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Thu, 10 Apr 2025 09:42:00 +0000 Message-ID: <917bb3c8-e084-4790-b0ac-f0433cfca758@intel.com> Date: Thu, 10 Apr 2025 17:41:45 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 0/8] perf sched: Introduce stats tool To: Swapnil Sapkal CC: , , , , , , , , , , , , , , , , , , , , , , , , , References: <20250311120230.61774-1-swapnil.sapkal@amd.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <20250311120230.61774-1-swapnil.sapkal@amd.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SG2PR06CA0219.apcprd06.prod.outlook.com (2603:1096:4:68::27) To DM4PR11MB6020.namprd11.prod.outlook.com (2603:10b6:8:61::19) 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: DM4PR11MB6020:EE_|LV3PR11MB8580:EE_ X-MS-Office365-Filtering-Correlation-Id: a80a855f-928b-4bf1-764c-08dd7813f0df X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014; 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For ex, `perf sched record` > has ~7.77% overhead on hackbench (with 25 groups each running 700K loops > on a 2-socket 128 Cores 256 Threads 3rd Generation EPYC Server), and it > generates huge 56G perf.data for which perf takes ~137 mins to prepare > and write it to disk [1]. > > Unlike `perf sched record`, which hooks onto set of scheduler tracepoints > and generates samples on a tracepoint hit, `perf sched stats record` takes > snapshot of the /proc/schedstat file before and after the workload, i.e. > there is almost zero interference on workload run. Also, it takes very > minimal time to parse /proc/schedstat, convert it into perf samples and > save those samples into perf.data file. Result perf.data file is much > smaller. So, overall `perf sched stats record` is much more light weight > compare to `perf sched record`. > > We, internally at AMD, have been using this (a variant of this, known as > "sched-scoreboard"[2]) and found it to be very useful to analyse impact > of any scheduler code changes[3][4]. Prateek used v2[5] of this patch > series to report the analysis[6][7]. > > Please note that, this is not a replacement of perf sched record/report. > The intended users of the new tool are scheduler developers, not regular > users. > > USAGE > ----- > > # perf sched stats record > # perf sched stats report > # perf sched stats diff > May I know the status of this patch set? I tested it on a 96 cores system and it works as expected in general. One nit question: Is perf.data and perf.data.old the default files for comparison if no files are provided in perf sched stats diff? thanks, Chenyu