in oprofile using the kernel's perf >> infrastructure for the Applied Micro X-Gene processor checked into the >> upstream oprofile git repository: >> >> http://sourceforge.net/p/oprofile/oprofile/ci/34d0065a1a790fc2be05a5ef1d8b0bbf28b814fe/ >> >> It should be straight forward to adapt and extend this to work for A53 and >> A57 processors in libop/op_cpu_type.c. At the time I didn't have access to >> the cortex a57/a53 documentation so this was implemented for the the base >> ARMv8 PMUv3 events. The processor identification for Cortex a53 and a57 will >> also need to be added. to /libop/op_cpu_type.c. I don't currently have >> access to cortex a53 or a57 processors, so I don't know what the magic >> vendorid and cpuid values are. What is the output of "cat /proc/cpuinfo" for >> each of the aarch64 processors you are running oprofile on? >> >> -Will >> > > Hi Will: > > Sorry for feedback so late, too busy these days. :) > > Thanks for your message, you can add the the A53 and A57 to support arm-v8 > for oprofile. > > A53 A57 > Vendid 0x41 0x41 > cpuid 0xD03 0xD07 > > -Ding
Hi Ding, Thanks very much for the IDs for Cortex A53 and Cortex A57. -Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
