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Received: from PH7PR12MB6588.namprd12.prod.outlook.com (2603:10b6:510:210::10) by DS7PR12MB8202.namprd12.prod.outlook.com (2603:10b6:8:e1::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6455.41; Fri, 9 Jun 2023 06:02:47 +0000 Received: from PH7PR12MB6588.namprd12.prod.outlook.com ([fe80::b4a6:94bb:6895:645]) by PH7PR12MB6588.namprd12.prod.outlook.com ([fe80::b4a6:94bb:6895:645%3]) with mapi id 15.20.6455.030; Fri, 9 Jun 2023 06:02:47 +0000 Message-ID: <14b8d80e-9289-969c-7d9e-e9a94d85dee7@amd.com> Date: Fri, 9 Jun 2023 11:32:31 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH v5 28/34] perf pmus: Split pmus list into core and other Content-Language: en-US To: Ian Rogers Cc: Suzuki K Poulose , Mike Leach , Leo Yan , John Garry , Will Deacon , James Clark , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Adrian Hunter , Kajol Jain , Jing Zhang , Kan Liang , Zhengjun Xing , Madhavan Srinivasan , Athira Rajeev , Ming Wang , Huacai Chen , Sandipan Das , Dmitrii Dolgov <9erthalion6@gmail.com>, Sean Christopherson , Ali Saidi , Rob Herring , Thomas Richter , Kang Minchul , linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, Ravi Bangoria References: <20230527072210.2900565-1-irogers@google.com> <20230527072210.2900565-29-irogers@google.com> <7c7d9279-25b0-328e-af41-66c2096febaa@amd.com> <8a642886-89e0-b43f-d7fb-6831519ee62a@amd.com> From: Ravi Bangoria In-Reply-To: Content-Type: text/plain; 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This will later allow for >>>>>>> the core and other pmus to be populated separately. >>>>>>> >>>>>>> Signed-off-by: Ian Rogers >>>>>>> Reviewed-by: Kan Liang >>>>>>> --- >>>>>>> tools/perf/util/pmus.c | 52 ++++++++++++++++++++++++++++++------------ >>>>>>> 1 file changed, 38 insertions(+), 14 deletions(-) >>>>>>> >>>>>>> diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c >>>>>>> index 58ff7937e9b7..4ef4fecd335f 100644 >>>>>>> --- a/tools/perf/util/pmus.c >>>>>>> +++ b/tools/perf/util/pmus.c >>>>>>> @@ -12,13 +12,19 @@ >>>>>>> #include "pmu.h" >>>>>>> #include "print-events.h" >>>>>>> >>>>>>> -static LIST_HEAD(pmus); >>>>>>> +static LIST_HEAD(core_pmus); >>>>>>> +static LIST_HEAD(other_pmus); >>>>>> >>>>>> AMD ibs_fetch// and ibs_op// PMUs are per SMT-thread and are independent of >>>>>> core hw pmu. I wonder where does IBS fit. Currently it's part of other_pmus. >>>>>> So, is it safe to assume that other_pmus are not just uncore pmus? In that >>>>>> case shall we add a comment here? >>>>> >>>>> I'm a fan of comments. The code has landed in perf-tools-next: >>>>> https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/perf/util/pmus.c?h=perf-tools-next >>>>> Do you have any suggestions on wording? I've had limited success >>>>> adding glossary terms, for example, offcore vs uncore: >>>>> https://perf.wiki.kernel.org/index.php/Glossary#Offcore >>>>> I think offcore is a more interconnect related term, but I'd prefer >>>>> not to be inventing the definitions. I'd like it if we could be less >>>>> ambiguous in the code and provide useful information on the wiki, so >>>>> help appreciated :-) >>>> >>>> Does this look good? >>>> >>>> /* >>>> * core_pmus: A PMU belongs to core_pmus if it's name is "cpu" or it's sysfs >>>> * directory contains "cpus" file. All PMUs belonging to core_pmus >>>> * must have pmu->is_core=1. If there are more than one PMUs in >>>> * this list, perf interprets it as a heterogeneous platform. >>> >>> >>> Looks good but a nit here. It is heterogeneous from point-of-view of >>> PMUs, there are ARM systems where they are heterogenous with big an> little cores but they have a single homogeneous PMU driver. The perf >>> tool will treat them as homogeneous. >> >> In that case number of entries in core_pmus list would still be 1 right? > > Right. Heterogeneous platform, homogeneous PMU, single core PMU. Thanks for the clarification. I'll send a patch. Ravi