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Thu, 7 May 2020 19:08:21 +0000 From: Elana Copperman To: linux-rt-users , "Vladimir Kondratiev (Mobileye)" <63dc4b5d-c467-4bfb-bce5-74485907c850@intel.mail.onmicrosoft.com> Subject: RE: cgroups CPU time management + PREEMPT_RT Thread-Topic: cgroups CPU time management + PREEMPT_RT Thread-Index: AdYkm/M/lU1yRRU5Sia9bqNtzqcgHQABswyw Date: Thu, 7 May 2020 19:08:21 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=mobileye.com; x-originating-ip: [134.191.232.72] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a117efe9-c551-4ff2-171d-08d7f2ba028e x-ms-traffictypediagnostic: AM0PR09MB2259: x-ld-processed: 4f85ba13-6953-46a6-9c5b-7599fd80e9aa,ExtAddr x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 03965EFC76 x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; 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We are working on a project with a safety requirement to configure cgroups = for resource management, as well as functional requirement for deployment o= f PREEMPT_RT patch. cgroups in general can be used in this context, in particular for managing = resources such as memory; and even for managing CPU time for non-RT tasks.= =A0=20 However, we do see a potential problem with RT tasks, and how the CPU contr= oller would work with the RT scheduling. There is some obvious concern here, and this seems to be backed by what I f= ind online regarding this question. Can you help us to clarify what is the current state of implementation, and= if there is any support for cgroup CPU controller configuration to work ef= fectively with PREEMPT_RT for RT tasks?=A0=20 Thanks=20 Elana