From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755066AbaEEIGU (ORCPT ); Mon, 5 May 2014 04:06:20 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:11018 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755019AbaEEIGQ (ORCPT ); Mon, 5 May 2014 04:06:16 -0400 Message-ID: <53674615.5000509@huawei.com> Date: Mon, 5 May 2014 16:04:37 +0800 From: Ding Tianhong User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.0.1 MIME-Version: 1.0 To: William Cohen , Catalin Marinas CC: Peter Zijlstra , Will Deacon , "linux-kernel@vger.kernel.org" , "huxinwei@huawei.com" , Ingo Molnar , Paul Mackerras , "Arnaldo Carvalho de Melo" , "oprofile-list@lists.sf.net" , Subject: Re: [PATCH] arm64: add OProfile support References: <535B707F.7020802@huawei.com> <58ED971B-CC04-4BE1-916C-386D219874A8@arm.com> <535B88C9.6000908@huawei.com> <535DBDA4.6070607@huawei.com> <535EBC96.3090008@nc.rr.com> In-Reply-To: <535EBC96.3090008@nc.rr.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [10.177.22.246] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 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-list@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/oprofile-list >> > > > . >