Received-SPF: pass (google.com: domain of linux-kernel+bounces-106697-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
Message-ID: <176e6031-c95f-4c75-9857-5f8fe6c4e67a@intel.com>
Date: Mon, 18 Mar 2024 14:26:25 -0700
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH 4/4] selftests/resctrl: Adjust SNC support messages
Content-Language: en-US
To: "Luck, Tony" <tony.luck@intel.com>, James Morse <james.morse@arm.com>
CC: "Wieczor-Retman, Maciej" <maciej.wieczor-retman@intel.com>, "Yu, Fenghua"
	<fenghua.yu@intel.com>, Shuah Khan <shuah@kernel.org>,
	"ilpo.jarvinen@linux.intel.com" <ilpo.jarvinen@linux.intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-kselftest@vger.kernel.org" <linux-kselftest@vger.kernel.org>
References: <SJ1PR11MB608310C72D7189C139EA6302FC212@SJ1PR11MB6083.namprd11.prod.outlook.com>
 <SJ1PR11MB60830E546B3D575B01D37104FC202@SJ1PR11MB6083.namprd11.prod.outlook.com>
 <159474e6-ef11-4769-a182-86483efcf2a6@intel.com>
 <SJ1PR11MB60832DAD58E864F99A16FCC4FC202@SJ1PR11MB6083.namprd11.prod.outlook.com>
 <0393c4ce-7e41-4dcc-940a-a6bea9437970@intel.com>
 <SJ1PR11MB6083AACB10645E41DD3F9639FC202@SJ1PR11MB6083.namprd11.prod.outlook.com>
 <55a55960-8bb1-4ce2-a2c7-68e167da8bcc@intel.com>
 <ZepK4mtoV_J8-UbE@agluck-desk3>
 <eacdc287-24bd-4137-85c8-df055cfd78b1@arm.com>
 <ZetcM9GO2PH6SC0j@agluck-desk3>
 <88430722-67b3-4f7d-8db2-95ee52b6f0b0@arm.com>
 <47c28b3d-3b90-4b33-ba71-1e359d43238e@intel.com>
 <SJ1PR11MB60832422CBDCCDA580010769FC2D2@SJ1PR11MB6083.namprd11.prod.outlook.com>
 <6948784d-6a20-435a-8781-30f324bed472@intel.com>
 <SJ1PR11MB608303C5E0BEB42CAC5B02BAFC2D2@SJ1PR11MB6083.namprd11.prod.outlook.com>
 <SJ1PR11MB6083FAA69AF7F712B34CA292FC2D2@SJ1PR11MB6083.namprd11.prod.outlook.com>
From: Reinette Chatre <reinette.chatre@intel.com>
In-Reply-To: <SJ1PR11MB6083FAA69AF7F712B34CA292FC2D2@SJ1PR11MB6083.namprd11.prod.outlook.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8bit
Precedence: bulk
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?N1gvbmxuMFlReG9VQ2YxcEZvNjdFN2lJRmZwakhHMGtSSUd2aUpsNi9nREtS?=
 =?utf-8?B?OU9YUlRodW16c1FLZUlOWmd6MUtJSW9BUk1uaVd2Z3BlaE5XRVBsZW5GTmxC?=
 =?utf-8?B?SDF0T0srWjBkdmpNS01DekhieGc3OC96emhiVEZ6RmVkYzlwOGUrVnRoZFQ2?=
 =?utf-8?B?ODU0bUZ3UzVVMkwvaEZqaTRXYzl2SHZkbGZCY2RSTjJCdTVkbFl2cTYxZmhQ?=
 =?utf-8?B?d1ZuUUJDMkZ3ZURDOFZ2QWRnZ21qbVVIckQxczRZazlDaXpXVXRhYmhLdlBq?=
 =?utf-8?B?bnlVcDcrOXNEQTJBdm12cWl4eWZiMktiS0M2ZC83NHV6UkdIa2VjL2JyZ3lp?=
 =?utf-8?B?bTlMSFVocjVOS2M3WVpnT2h6ajBBbzVvMTlhMXlDb0pMc0pxYjFVWG9KZnYv?=
 =?utf-8?B?eFNBRDNVbXlad2RWbSthWDJxMVlIRlhkaENOR0k0dDlyVmNadVVoVHB5NFk3?=
 =?utf-8?B?bDNSdFNndXNCNEs1MHB6bHNrdHZIN1JVVXRtcXhjaUF2QWxldTM5UEpNYk4y?=
 =?utf-8?B?UGtVOUZBN0FIZFZUTE5POFlsWDFRc01Lc2dTZ3lISEtlMFhPYmtnMG9VRDNW?=
 =?utf-8?B?TnVlaHVLVkZqS1J4SGdYMWF3MEtTRG0zckRKdHdNTnZmaFhSTlZYS2tQandM?=
 =?utf-8?B?S2NKNWdXTGkxN1lkekxkTTJQZGIxbGVZTUNka2tWMDgxQS9XWTRPcjdjOVRQ?=
 =?utf-8?B?RGtxYk1XWGxXbGViZjRXWHgxSWxDY0FIRE83dE1QMGNTQ3ZiQ1BEWGhoc3Vj?=
 =?utf-8?B?OGRYeStkQzhlTHNwdE5RL1FiZThZcGNOZmxRejFjbjRWaUZYdUJaNXBkQmd1?=
 =?utf-8?B?YUtoeE9KTHVxdHJ6Q015bkZPK1QvODloY1MzaWZHRDVKczV5OUNSM3QrZUt5?=
 =?utf-8?B?bDIrc1RGYW52aXlPazZiUnBSSWJZT2VrenJsekFhUzlMUkdjTHJ5cGpzWFJL?=
 =?utf-8?B?NGpEclFxUmJ0YmN5RDBJN1FqbmcyNVdiZ2hHWDdDQyszWjVBb3N4eEhZaVZ6?=
