From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C1AD7CCF9E9 for ; Wed, 29 Oct 2025 06:09:20 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4cxGzC0MCSz2yG3; Wed, 29 Oct 2025 17:09:11 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=pass smtp.remote-ip="2a01:111:f403:c10d::1" arc.chain=microsoft.com ARC-Seal: i=2; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1761718151; cv=pass; b=a9yoszz+ORx87afkVj7Z9g30CBU+KHawtuDIxXapcgFKQjwE5Hauc74EqIC1PA4SdFkEhgb0FKivDi6Q7h0tAvLDv6/EPSK16UKSm16IQ8Vq//OSJ6dPDXYB6ES5yZK6Br22tWlOzAXpNwxCXawPAjT5c/8KMHrYPmGC2RlnUKcH158DWd6/SgVNC7So2lHZ0NkmBqFT3e9rXD4iE56tm+3/RMHqTp39+EkOB7JHYRLOrigKNtNHY/VT26HIopmO5SyjBVTvZV3cGqeHLzTyy+YW497Zhw709BfOpUg6FOaz0HJpKog8bRW+BZVFLn1rBlkx01xSOwab3fYL4YTpoQ== ARC-Message-Signature: i=2; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1761718151; c=relaxed/relaxed; bh=Bf2pksGozU2PzHkKjS8iLPk3w3bSpiy8VFoltIQiG9E=; h=Message-ID:Date:MIME-Version:Subject:To:CC:References:From: In-Reply-To:Content-Type; b=KFITLLPYa2cZ8YD7ONc7l2PMjirfFuXjmaJ6dpF05EFC8TugX9PGlahx68UuxVXSlNc5hEqG5xbbkffdrXtYFpfHpxdkS4RNnx8mEsf0JYv/nBECndeMF5IC8JSLLan2Frjs31hvzd3vy9AXU/vjl/TuUPUsSl3fOpzQIR5lr4qy/2n0woaJbzAEFT4w1Dupq+2CNB0mvdGm2WJ5r5i8XHH8uapq7KEiQ7hf5/XlMPf8SG0SgJxDwl1RaaZq5kVqfjfcKznsRpu9+ZbhfXtLB/tVIUO6oVIRCdnJRiT+4cHquA5BNS1XODFbgHvHMfMPwt34rY5xa39UqpSK+NuAxQ== ARC-Authentication-Results: i=2; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; dkim=pass (1024-bit key; unprotected) header.d=amd.com header.i=@amd.com header.a=rsa-sha256 header.s=selector1 header.b=o/yy+MjL; dkim-atps=neutral; spf=pass (client-ip=2a01:111:f403:c10d::1; helo=sn4pr2101cu001.outbound.protection.outlook.com; envelope-from=kprateek.nayak@amd.com; receiver=lists.ozlabs.org) smtp.mailfrom=amd.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=amd.com header.i=@amd.com header.a=rsa-sha256 header.s=selector1 header.b=o/yy+MjL; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=amd.com (client-ip=2a01:111:f403:c10d::1; helo=sn4pr2101cu001.outbound.protection.outlook.com; envelope-from=kprateek.nayak@amd.com; receiver=lists.ozlabs.org) Received: from SN4PR2101CU001.outbound.protection.outlook.com (mail-southcentralusazlp170120001.outbound.protection.outlook.com [IPv6:2a01:111:f403:c10d::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4cxGz93PX7z2xnk for ; Wed, 29 Oct 2025 17:09:08 +1100 (AEDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=JYj5qGv9HUfkSx93of5oGw9QZ9Z+3hsfwJq1Tw0mBIfPNfpMtNXuj+TVkCCJLR2pyinm9I/5TlyZ3pnDOSyWHrd4DcSgXbfKvOvcVlKIcy5sb2qRzgO/87u+fEWgfPB3l33Vs6T5EOvqwpxROF72HJJ395dQbU4kdICJXWIm4WFFdHbx7oOEaxfRmDIVkTGG+xMPqmhDo1is0XrXmKgVOmDyRSPrCdRhsRBE5AOe+6umxSv0Mm+QETyk0CrwQaVywLX929dZUUF3h/ppIR2IBQssts4PYkzEzWI2LMPyPrflJDO/HeJCpHQcLlqDl6uUcDTW25tpog7mYNGeGl2WMA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=Bf2pksGozU2PzHkKjS8iLPk3w3bSpiy8VFoltIQiG9E=; b=VDTSjJm1mx30m/DhHNQyCdDsDnPE9LhHnRCufFgC5v3NhIrgSzMed+vUUgzh5gLyTpgaQ5mwCYex1p/hfoZ3gFjB4rReV+81/aizS9rr6618VQGnjAd5bbyvhmQUNIOIL+024tXlLJwJZFcEI/fim12iOXXpLPjhr12a/D5yGN8jfkwbiUBVpxEnyrBdnGVs7riUuQfQ0is/9WEthf4/XDL4By8jBPmm3qtvI2ckOFywArZ164JJE5QAuyjYj2yl45FjBDli9VJLG8ZjrGnYQ1B1L+YMtxKtgjfUSyJeF4I1DIt9FhIB6StFbnRfgkYafHEYnVP7MmnYbjud3Bfeaw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=linux.ibm.com smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Bf2pksGozU2PzHkKjS8iLPk3w3bSpiy8VFoltIQiG9E=; b=o/yy+MjLxyvoYOLXXvEuwszjtrOVsIHWJ4/jt8VzjceAb094oDWHhAW4pW1wKE6kyWboCBqjXCsNb4HrQO6QrvVJ/rr5kyRsksofGc9jaZg2uq7yWiof7pOff2VPFbKTz/K1UmDwmSymN0Za1vgboMalSXaqsEl+BmaSyV6JxBo= Received: from SA1PR04CA0010.namprd04.prod.outlook.com (2603:10b6:806:2ce::16) by BN7PPFCEE68E7BF.namprd12.prod.outlook.com (2603:10b6:40f:fc02::6e2) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9253.18; Wed, 29 Oct 2025 06:08:42 +0000 Received: from SA2PEPF00003F65.namprd04.prod.outlook.com (2603:10b6:806:2ce:cafe::64) by SA1PR04CA0010.outlook.office365.com (2603:10b6:806:2ce::16) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9275.14 via Frontend Transport; Wed, 29 Oct 2025 06:08:40 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; 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=satlexmb08.amd.com; pr=C Received: from satlexmb08.amd.com (165.204.84.17) by SA2PEPF00003F65.mail.protection.outlook.com (10.167.248.40) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9275.10 via Frontend Transport; Wed, 29 Oct 2025 06:08:41 +0000 Received: from SATLEXMB03.amd.com (10.181.40.144) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.17; Tue, 28 Oct 2025 23:08:41 -0700 Received: from satlexmb07.amd.com (10.181.42.216) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 29 Oct 2025 01:08:41 -0500 Received: from [172.31.184.125] (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.17 via Frontend Transport; Tue, 28 Oct 