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Wed, 10 Feb 2021 10:52:17 +0000 Subject: Re: drm/nouneau: 5.11 cycle regression bisected to 461619f5c324 "drm/nouveau: switch to new allocator" To: Mike Galbraith , lkml Cc: nouveau@lists.freedesktop.org, Ben Skeggs , Dave Airlie References: <1d663cd74af91e23f4f24ebbdd65ef3ba72c15fc.camel@gmx.de> <43924195-c4e1-fce4-5766-aaefe2d6f766@amd.com> <2793c200beb530ed4a8ac32c5eea0f5aaa53c7e8.camel@gmx.de> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: Date: Wed, 10 Feb 2021 11:52:11 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <2793c200beb530ed4a8ac32c5eea0f5aaa53c7e8.camel@gmx.de> Content-Type: text/plain; charset=iso-8859-15; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Originating-IP: [2a02:908:1252:fb60:1e1:ad6e:a509:1753] X-ClientProxiedBy: AM0PR05CA0096.eurprd05.prod.outlook.com (2603:10a6:208:136::36) To MN2PR12MB3775.namprd12.prod.outlook.com (2603:10b6:208:159::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2a02:908:1252:fb60:1e1:ad6e:a509:1753] (2a02:908:1252:fb60:1e1:ad6e:a509:1753) by AM0PR05CA0096.eurprd05.prod.outlook.com (2603:10a6:208:136::36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3846.27 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: =?iso-8859-15?Q?ePbr2bJkV4Svth8RlidCKc3z2o01vlIeOpgVRC4C/tY6GvnfsjAsTVgMp?= =?iso-8859-15?Q?luOTZq09z1phL2zgDQn9G0pDXVqb2SNERqOfgoKZmVWERYgsStgwU/k/I?= =?iso-8859-15?Q?N0SQ/XcBtzWNvXfQvdcSxou4zCE0jlNv8GloW2V/XQFpbqvk0BZ8Q84pd?= =?iso-8859-15?Q?eiC9E595X48rsHIxDO7titZwnokQu8KDOKBWryCIgv7BQ9rlSHjfffm6D?= =?iso-8859-15?Q?6uW62p+cQstTCVNddtebAzOS74Kx+EWIALoyEpu9RDifRFS6rePB8e8Sy?= =?iso-8859-15?Q?PG+xuLJkvH/70eSBXmqSN5i+fMJuXbFoF/xV01HhMhHoEZxM8sW9bbyWm?= =?iso-8859-15?Q?PJdIn9DVex9TiIFjq9BxGMQq1gS7aMAu5e+ct7amMHJhcLyCn8h1Q8dJD?= =?iso-8859-15?Q?7T/x/XtaYdnWuYl9lhaxiV3GW5xZybw9+OU2057zPQaNoXP9zT6ta0A0U?= =?iso-8859-15?Q?jQ0BgaSmR4TMwGvm5MJgK6ZTMwQWLXZZmh3xTaExnm4skRgwnFYVcobPB?= =?iso-8859-15?Q?EsBGhVHiyCH4i67x9B6AF4MlAu18JerthCP/l1bW30PdElVBZAF2B0b/C?= =?iso-8859-15?Q?GrMo3kG30aRIrF2MIroKtA/svEmUq9uab+teeH2EWbfs+YigXEtZa/KtR?= =?iso-8859-15?Q?puKhpXDz1iAydrx2hVomFKCoyNQS3QPaHYvJcDXPvt2sPgHXTo0zZIdMT?= =?iso-8859-15?Q?5OhvZQks3xDW9oqESXojtBBTcBQS0axAlmn5cuK1mRKaR1QejxaNL0UwB?= =?iso-8859-15?Q?iYdGQIf+KZ0bFbQUey7JSYR8w4bI2kUijVQPIsCZAmEBHBq+8IYKx2cr1?= =?iso-8859-15?Q?lGnEOV6kUMKcKetWs6irUhBiQH9DveIlcNudfT7JAncu+f7O07LQTjRU4?= =?iso-8859-15?Q?dttUa1USrYDyUpOXIbmRlOPFKq3k8Vi3UjVe7W9HE0Zucrosge5OpMN8j?= =?iso-8859-15?Q?2OEOTFbK62LFYdGgXry7gMgh3m4O10ID2IDzGJ/ojxwxYRZqZIQ5dQfRq?= =?iso-8859-15?Q?NzCNz9elrS+FUMOoB2TkG/8DKGEDmmWQUoeI+34kzCMhqg9N90o8sNS8x?= =?iso-8859-15?Q?P/1EmLDd1nVHg/PYyZc3neecf9tQ4XERQRvzq3Yn3JwG5l7WD4BeomMmV?= =?iso-8859-15?Q?YZwMYdywjWdtA9iQ7y4KuEEjnK9puZJbhVPYTEoZvpYVuUR0ovrXnlD0H?= =?iso-8859-15?Q?iVJqSZsaUnlFp5vDglKDg+APTIzkzxmGTvF9p4y02XYN5wFrAYazvUs14?= =?iso-8859-15?Q?Luaa9taSMU3iQou+lV47uMr7l3Kz0SDINiRrIMtCXHOUeQGvTsofLMIwV?= =?iso-8859-15?Q?gGtCFsSM+v7MHyywsljwpJ8ZQ9U2X0sz2pwSg4B9ps+Kto8qdhzQHTzXz?= =?iso-8859-15?Q?GLRFa1sGt5WHc7Ixcmd2gQD9YBitr60SrQFBOcCy2DcPXrmkJjVE/w6qD?= =?iso-8859-15?Q?P3U/bzgBJj+uCTK18bQ2Pw5FtHRoyYIuIyXX1L0+?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: ce6f47c8-90b6-451a-d882-08d8cdb1ee7e X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB3775.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Feb 2021 10:52:17.0619 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: zUSJOKxFcSN/ID+qWyvtwfk05xN611ZbTriMtcHMZxreaNby99G54BbBDC5Y7ipk X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3886 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 10.02.21 um 11:46 schrieb Mike Galbraith: > On Wed, 2021-02-10 at 11:34 +0100, Christian König wrote: >> What seems to happen here is that your system is low on resources and we >> just try to free up pages. > FWIW, box has oodles generic ram free right after boot. Then I have no idea what happens here. The returned pages are identical, only the overhead to allocate them is reduced significantly. The only other idea I have is that this somehow changes the timing and exposes a bug somewhere else. You could try to replace the "for (order = min(MAX_ORDER - 1UL, __fls(num_pages)); num_pages;" in ttm_pool_alloc() with "for (order = 0; num_pages;" to get the old behavior. Regards, Christian. > > -Mike >