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Tue, 26 May 2020 15:01:38 +0000 From: Elana Copperman To: Sebastian Andrzej Siewior CC: Steven Rostedt , linux-rt-users , Thomas Gleixner , "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/lU1yRRU5Sia9bqNtzqcgHQABswywAO9u+OsAADfTaQAAPKEAAAAUa8ACwgHSAAAAMu7HAAC8TOs= Date: Tue, 26 May 2020 15:01:38 +0000 Message-ID: References: <20200512093612.416899e1@gandalf.local.home> ,<20200526143340.ooykhoszyd4lxi2g@linutronix.de>, In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: linutronix.de; dkim=none (message not signed) header.d=none;linutronix.de; dmarc=none action=none header.from=mobileye.com; x-originating-ip: [77.124.25.28] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 8eb8e02f-483a-401b-233d-08d80185b107 x-ms-traffictypediagnostic: AM0PR09MB3426: x-ld-processed: 4f85ba13-6953-46a6-9c5b-7599fd80e9aa,ExtAddr x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; 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x-ms-exchange-antispam-messagedata: j9A4GLRXZ35Y0zXnZMa/kQ5czn8RNbNFo4jSNUi42vsxIaLrFLbsiSp14kYjr6nOZpzgJxFTQVm+hoK4dBaO9go9Woe9TgjFxgiCavQaApPbSExih3OdyVoO/vkYXM/LRm8RD+8uXKb1goJplVEp/ROk9fabTZnDvmJhBkj+M5m4Q9t5HMmmhdm9kp06RGI7pYuBSEr4sM7QqbvsWOSFMBYbaE+4beLV7WpfNlyoTOQKOmse3H5CheSDUXTqV1oL6yOJOLD8EVaUsbO/Q30wX2aJrKmgqnf+C6QDTonX5cvKynkh1XTsSpYNDl4r8s5nh7rCxL7MjH5he1h9r9LOrR38bqpv/EqbEz4oWJCv7RflS0ldceZqfV6lo3u4ypJ/ePVLxxTKU2d7zaGfIrGPJSUrb6KiHtZpwDFJlen/IUtSTTaEAhKPtQM8MxUncErO1b0pjn4h8+Yd9r4CvegMK0fjT40xVYb1h3ZarVhB8Gk= x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: mobileye.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8eb8e02f-483a-401b-233d-08d80185b107 X-MS-Exchange-CrossTenant-originalarrivaltime: 26 May 2020 15:01:38.4601 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4f85ba13-6953-46a6-9c5b-7599fd80e9aa X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: zGzo8EYcOKnIjuG+C2I14M1zQoCzmLF0WeeAM0EJvPeLu5wTFoTnl0KGg+3/HNn/Rf9JZdoAWWfDTQf9M2vo/Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR09MB3426 Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org Thanks, Sebastian, for your reply.=0A= Yes, it is about RT_GROUP_SCHED (and related parameters such as cpu.rt_runt= ime_us and cpu.rt_period_us).=A0 The documentation=A0 (such as=A0 =A0https:= //www.kernel.org/doc/Documentation/scheduler/sched-rt-group.txt=A0) is fuzz= y on details and is not dated, so it was not clear if we were missing anyth= ing.=0A= =0A= Anyhow, thanks for the confirmation.=A0 I think we will go back to the orig= inal plan and avoid using cgroups for managing CPU time for RT tasks.=A0 = =A0Perhaps with time and experience on the implementation, we may have a be= tter view on how to properly enable this.=0A= Regards=0A= Elana=0A= =0A= =0A= From: Sebastian Andrzej Siewior =0A= Sent: Tuesday, May 26, 2020 5:33 PM=0A= To: Elana Copperman =0A= Cc: Steven Rostedt ; linux-rt-users ; Thomas Gleixner ; Vladimir Kondratiev (= Mobileye) <63dc4b5d-c467-4bfb-bce5-74485907c850@intel.mail.onmicrosoft.com>= =0A= Subject: Re: cgroups CPU time management + PREEMPT_RT =0A= =A0=0A= On 2020-05-12 13:41:03 [+0000], Elana Copperman wrote:=0A= > =0A= > =0A= =0A= I think you missed to write a reply or I didn't find it.=0A= So if this is about RT_GROUP_SCHED then it is disabled in RT because it=0A= was once broken. Since then people asked about it and I told them to=0A= please test it and report back what the results are but I never got a=0A= reply back.=0A= =0A= Sebastian=