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Tue, 3 Dec 2024 03:49:24 +0000 Message-ID: <220a2fb4-26aa-4491-a58b-9a3e0b22353a@intel.com> Date: Mon, 2 Dec 2024 19:49:22 -0800 User-Agent: Mozilla Thunderbird Subject: Re: resctrl mount fail on v6.13-rc1 To: Ming Lei , "Luck, Tony" CC: Fenghua Yu , Peter Newman , Babu Moger , , "x86@kernel.org" References: <868b451a-fdba-4b45-bff1-9ac1023080c8@intel.com> Content-Language: en-US From: Reinette Chatre In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4P222CA0002.NAMP222.PROD.OUTLOOK.COM (2603:10b6:303:114::7) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|BN9PR11MB5289:EE_ X-MS-Office365-Filtering-Correlation-Id: 9fd6f967-d4ab-4520-6528-08dd134d7a54 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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Enable X86_CPU_RESCTRL config option. > ok 1 selftests: resctrl: resctrl_tests # SKIP > make: Leaving directory '/root/git/linux/tools/testing/selftests' > > [linux]# grep X86_CPU_RESCTRL .config > CONFIG_X86_CPU_RESCTRL=y > > Can you share how to make /sys/fs/resctrl so that I can check if the > recent changes in block tree can avoid this warning? Thank you very much for taking a look. You may not be testing on hardware supported by resctrl. A /proc/cpuinfo flag bit that indicates hardware supported by resctrl is "rdt_a". When booting a kernel compiled with CONFIG_X86_CPU_RESCTRL=y on such hardware dmesg will contain information like: resctrl: L3 allocation detected resctrl: MB allocation detected resctrl: L3 monitoring detected > >>>> >>>> There are only trivial changes to the resctrl code between >>>> v6.12 (which works) and v6.13-rc1: >>>> >>>> $ git log --oneline v6.13-rc1 ^v6.12 -- arch/x86/kernel/cpu/resctrl >>>> 5a4b3fbb4849 Merge tag 'x86_cache_for_v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip >>>> 9bce6e94c4b3 x86/resctrl: Support Sub-NUMA cluster mode SNC6 >>>> 29eaa7958367 x86/resctrl: Slightly clean-up mbm_config_show() >>>> >>>> So something in kernfs? Or the way resctrl uses kernfs? >>> >>> I am not seeing this but that may be because I am not testing with >>> selinux enabled. My test kernel has: >>> # CONFIG_SECURITY_SELINUX is not set >>> >>> I am also not running with any btrfs filesystems. >>> >>> Is this your usual setup in which you are seeing this the first time? Is it >>> perhaps possible for you to bisect? >> >> Bisection says: >> >> $ git bisect bad >> f1be1788a32e8fa63416ad4518bbd1a85a825c9d is the first bad commit >> commit f1be1788a32e8fa63416ad4518bbd1a85a825c9d >> Author: Ming Lei >> Date: Fri Oct 25 08:37:20 2024 +0800 >> >> block: model freeze & enter queue as lock for supporting lockdep >> >>> >>> The subject states "resctrl mount fail" - could you please confirm if >>> resctrl cannot be mounted in addition to the lockdep warning? > > It seems one lockdep false positive, but it shouldn't cause 'resctrl > mount fail', I will take a look at the lock chains and see if some of > them can be cut. Tony confirmed [1] in follow-up message that resctrl mount succeeded despite the lockdep notice. Reinette [1] https://lore.kernel.org/all/Z0441XN_KoCP-fNz@agluck-desk3/