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 <dingtianh...@huawei.com> 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 >> >>> Ok, I will check it and then decide the next step, thanks for your feedback. >>> >>> Regards >>> Ding >>> >> >> >> >> ------------------------------------------------------------------------------ >> "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE >> Instantly run your Selenium tests across 300+ browser/OS combos. Get >> unparalleled scalability from the best Selenium testing platform available. >> Simple to use. Nothing to install. Get started now for free." >> http://p.sf.net/sfu/SauceLabs >> _______________________________________________ >> oprofile-list mailing list >> oprofile-l...@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/oprofile-list >> > > > . > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/