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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by CO1PEPF00012E7D.mail.protection.outlook.com (10.167.249.52) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.181.6 via Frontend Transport; Thu, 2 Jul 2026 18:41:53 +0000 Received: from satlexmb10.amd.com (10.181.42.219) 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 15.2.2562.41; Thu, 2 Jul 2026 13:41:52 -0500 Received: from satlexmb08.amd.com (10.181.42.217) by satlexmb10.amd.com (10.181.42.219) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Thu, 2 Jul 2026 13:41:52 -0500 Received: from [172.31.184.125] (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server id 15.2.2562.41 via Frontend Transport; Thu, 2 Jul 2026 13:41:46 -0500 Message-ID: <191a3d02-1dd0-4f74-a977-874678632b7d@amd.com> Date: Fri, 3 Jul 2026 00:11:40 +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 09/12] sched_ext: Delegate proxy donor admission to BPF schedulers To: Andrea Righi , Tejun Heo , David Vernet , Changwoo Min , John Stultz CC: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , "Mel Gorman" , Valentin Schneider , "Christian Loehle" , David Dai , Koba Ko , Aiqun Yu , Shuah Khan , , References: <20260702171909.1994478-1-arighi@nvidia.com> <20260702171909.1994478-10-arighi@nvidia.com> Content-Language: en-US From: K Prateek Nayak In-Reply-To: <20260702171909.1994478-10-arighi@nvidia.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: vqVRT09ttWf88DGdEMgxf6OsEfgyrfGebBi4T1Ty1kPi9D+R2NRGXg2+a3RIHAVGNLcv9S0R4b1wE8dSIjdZC/OfcyvY9XeEinZR7CLmlIIp5YwANUCCIibhL855vVdWxqAi9VI9WKxG6NFNqptZERjIcjGPh9w27x96ZknXnMGo8i2yx5T3OQozJf2LaRR6MQZL3ukWrYd86ydma1D4q+rAeLCoe6rsAGo5L+d5+tujGqwg9z0aiL9T5tk3704l2i+bTdKrT6Ch+oK92WC/81jmsKb1iwRYjojfZsH1yu3fqH91nSflICwx6oSj4ERYbS1GdhO033/tiN09f3ihg2nUv5ts8etL0lQLTK8oTsnh5OdGbf8g3jROOP9x3nLol59+tg3fcvqp+90CnckSRBm8MPhjt6LadwKtwYiIzpXL7Qb3F0DyVAYL15/bfUp9 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jul 2026 18:41:53.6196 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bac24e72-fc72-49e2-20cd-08ded8699646 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: CO1PEPF00012E7D.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6277 Hello Andrea, On 7/2/2026 10:39 PM, Andrea Righi wrote: > @@ -7148,7 +7181,8 @@ static void __sched notrace __schedule(int sched_mode) > * task_is_blocked() will always be false). > */ > try_to_block_task(rq, prev, &prev_state, > - !task_is_blocked(prev)); > + !task_is_blocked(prev) || > + !scx_allow_proxy_exec(prev)); > switch_count = &prev->nvcsw; > } > > diff --git a/kernel/sched/ext/ext.c b/kernel/sched/ext/ext.c > index c48d043dbe58f..8ffbf857acd51 100644 > --- a/kernel/sched/ext/ext.c > +++ b/kernel/sched/ext/ext.c > @@ -23,6 +23,14 @@ > > DEFINE_RAW_SPINLOCK(scx_sched_lock); > > +bool scx_allow_proxy_exec(const struct task_struct *p) > +{ > + if (!task_on_scx(p)) > + return true; > + > + return scx_task_sched(p)->ops.flags & SCX_OPS_ENQ_BLOCKED; > +} > + What happens when we switch in a a sched-ext scheduler that doesn't support proxy? There would be a bunch proxy donors already preset at the time of the scheduler loading but I don't see anything in the enable path that would take care of those tasks by blocking them completely. Is it handled elsewhere? -- Thanks and Regards, Prateek