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Wed, 5 Feb 2025 23:17:31 +0000 Message-ID: <6376ea35-4ce7-4ac1-967b-97f2728228e3@intel.com> Date: Wed, 5 Feb 2025 15:17:28 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 08/23] x86/resctrl: Introduce interface to display number of monitoring counters To: Babu Moger , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , References: <80457612b98078bd7786c73f83775e4de86c699e.1737577229.git.babu.moger@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <80457612b98078bd7786c73f83775e4de86c699e.1737577229.git.babu.moger@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW2PR16CA0059.namprd16.prod.outlook.com (2603:10b6:907:1::36) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|CY8PR11MB7779:EE_ X-MS-Office365-Filtering-Correlation-Id: d2e8d144-9d9a-458a-1111-08dd463b4413 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|7416014|376014|366016|1800799024|7053199007; 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Number of assignments depend on number of > monitoring counters available. > > Provide the interface to display the number of monitoring counters > supported. The resctrl file 'num_mbm_cntrs' is visible to user space > when the system supports mbm_cntr_assign mode. > > Signed-off-by: Babu Moger > --- ... > diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst > index b5defc5bce0e..31ff764deeeb 100644 > --- a/Documentation/arch/x86/resctrl.rst > +++ b/Documentation/arch/x86/resctrl.rst > @@ -283,6 +283,22 @@ with the following files: > "mbm_total_bytes" or "mbm_local_bytes" will report 'Unavailable' if > there is no counter associated with that event. > > +"num_mbm_cntrs": > + The number of monitoring counters available for assignment when the > + system supports mbm_cntr_assign mode. > + :: > + > + # cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs > + 32 > + > + The resctrl file system supports tracking up to two memory bandwidth > + events per monitoring group: mbm_total_bytes and/or mbm_local_bytes. > + Up to two counters can be assigned per monitoring group, one for each > + memory bandwidth event. More monitoring groups can be tracked by > + assigning one counter per monitoring group. However, doing so limits > + memory bandwidth tracking to a single memory bandwidth event per > + monitoring group. > + This text needs an update to reflect the switch to per-domain counter assignment. Reinette