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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SA2PEPF00003F68.mail.protection.outlook.com (10.167.248.43) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7918.13 via Frontend Transport; Wed, 18 Sep 2024 08:50:07 +0000 Received: from [10.136.32.87] (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 18 Sep 2024 03:46:42 -0500 Message-ID: Date: Wed, 18 Sep 2024 14:15:48 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/5] perf sched: Introduce stats tool Content-Language: en-GB To: <20240916164722.1838-1-ravi.bangoria@amd.com>, Ravi Bangoria CC: , , , , , , , , , , , , , , , , , , , , , , , , , , Madadi Vineeth Reddy References: <20240916164722.1838-1-ravi.bangoria@amd.com> From: "Sapkal, Swapnil" In-Reply-To: Content-Type: text/plain; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Sep 2024 08:50:07.6295 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 80215586-3b6f-4661-8419-08dcd7bee5b0 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00003F68.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB7860 Hi Vineeth, Thank you for testing the series. On 9/17/2024 4:27 PM, Madadi Vineeth Reddy wrote: > Hi Ravi, > > On 16/09/24 22:17, Ravi Bangoria wrote: >> MOTIVATION >> ---------- >> >> Existing `perf sched` is quite exhaustive and provides lot of insights >> into scheduler behavior but it quickly becomes impractical to use for >> long running or scheduler intensive workload. 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 > > per.data file is empty after the record. > > Error: > The perf.data data has no samples! I am not able to reproduce this error on my system. Can you please share `/proc/schedstat` file from your system? What was the base kernel you applied this on? -- Thanks And Regards, Swapnil > > Thanks and Regards > Madadi Vineeth Reddy > >> 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]. >> >> 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. >