 =?utf-8?B?cEdQNGVtcWVXcU8xV3pBUVNnRkZyNFlKUUQ5ei96Y05kOTFMT2d3YWV0UzhK?=
 =?utf-8?B?eW02aVBkajc3dVlmMzhEMTNWZEtuUHlkbjU1NlZDNnFrREFUS1FrMWVKZHJS?=
 =?utf-8?B?UjdmeFFVVGZwU2hDQzBjaWxXU0xiNjFxMUpQdi9EeUFJcEUyZ2ppdkhKTjhv?=
 =?utf-8?B?S1djem9qN3A0N2EyVmdHY0Q4YVNOcE1VNlJMVzRxaWdqbEd3cWR1SzNMLzZj?=
 =?utf-8?B?UGt3cTNPa0YraGhMeTF1cnJIN1FIL3daN3A1aENxQ05RakRLN2VsNW14MFBO?=
 =?utf-8?B?SmtPanVHeVBwaG9DSEI2QnQwQUpHaVkyK1JSZzFWTWpPR3A0eE0wcXY4QWpt?=
 =?utf-8?B?NnNIRlpXbksyZDZvVktRK0QyejU4OGdNL3JrcG9NbW9FQnhsMm5PcitYWmxI?=
 =?utf-8?B?WjRiQWpOc2FSNDBRSy83VUtnS1ZjaXpyRUlycTdrVmcweEpURk1MTzErbml5?=
 =?utf-8?B?azJGYnhxRzV3WDVLWGJOb0VXWjBQVHlzRDF1QmJZcWw4ZVo1OGVvc1d0MHlV?=
 =?utf-8?B?Mk84aTMyM2dZT1IrREF0Ykdqc2xmZmtxVFEzc3JvcGpyZVUydkVFbGZxckdw?=
 =?utf-8?B?OUgwcFN3bVVvOG1oWGo1RXZ4dnVXNjUrcVJrVE5Ia01hNDFvc2dhZ2swRzA1?=
 =?utf-8?B?aStpbTh2aVNoOG9mb3JuNXlmVjQrWXgxRjF6NjREallER2NFV0xndUVpaEFS?=
 =?utf-8?B?MGE2RDZlTkorUzhvajVSdmFqU2Fad00xMlREQk5oWWJyQWFjRHhMQ0oyWkho?=
 =?utf-8?B?Vmlvb3RvY2xzaFQzZnNaVkhFWVU1OWtuS1dGYnJDZk5lUE1GNzNaSDlOMzRu?=
 =?utf-8?B?OU9OcC81KzVKdEhPNFBmWHNsSU51WTFPZDdhMjR1K2ErYnZucEI5aXV2UzV3?=
 =?utf-8?B?ZUZ4TnpsWHVkTWVldnBXVE1TZjVyWi9KdjBCd1lycGpyK2JuOHMrRUJBYjZq?=
 =?utf-8?B?Vm90R2IzbDAwdnBYRytsSlRDYm9zY0I3UnE1cTZDdDhPVUtsNENvRHB2YkxL?=
 =?utf-8?B?Y1lwRW1TZUhpWnp6UnZKV3lWeTJRY010b3Azd1A5VXJhSlZhWThFbmJSeXFk?=
 =?utf-8?B?ZzZoV1JoN0pTeURlbTk5ZWIxVDVDQlFxSDNYb3JZNDBVZ2Y3aXNnWm9hNnFp?=
 =?utf-8?B?bUE9PQ==?=
X-MS-Exchange-CrossTenant-Network-Message-Id: 58ca368c-16ce-40af-670c-08dc47921200
X-MS-Exchange-CrossTenant-AuthSource: SJ2PR11MB7573.namprd11.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Mar 2024 21:26:27.4100
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: 5WaEajYCO5JKZ/UKZ3IUcDxOjRRvay2jpPL++TYk+f5ZvxMV8mzqEnit/TYRP7MoRavzdRN+9pvBHIQPsBq/IW2/HtIpUJF4L3Wykp8bBsM=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR11MB5877
X-OriginatorOrg: intel.com


On 3/18/2024 2:04 PM, Luck, Tony wrote:
>>> What is the use case for needing to expose the individual cluster counts? What if
>>> resctrl just summed the cluster counts and presented the data as before - per L3
>>> cache instance? I doubt that resctrl would be what applications would use to verify
>>> whether they are "well behaved" wrt NUMA.
>>
>> Reinette,
>>
>> My (perhaps naïve) belief is that in a cloud server environment there are many
>> well behaved NUMA applications. Only presenting the sum would lose the detailed
>> information from each SNC node.
> 
> Is the answer to "A" or "B" ... why not provide both:
> 
> $ ls -l /sys/fs/resctrl/mon_data
> total 0
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_L3_00
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_L3_01
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_NODE_00
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_NODE_01
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_NODE_02
> dr-xr-xr-x. 2 root root 0 Mar 18 14:01 mon_NODE_03
> 
> The "L3" entries provide the sum across all SNC nodes sharing the cache. The NODE ones
> give the broken out counts.

Perhaps ... in this case it may make things easier to understand if
those "mon_NODE_*" directories are sub-directories of the appropriate
"mon_L3_*" directories. 

Reinette