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Fri, 7 Nov 2025 01:24:05 +0000 From: Aaron Tomlin To: tony.luck@intel.com, reinette.chatre@intel.com, Dave.Martin@arm.com, james.morse@arm.com, babu.moger@amd.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com Cc: dave.martin@arm.com, linux-kernel@vger.kernel.org Subject: [PATCH 0/2] x86/resctrl: Add io_alloc_min_cbm_all interface for CBM reset Date: Thu, 6 Nov 2025 20:23:59 -0500 Message-ID: <20251107012401.224515-1-atomlin@atomlin.com> X-Mailer: git-send-email 2.51.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BN9PR03CA0057.namprd03.prod.outlook.com (2603:10b6:408:fb::32) To CWLP123MB3523.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:70::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: CWLP123MB3523:EE_|LO0P123MB6922:EE_ X-MS-Office365-Filtering-Correlation-Id: 7fc075b5-ab2a-4f95-70c8-08de1d9c5747 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|1800799024; 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This proposal introduces a new resctrl interface file, "io_alloc_min_cbm_all", to provide users with a clean, unified mechanism for resetting I/O allocation CBMs. Previously, resetting all relevant CBMs to their minimum (cleared) configuration required userspace to perform multiple sequential writes to "io_alloc_cbm". By writing a zero (0) value to "io_alloc_min_cbm_all", the user can now force all corresponding CBMs back to their minimum size in a single operation, greatly simplifying automation and management tasks. Please let me know your thoughts. [1]: https://lore.kernel.org/lkml/cover.1761844489.git.babu.moger@amd.com/#b Aaron Tomlin (2): x86/resctrl: Add io_alloc_min_cbm_all interface for CBM reset fs/resctrl: resctrl: Return -EINVAL for a missing seq_show implementation Documentation/filesystems/resctrl.rst | 13 +++ arch/x86/kernel/cpu/resctrl/core.c | 2 +- arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 23 +++-- fs/resctrl/ctrlmondata.c | 117 ++++++++++++++++++---- fs/resctrl/internal.h | 3 + fs/resctrl/rdtgroup.c | 13 ++- include/linux/resctrl.h | 30 +++++- 7 files changed, 167 insertions(+), 34 deletions(-) -- 2.51.0