2025 23:08:36 -0700 Message-ID: <48f6372c-5cc6-472d-b2d2-31e151d85652@amd.com> Date: Wed, 29 Oct 2025 11:38:35 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] sched: Feature to decide if steal should update CPU capacity To: Shrikanth Hegde , Srikar Dronamraju , CC: Michael Ellerman , Madhavan Srinivasan , , Ben Segall , Christophe Leroy , "Dietmar Eggemann" , Ingo Molnar , "Juri Lelli" , Mel Gorman , Nicholas Piggin , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , "Valentin Schneider" , Vincent Guittot References: <20251028104255.1892485-1-srikar@linux.ibm.com> <8ec843b6-ac7d-4cef-a0b1-12b85470fde8@linux.ibm.com> Content-Language: en-US From: K Prateek Nayak In-Reply-To: <8ec843b6-ac7d-4cef-a0b1-12b85470fde8@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Received-SPF: None (SATLEXMB03.amd.com: kprateek.nayak@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003F65:EE_|BN7PPFCEE68E7BF:EE_ X-MS-Office365-Filtering-Correlation-Id: b02e6c79-fadd-40a1-36ab-08de16b19c3a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|36860700013|82310400026; X-Microsoft-Antispam-Message-Info: =?utf-8?B?S3dGQmFjd2t1TDVkV2NPVStOeVBGVVVTR2Uvc1hPQXA0VEZrNk9hWFJBaUtv?= =?utf-8?B?YjArSVBLak1pR3lJVExHVTduZXlaeXBMc0UxQkN6azhTSUplUDgrY0w5bERr?= =?utf-8?B?TGJPcU5LWUJRWnhMVnZpOUQvVit0Qjl0V0NoV3VSd1d6Vml2RE5QYzg0cWpR?= =?utf-8?B?VklYcmZGSEppUksxSGtkbXBvVlQ5emUyWUlwWHVUTWdaUnhZeGNyaE40QVpl?= =?utf-8?B?cWsycEM0OW8wRkNlTkVGRmY3TEhpeHozVDVOMTAzQzgyTDdNd29vaGx1NXVy?= =?utf-8?B?VWYzNU9DVm1UN1JscVZzYXlxZHZGYUxXV1k3RjR1ZWdqOXlZVHQyZzQrSDZF?= =?utf-8?B?MjdKbkZBNFppZXRjQzVUOGdjdzJRbVBEZm1yWUNBb1NOOWJtdEI0YnJ5cTNh?= =?utf-8?B?NXBOb1djaTMyUitkQiszYlA3SE5FVU9CUEkyNFRocU92QklhU0JyZ2FDeThZ?= =?utf-8?B?UHhUTXVndHloMkVqM0dSMTYrMTlWak9Md3Vqay9VcVNlWnZDbEpOSzkxTVhX?= =?utf-8?B?Mk9EWEdKQnFZcXVJTXlzSHVwWUZicXZpSFNJM3VzckZVOEg1QmtEVkVvc3k0?= =?utf-8?B?K1R6b2Qyb3RGam1WeXJIMUhhb0lQanArL3Rob29TaHJPMGE3MFFmSlowcXd4?= =?utf-8?B?aHp4S0hFb2JjbnIyQ0g5TmlqR3ptc0IrQW1xY0RyQ1VCZVVIQ3VsQURnZGsw?= =?utf-8?B?aTFoU1lNaGZESkcvS2pJM204Z2k5RnRYdzFPSzhObDNldVRUTXBVRmo2S3Zy?= =?utf-8?B?bWgzdyttZGYvZVBHazdvNVlTbnB6akxKeG9IWmk5K2QzaktPM1BLUllaOFF1?= =?utf-8?B?U2hhUG5OQUFocmdHdk9ha1d2SHBDaDBndGRSYXJyVHlEMkwyMXVsM3p6ME44?= =?utf-8?B?SlNQdDJOTVhaYzU1d1NNS2o3RGNDVWpCR0xNeVMyS3l0TFVSRHlHY2Z5RStH?= =?utf-8?B?YUw1SndVQmt3VzN4V05CZGZIZ3FJZjZFZk5BNUQ4NlN6c3FGL2I3c1ZtK0s4?= =?utf-8?B?aTNEUjBsSmpURG00MElZUDJmdVpUTWpkTjdna1lZT1YySlBnZ3pkRGpmY200?