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Received: from PH7PR12MB6588.namprd12.prod.outlook.com (2603:10b6:510:210::10) by MN2PR12MB4064.namprd12.prod.outlook.com (2603:10b6:208:1d3::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6477.29; Wed, 14 Jun 2023 03:50:17 +0000 Received: from PH7PR12MB6588.namprd12.prod.outlook.com ([fe80::b4a6:94bb:6895:645]) by PH7PR12MB6588.namprd12.prod.outlook.com ([fe80::b4a6:94bb:6895:645%4]) with mapi id 15.20.6477.037; Wed, 14 Jun 2023 03:50:17 +0000 Message-ID: <72e58cc7-acde-600d-b9a1-b89d9d8a168b@amd.com> Date: Wed, 14 Jun 2023 09:19:59 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH 3/4] perf mem amd: Fix perf_pmus__num_mem_pmus() Content-Language: en-US To: Ian Rogers Cc: acme@kernel.org, jolsa@kernel.org, namhyung@kernel.org, mark.rutland@arm.com, peterz@infradead.org, adrian.hunter@intel.com, kan.liang@linux.intel.com, james.clark@arm.com, alisaidi@amazon.com, leo.yan@linaro.org, maddy@linux.ibm.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, sandipan.das@amd.com, ananth.narayan@amd.com, santosh.shukla@amd.com, Ravi Bangoria References: <20230613095506.547-1-ravi.bangoria@amd.com> <20230613095506.547-4-ravi.bangoria@amd.com> From: Ravi Bangoria In-Reply-To: Content-Type: text/plain; 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> > The code and comment seem out of sync here. For the hybrid part > perf_pmus__num_core_pmus() will yield 1 if there is no hybrid, so we > can just use perf_pmus__num_core_pmus(). For the IBS OP part, does > that mean that AMD should have 2 mem pmus? Or is IBS OP a core PMU? Sure. Let me remove hybrid part from the comment. There are two IBS pmus: ibs_fetch// and ibs_op//. Both of them are independent of the core pmu (cpu//). An instance of all 3 pmus is present in each hw SMT thread. And, perf mem/c2c internally uses ibs_op// pmu on AMD. See tools/perf/arch/x86/util/mem-events.c static struct perf_mem_event perf_mem_events_amd[PERF_MEM_EVENTS__MAX] = { E(NULL, NULL, NULL), E(NULL, NULL, NULL), E("mem-ldst", "ibs_op//", "ibs_op"), }; Hope this clarifies. > Can we add this as an example in the core/other documentation in patch > 1, as you've done for ARM, for clarity. Sure. Let me also add IBS example in the patch #1 comment. Thanks, Ravi