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Mon, 30 Mar 2020 15:41:13 +0000 Date: Mon, 30 Mar 2020 11:41:10 -0400 From: Joe Korty To: Sebastian Andrzej Siewior Cc: Thomas Gleixner , LKML , linux-rt-users , Steven Rostedt Subject: Re: [ANNOUNCE] v5.4.26-rt17 Message-ID: <20200330154110.GA2975@zipoli.concurrent-rt.com> Reply-To: Joe Korty References: <20200320192830.zeci3rhh5bgbareg@linutronix.de> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200320192830.zeci3rhh5bgbareg@linutronix.de> User-Agent: Mutt/1.5.21 (2010-09-15) X-ClientProxiedBy: BN6PR1101CA0004.namprd11.prod.outlook.com (2603:10b6:405:4a::14) To CH2PR11MB4341.namprd11.prod.outlook.com (2603:10b6:610:3c::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from zipoli.concurrent-rt.com (12.220.59.2) by BN6PR1101CA0004.namprd11.prod.outlook.com (2603:10b6:405:4a::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2856.20 via Frontend Transport; Mon, 30 Mar 2020 15:41:12 +0000 X-Originating-IP: [12.220.59.2] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 85b5ea04-db6a-401e-1d6e-08d7d4c0c6de X-MS-TrafficTypeDiagnostic: CH2PR11MB4456: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; X-Forefront-PRVS: 0358535363 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH2PR11MB4341.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(10019020)(136003)(376002)(346002)(366004)(39830400003)(396003)(316002)(16526019)(66556008)(6916009)(4326008)(54906003)(66476007)(66946007)(508600001)(956004)(33656002)(26005)(81156014)(8936002)(55016002)(44832011)(2906002)(7696005)(186003)(8676002)(1076003)(5660300002)(4744005)(3450700001)(86362001)(81166006)(52116002);DIR:OUT;SFP:1102; Received-SPF: None (protection.outlook.com: concurrent-rt.com does not designate permitted sender hosts) X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: bAwDfbNpX28Ssr0a9nZegFhWm9rPpi9+zEjgwCoc5CAM7uZ6pFMz8wjvdxgSciL9WKrssQQyLtVwmXePLyJ4mHqc1XC51FeO4V/Sp24DOj8U0zhhhwKOM/lo7w12RXDqOFvwHtCpKbJRUgb9J+RZ4WU+o0ZKYTSH7Z2yqBCBQGrRm0idB3zvKamPEBp0UyNqtkvVMFEK5c40V2nZC9aGptJB9EG9EAC9WhrkMjGQ0yII6RAeGe0OrNvWuSEUO0V8Osm2bER2sf5OvoLBACc0BGlW89esrlP90cxCcmSQoyN6D00KiJieFd/xkjhNsTzFqiQX7mROxYhyQU3Agi3ZFQrnschsp5X9LvwR4QFUKDc6ykLW4QEOuwXELCks9IFA0jX/L//71o+VuY7N0ipT7wD+tApG9CvwuPEF2EwXAg503QVYqQBapQ2dn/7QVwJG X-MS-Exchange-AntiSpam-MessageData: KL0keY/EBpLQEgn2x9FOdvPwaM1KPHgXWG7f7lRhTSAPUDWFkZo0XYjux+RlM5uy7J61p2Jq0OlM8bBO6rBHMccxOWRVTx/x5j1Ck/EBbtwsyueSfc5NOQPHXHryTKkpGpyZTqAr0cmxg9AyiPNjpQ== X-OriginatorOrg: concurrent-rt.com X-MS-Exchange-CrossTenant-Network-Message-Id: 85b5ea04-db6a-401e-1d6e-08d7d4c0c6de X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Mar 2020 15:41:13.4547 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 38747689-e6b0-4933-86c0-1116ee3ef93e X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 2ar/Tm2CNhmDZ4av4Gkpennc5vtnkiieZu/ba40sHsaVeah3h6NlZekE9s08x1uWOCzSh/Q5Ht/MnShQLk/fz56YF6HurpdJ+PCYe2RdwI4= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR11MB4456 Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org On Fri, Mar 20, 2020 at 08:28:30PM +0100, Sebastian Andrzej Siewior wrote: > Dear RT folks! > > I'm pleased to announce the v5.4.26-rt17 patch set. > > Changes since v5.4.26-rt16: > > - Revert the "cross CPU pagevec" access with a static key switch. The > old behaviour has been almost fully restored: There is no cross CPU > access of the local_lock. Instead the workqueue is scheduled on > remote CPU like in the !RT case. [try #2] This reversion fixes the oops I was getting when CONFIG_PREEMPT_RT=n, CONFIG_PREEMPT=y, with nohz_full operational, when the system is under heavy memory pressure (mem=4G on the kernel command line, 8 cpu setup, make -j11 kernel build).