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Mon, 2 Nov 2026 12:22:11 +0000 Message-ID: <3ec2f0ca-924c-4d25-8800-52dc8deaeeb3@intel.com> Date: Mon, 2 Nov 2026 14:22:02 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/6] perf/x86/intel/pt: Fix tracing across kexec, kdump and suspend To: Peter Zijlstra CC: Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , "Ian Rogers" , James Clark , "Thomas Gleixner" , Borislav Petkov , Dave Hansen , , "H. Peter Anvin" , "Rafael J. Wysocki" , Pavel Machek , Greg Kroah-Hartman , "Danilo Krummrich" , Johan Hovold , "Sebastian Andrzej Siewior" , Mathieu Desnoyers , Jiayuan Chen , "Steven Rostedt (Google)" , "Vineeth Pillai (Google)" , Frederic Weisbecker , "Andi Kleen" , , , , References: <20261102074039.26983-1-adrian.hunter@intel.com> <20261102101034.GV1779021@noisy.programming.kicks-ass.net> Content-Language: en-US From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: <20261102101034.GV1779021@noisy.programming.kicks-ass.net> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DU2PR04CA0158.eurprd04.prod.outlook.com (2603:10a6:10:2b0::13) To IA1PR11MB7198.namprd11.prod.outlook.com (2603:10b6:208:419::15) X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR11MB7198:EE_|DSM1PF4FC338516:EE_ X-MS-Office365-Filtering-Correlation-Id: ecb64b8d-da34-4115-b41f-08df38dbeb5f X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|23010399003|376014|7416014|11063799006|4143699003|56012099006|261028144727099003|261022075727099003|261021121427099003|261026121527099003|261026140227099003|261022105027099003|10067099003|18002099003|22082099003; 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This series fixes several cases where >> that does not currently happen: > > Same is true for PEBS, no? I also saw that AMD/IBS is already Yes, PEBS and BTS > registering a syscore handler. > > Perhaps it should be a perf wide thing, than than having individual bits > and pieces do their own thing? As mentioned in the cover letter, perf core could schedule out/in for syscore suspend/resume, and that would negate the need for "[PATCH 6/6] perf/x86/intel/pt: Stop tracing across system suspend" perf core could handle shutdown too, but it also needs to consider how to stop events from starting again. If that were done, that would mean the syscore ->shutdown() in "[PATCH 3/6] perf/x86/intel/pt: Stop tracing at syscore shutdown" would not be needed, but the other code would move to "[PATCH 4/6] perf/x86/intel/pt: Clear TraceEn in hardware in cpu_emergency_stop_pt()".