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Mon, 27 Jan 2025 11:42:43 +0000 Message-ID: <1954a8b1-83f0-4959-98d3-743662fc7de2@intel.com> Date: Mon, 27 Jan 2025 13:42:34 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] perf/x86/intel: Clean up PEBS-via-PT on hybrid To: Alexander Shishkin , , , , , , , References: <20250124183432.3565061-1-kan.liang@linux.intel.com> <87y0ywzj7o.fsf@ubik.fi.intel.com> Content-Language: en-US From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: <87y0ywzj7o.fsf@ubik.fi.intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MI1P293CA0023.ITAP293.PROD.OUTLOOK.COM (2603:10a6:290:3::9) To BYAPR11MB3605.namprd11.prod.outlook.com (2603:10b6:a03:f5::33) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR11MB3605:EE_|SA1PR11MB8574:EE_ X-MS-Office365-Filtering-Correlation-Id: 6b816d3a-3900-40fb-b8b3-08dd3ec7b662 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; 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But it never works. >> >> $ dmesg | grep PEBS >> [ 1.793888] core: cpu_atom PMU driver: PEBS-via-PT >> >> $ perf record -c 1000 -e '{intel_pt/branch=0/, >> cpu_atom/cpu-cycles,aux-output/pp}' -C8 >> Error: >> The sys_perf_event_open() syscall returned with 22 (Invalid argument) >> for event (cpu_atom/cpu-cycles,aux-output/pp). >> "dmesg | grep -i perf" may provide additional information. >> >> The "PEBS-via-PT" is printed if the corresponding bit of per-PMU >> capabilities is set. Since the feature is supported by the e-core HW, >> perf sets the bit for e-core. However, for Intel PT, if a feature is not >> supported on all CPUs, it is not supported at all. The PEBS-via-PT event >> cannot be created successfully. >> >> The PEBS-via-PT is no longer enumerated on the latest hybrid platform. It >> will be deprecated on future platforms with Arch PEBS. Let's remove it >> from the existing hybrid platforms. > > There are still lots of them in use in the wild, I'd still like to fix > this properly instead of chopping it off. Unless there's a reason not to? The kernel has never supported PEBS-via-PT on hybrids before. AFAIK no one is asking for it on hybrids. Note, it will continue to work on non-hybrid atom/e-core systems like ADL-N etc