= =?utf-8?B?WWZzV01IbCtYOW0wcE1zV2ZuK0pXbFk1bTNEOFQra1NUaitkMHc0WnpPNGpy?= =?utf-8?B?U0ZUdWppMW1rQkJmT3dwTFpMWVZlUEpLbGozay8rM2FyRk5yRXM1ZnM4cVdS?= =?utf-8?B?a3RhWmpEL0hhS3dWOXh5VkxwUytDK1FQT0pJSmp0NjgzQlozcWpyeDNDR2N1?= =?utf-8?B?a3lnTDUzaTlZUVA5b0tFekRrdHJ4S1dEcGVIUEp5TVk2TitEdEVyTnhJVEQr?= =?utf-8?B?LzhhZUo0TGlJZW1NdU9HUTBrUE40WjExL242R0g1SmJaZWVJOGM1ZVg2UWln?= =?utf-8?B?YWZ3bXZrSWQrSkxBaHk4Y2xOZVZZeTYzcStaRUZXTkEremxyYUhzallHY3dE?= =?utf-8?B?cTFyTm42ek1qYjVpQ3FzTEdRVFBrazRXazdhV0JhakVFTktRcjdtaTgwZDYy?= =?utf-8?B?Z0NHWE1NSzhIMzR0Vm5qeGhhMDBKWmM1T2V2Q3F1VFVBSXJxYUFxVUtCVnM1?= =?utf-8?B?WTlPaHZGa2ltS0c3dTArTTVIc1dJczlyWEFiYUxNWkZuSG5Mc1h3RE45VlAy?= =?utf-8?B?Rm5TNUlCSlpKQUh2R3RCY09RUXJOQ3FMd3B0ZUNCMjBNWXlLSkVlaXlJb1V5?= =?utf-8?B?cXRNeDdONFNlYWtaQ1pNY2FuNUp6RGJsRjJCS1JxWEFFS2w0cmxhTWo4WnBR?= =?utf-8?B?TnBuSWhmb21wZHhlNjBFbTdTeVk4RHlLZGRiOTBvZTJYV2RQOW9FbzJoelVa?= =?utf-8?B?cDUreFUrMzJxdUNGSXk4SFZVMGNHTmpWQTQ3ckpUNElqai9OM3VEZTlFRjY2?= =?utf-8?B?cTdhb2g2L2U5QnRjL29XYUdnOUQ0S0JxR0FlZmZOUkxrQ1pBYVA2UXNQNXF3?= =?utf-8?B?ZXIydkhQR1FRS2NiUWNJQ0htT3QxczhibVo3SS8rS0duTUdocVUrU0JLd0M2?= =?utf-8?B?QWtPckdiUUVTK2JLKzFTc3BLUDdSM0luckE1cFBVTkZKNnFkR1c3SXUzN1pi?= =?utf-8?B?ZS9YS1dVaEVOOXlCSEJMWkJxalF6SlNGWGE0bmg3MldoMzNSNUZnMnNIK051?= =?utf-8?Q?J/LQ=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:satlexmb08.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(7416014)(376014)(36860700013)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Oct 2025 06:08:41.8618 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b02e6c79-fadd-40a1-36ab-08de16b19c3a 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=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00003F65.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PPFCEE68E7BF Hello Shrikanth, On 10/28/2025 8:35 PM, Shrikanth Hegde wrote: >> @@ -792,8 +792,11 @@ static void update_rq_clock_task(struct rq *rq, s64 delta) >>       rq->clock_task += delta; >>     #ifdef CONFIG_HAVE_SCHED_AVG_IRQ > > Curious to know if there are users/distro which have CONFIG_HAVE_SCHED_AVG_IRQ=n Some arch such as s390 doesn't select HAVE_IRQ_TIME_ACCOUNTING which disables IRQ_TIME_ACCOUNTING and HAVE_SCHED_AVG_IRQ. Checking the Ubuntu 22.04 6.8.0-86-generic config on my machine shows CONFIG_IRQ_TIME_ACCOUNTING is disabled by default. Same is the case with 6.14.0-34-generic config on Ubuntu 24.04. -- Thanks and Regards, Prateek