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Thu, 20 Feb 2025 05:54:57 +0000 Message-ID: <67ef5b80-cafb-4e04-a66a-5f361a3d4f85@intel.com> Date: Wed, 19 Feb 2025 21:54:54 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 40/42] fs/resctrl: Add boiler plate for external resctrl code To: James Morse , , CC: Thomas Gleixner , Ingo Molnar , Borislav Petkov , H Peter Anvin , Babu Moger , , "D Scott Phillips OS" , , , , , , Jamie Iles , Xin Hao , , , , David Hildenbrand , Rex Nie , "Dave Martin" , Koba Ko , Shanker Donthineni , Shaopeng Tan , "Tony Luck" References: <20250207181823.6378-1-james.morse@arm.com> <20250207181823.6378-41-james.morse@arm.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20250207181823.6378-41-james.morse@arm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0129.namprd04.prod.outlook.com (2603:10b6:303:84::14) 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_|SA0PR11MB4573:EE_ X-MS-Office365-Filtering-Correlation-Id: f7a66190-805c-4de5-dbef-08dd51731b10 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|366016|7053199007; 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Add ARCH_HAS_CPU_RESCTRL > for the common parts of the resctrl interface and make X86_CPU_RESCTRL > select this. > > Adding an include of asm/resctrl.h to linux/resctrl.h allows the > /fs/resctrl files to switch over to using this header instead. > > Co-developed-by: Dave Martin > Signed-off-by: Dave Martin > Signed-off-by: James Morse > Tested-by: Carl Worth # arm64 > Tested-by: Shaopeng Tan > Reviewed-by: Shaopeng Tan > Reviewed-by: Tony Luck > --- ... > diff --git a/fs/resctrl/Kconfig b/fs/resctrl/Kconfig > new file mode 100644 > index 000000000000..229ca71a8258 > --- /dev/null > +++ b/fs/resctrl/Kconfig > @@ -0,0 +1,37 @@ > +config RESCTRL_FS > + bool "CPU Resource Control Filesystem (resctrl)" > + depends on ARCH_HAS_CPU_RESCTRL > + select KERNFS > + select PROC_CPU_RESCTRL if PROC_FS > + help > + Some architectures provide hardware facilities to group tasks and > + monitor and control their usage of memory system resources such as > + caches and memory bandwidth. Examples of such facilities include > + Intel's Resource Director Technology (Intel(R) RDT) and AMD's > + Platform Quality of Service (AMD QoS). > + > + If your system has the necessary support and you want to be able to > + assign tasks to groups and manipulate the associated resource > + monitors and controls from userspace, say Y here to get a mountable > + 'resctrl' filesystem that lets you do just that. > + > + If nothing mounts or prods the 'resctrl' filesystem, resource > + controls and monitors are left in a quiescent, permissive state. > + > + On architectures where this can be disabled independently, it is > + safe to say N. > + > + See for more information. > + > +config RESCTRL_FS_PSEUDO_LOCK > + bool > + help > + Software mechanism to pin data in a cache portion using > + micro-architecture specific knowledge. > + > +config RESCTRL_RMID_DEPENDS_ON_CLOSID > + bool > + help > + Enabled by the architecture when the RMID values depend on the CLOSID. > + This causes the CLOSID allocator to search for CLOSID with clean > + RMID. With RESCTRL_FS_PSEUDO_LOCK and RESCTRL_RMID_DEPENDS_ON_CLOSID appearing at same level as RESCTRL_FS all three configs "depends on MISC_FILESYSTEMS". Should RESCTRL_FS_PSEUDO_LOCK and RESCTRL_RMID_DEPENDS_ON_CLOSID "depends on RESCTRL_FS" instead? Reinette