From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from BN1PR04CU002.outbound.protection.outlook.com (mail-eastus2azon11010012.outbound.protection.outlook.com [52.101.56.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C9CED318EC7 for ; Tue, 11 Aug 2026 06:11:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.56.12 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786428669; cv=fail; b=b5gQapSsJCEDTEzK/qEplkz9g/vRZvi8AYT3KRxZCS43O5XRSCPMmBTLvreYFt7h4ZYizV0HsyRkdjvYCg651TLy7ydUwKKNTxdZ2s42DV0ILhG3/HRxlLGahWNFgVOZMPCMydSr62UwM7Ealy6Lnn/LuOSxbSBIHjCEp6nlUBw= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786428669; c=relaxed/simple; bh=xOMrha7wQRz/YFk97mDCy0jMCjKt4qbGTp2gDWUWWlo=; h=Message-ID:Date:MIME-Version:Subject:From:To:CC:References: In-Reply-To:Content-Type; b=s4BZJx42gleQrJYYYVE3ZowtXSRum3FFZIZGb6HR4IhZzqibpsSHFNUzf+w+HxB9GondevEkft6UbviOlcdjvC0ETPAduS4FMqyIIMO02xQxmGZK9nRgt3CcaZ47nnCslHIDo4sqUXT55Km6mXpOiQJUKBxUkSUGRKi4T5YKM0k= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=5i8cp+sI; arc=fail smtp.client-ip=52.101.56.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="5i8cp+sI" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=ZuxGrYv0iqzBzXvx/mlxUg74rvNvXYeb5GpNS9fs1JTtFxZXC0nBy0UoTaBBqv0ZsH/556LI/D8iCOUL8H/hYx2+XlSKZRkfi/uAf6I9Q5pViuGm4Lr3WiC4jYVYGA8Zq8Y4VX+hHXva56JPCn1mKh5RjWQ/Tzqz1fRwR+pRX3fRjyGe/jqxisDcROWNHKwY+DB6pNQpm3g2ZAgra3C7z1Fd1HssssnSQkw1pg79Vyq0jJn09YTnmclGvOQrXmGz/8sZxYTJIXEVQF+8Tq/IBPwIaoJ9wp4vn4ZCjomlw04k14xjFPpmJvtyKNI9QmwKew+5nLwxfvqlWIIRqb2ZCA== 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=Unbh9c5RZEt05jiww9dOOThx+BvQ+hPILBrCFHfQqgU=; b=lhJmgLOuOF3PyyiBFvuMO3+toLHueTekipnoOwz7DUyQ6iDU0spVjYKtJjIdEX9OoHS7TJG2W+sJHLpz9VeM4E/QhB+uz1DNxmeMEZt8S45qJ87p/JHPRQPQOFv1NdJTUZrIL1IcPnBTprrWnWv4kk8fZd7FLitB3FQp0sRvrZ4P4ixXDa2fL09W6BVYJ2p7/S32WhlCogH0o2h1g27iT26X2YemCqX65xBxubfpQXPmPip8Ta5Q2Wf5ocHNotrVmJHUvvuGAmCzZJqjptQ7gjlmMehVlLwFxtEajCeOiLBf0L8MnW8+DZ41tygUOMMSA1xnZ65KId/guXMgS4DGHg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=google.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=Unbh9c5RZEt05jiww9dOOThx+BvQ+hPILBrCFHfQqgU=; b=5i8cp+sI6nUQNoQRCdJW+w9ZUfAz4sjwtl4itUfQLz+c0thApq8Mm/EPMLPJUdJSGbRexQCZiiGnWVJhu7DfH1/pZdPuQ0JUxMEJW8hhszBgz7lz8zTBz/SIgarJbJGbElr7szlE5gPa4ufNUIKQcGLcUYrURQ96Qn3QXypxqSo= Received: from BN9PR03CA0229.namprd03.prod.outlook.com (2603:10b6:408:f8::24) by DS2PR12MB9640.namprd12.prod.outlook.com (2603:10b6:8:27d::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.292.25; Tue, 11 Aug 2026 06:10:59 +0000 Received: from BN2PEPF000044A3.namprd02.prod.outlook.com (2603:10b6:408:f8:cafe::9a) by BN9PR03CA0229.outlook.office365.com (2603:10b6:408:f8::24) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.21.292.25 via Frontend Transport; Tue, 11 Aug 2026 06:10:59 +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=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by BN2PEPF000044A3.mail.protection.outlook.com (10.167.243.154) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.315.6 via Frontend Transport; Tue, 11 Aug 2026 06:10:59 +0000 Received: from satlexmb07.amd.com (10.181.42.216) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.45; Tue, 11 Aug 2026 01:10:59 -0500 Received: from [10.136.45.191] (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.45 via Frontend Transport; Tue, 11 Aug 2026 01:10:52 -0500 Message-ID: Date: Tue, 11 Aug 2026 11:40:46 +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: [RESEND][PATCH v31 1/9] sched/deadline: Ignore proxy-exec sched_yield() From: K Prateek Nayak To: John Stultz , Peter Zijlstra CC: LKML , Christian Loehle , Juri Lelli , Joel Fernandes , Qais Yousef , Ingo Molnar , Vincent Guittot , Dietmar Eggemann , Valentin Schneider , Steven Rostedt , Ben Segall , Zimuzo Ezeozue , Will Deacon , Waiman Long , Boqun Feng , "Paul E. McKenney" , Metin Kaya , Xuewen Yan , Thomas Gleixner , Daniel Lezcano , Suleiman Souhlal , Andrea Righi , kuyo chang , hupu , References: <20260807035232.1881495-1-jstultz@google.com> <20260807035232.1881495-2-jstultz@google.com> <20260810155603.GY776954@noisy.programming.kicks-ass.net> <76bf6fb3-2406-4a01-a37d-1626ef34ae18@amd.com> Content-Language: en-US In-Reply-To: <76bf6fb3-2406-4a01-a37d-1626ef34ae18@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF000044A3:EE_|DS2PR12MB9640:EE_ X-MS-Office365-Filtering-Correlation-Id: 6a382bb2-08d0-4726-8c0b-08def76f5060 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|82310400026|1800799024|23010399003|7416014|18002099003|22082099003|56012099006|5023799004|11063799006|4143699003|10067099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(36860700016)(376014)(82310400026)(1800799024)(23010399003)(7416014)(18002099003)(22082099003)(56012099006)(5023799004)(11063799006)(4143699003)(10067099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: WV5SvXTJHZWqLkf0KJ17GlogglpK386HGjjyQuJlzFLuncPRpPLGN9lsEbbWyoVe+MfNZazs6uKfDUEmdOPMRnabiDkSIgnmVbCUxIE9ggI7SByK75USwGeLFdHv+w7YOdHkoC9v4keM7lSpU52Iu51in9f3VvJqiHo9goDjUJlANRARU8l0EjSzlxRRFaOPSiDIDfvWoYrnYp7E8WBSxQpl6BrSOFNzuY2KiP29tMvuyPzpio3l4pyXiTsPpRMqCTdBcYXEoR3lyELOgYqkecsFo6SKGrLjmtUhhFMNFfdPEQt6/0VoIpY0NmAI7fesNVl/kHn9khZsyO7DCF8ybNDGDiN40UyDZuRr1khtEwQlklFlEAWjZVXJEIdDdqB0JSRP29RJZ1S5p5PFgZEGIy+k2LG7NZw+NerWmCboPl5gTGIJxX6OV/XkSaio0lDh X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Aug 2026 06:10:59.4738 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6a382bb2-08d0-4726-8c0b-08def76f5060 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF000044A3.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS2PR12MB9640 On 8/11/2026 9:25 AM, K Prateek Nayak wrote: > P.S. I dropped this patch and added the following on top of this > series on top of tip:sched/core and nothing has crashed (yet): > > diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c > index a3003b0f4522..797cb316fcd1 100644 > --- a/kernel/sched/deadline.c > +++ b/kernel/sched/deadline.c > @@ -101,7 +101,11 @@ static inline struct sched_dl_entity *pi_of(struct sched_dl_entity *dl_se) > > static inline bool is_dl_boosted(struct sched_dl_entity *dl_se) > { > - return false; > + struct dl_rq *dl_rq = dl_rq_of_se(dl_se); > + struct rq *rq = rq_of_dl_rq(dl_rq); > + > + return sched_proxy_exec() && rq->donor != rq->curr && dl_task_of(dl_se) == rq->donor; > + > } > #endif /* !CONFIG_RT_MUTEXES */ > > --- Nevermind, I had CONFIG_RT_MUTEXES enabled and on doing: diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 97d6dc039e9b..909174e332ca 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -94,7 +94,7 @@ static inline bool is_dl_boosted(struct sched_dl_entity *dl_se) struct dl_rq *dl_rq = dl_rq_of_se(dl_se); struct rq *rq = rq_of_dl_rq(dl_rq); - return (pi_of(dl_se) != dl_se) || (sched_proxy_exec() && rq->donor != rq->curr && dl_task_of(dl_se) == rq->donor); + return (pi_of(dl_se) != dl_se) || (sched_proxy_exec() && rq->donor != rq->curr); } #else /* !CONFIG_RT_MUTEXES: */ static inline struct sched_dl_entity *pi_of(struct sched_dl_entity *dl_se) @@ -107,7 +107,7 @@ static inline bool is_dl_boosted(struct sched_dl_entity *dl_se) struct dl_rq *dl_rq = dl_rq_of_se(dl_se); struct rq *rq = rq_of_dl_rq(dl_rq); - return sched_proxy_exec() && rq->donor != rq->curr && dl_task_of(dl_se) == rq->donor; + return sched_proxy_exec() && rq->donor != rq->curr; } #endif /* !CONFIG_RT_MUTEXES */ --- I see only a bunch of SCHED_OTHER tasks proxying so clearly that doesn't work but I think proxy should do something similar how rt_mutex handle this under PI. -- Thanks and Regards, Prateek