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Mon, 2 Nov 2026 18:13:49 +0000 Message-ID: <4a950591-fd11-4b93-9c9f-d5724219e7a2@intel.com> Date: Mon, 2 Nov 2026 20:13:42 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/6] perf/x86/intel/pt: Stop tracing at syscore shutdown To: Andi Kleen CC: Peter Zijlstra , 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. 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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 , , , , References: <20261102074039.26983-1-adrian.hunter@intel.com> <20261102074039.26983-4-adrian.hunter@intel.com> 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: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DUZP191CA0015.EURP191.PROD.OUTLOOK.COM (2603:10a6:10:4f9::14) To IA1PR11MB7198.namprd11.prod.outlook.com (2603:10b6:208:419::15) X-Mailing-List: linux-kernel@vger.kernel.org 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_|CH3PR11MB7795:EE_ X-MS-Office365-Filtering-Correlation-Id: 9d72743e-d2d8-49a9-4b34-08df390d0b33 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|7416014|376014|23010399003|1800799024|6133799003|10067099003|22082099003|261102123227099003|18002099003|56012099006|11063799006|5023799004|4143699003|261021135927099003|261022105027099003|261021121427099003|261022075727099003|261026140227099003|261026121527099003|261028144727099003; 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Events are left in place, but record nothing more. >>>> + */ >>>> +static void pt_syscore_shutdown(void *data) >>>> +{ >>>> + WRITE_ONCE(pt_shutdown, true); >>>> + on_each_cpu(pt_shutdown_cpu, NULL, 1); >>> >>> I don't think adding more and more broadcast NMIs to the panic path >>> is a good idea. It's always a very big hammer and a risky operation >>> that risks breaking the actual dump. panic reallhy needs to be >>> simple and reliable, and this is the total opposite. >> >> Is pt_syscore_shutdown() called on a panic path? I can't find a way. > > It's called from kexec which can be called from panic. Normal kexec goes via kernel_kexec(), which calls syscore_shutdown(). Panic has its own path to machine_kexec(): __crash_kexec() -> machine_crash_shutdown() -> machine_kexec(), which doesn't call syscore_shutdown(). On that path PT is already stopped by cpu_emergency_stop_pt().