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X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jul 2026 14:46:49.0152 (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: mhWHVk9BVWaxjPiXQvHtp3EqlaqMYrXi/96zgp702QUy/kkb4SJy9KGTxIqtvEpSTSAb/Tn6KRPmozwzmnu5Q0HjZujepatASodUj8Ryj+M= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR11MB8323 X-OriginatorOrg: intel.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260702_074659_664157_6811A922 X-CRM114-Status: GOOD ( 23.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Ben, On 7/2/26 2:20 AM, Ben Horgan wrote: > On 7/1/26 23:38, Reinette Chatre wrote: >> On 5/20/26 2:24 PM, Ben Horgan wrote: ... >>> --- a/Documentation/arch/arm64/mpam.rst >>> +++ b/Documentation/arch/arm64/mpam.rst >>> @@ -65,6 +65,23 @@ The supported features are: >>> there is at least one CSU monitor on each MSC that makes up the L3 group. >>> Exposing CSU counters from other caches or devices is not supported. >>> >>> +* Memory Bandwidth Usage (MBWU) on or after the L3 cache. resctrl uses the >>> + L3 cache-id to identify where the memory bandwidth is measured. For this >>> + reason the platform must have an L3 cache with cache-id's supplied by >>> + firmware. (It doesn't need to support MPAM.) >>> + >>> + Memory bandwidth monitoring makes use of MBWU monitors in each MSC that >>> + makes up the L3 group. If the memory bandwidth monitoring is on the memory >>> + rather than the L3 then there must be a single global L3 as otherwise it >>> + is unknown which L3 the traffic came from. >>> + >>> + To expose 'mbm_total_bytes', the topology of the group of MSC chosen must >>> + match the topology of the L3 cache so that the cache-id's can be >>> + repainted. For example: Platforms with Memory bandwidth monitors on >>> + CPU-less NUMA nodes cannot expose 'mbm_total_bytes' as these nodes do not >>> + have a corresponding L3 cache. 'mbm_local_bytes' is not exposed as MPAM >>> + cannot distinguish local traffic from global traffic. >> >> Hopefully we can get to a point where memory bandwidth monitoring data from >> CPU-less NUMA nodes can be exposed via resctrl. When considering such possible > > Thank you for your interest here. I hope so too. > >> future I think it may make this work easier to build on if the documentation >> focuses on what the current implementation supports and leave room for >> future enhancements by not constraining user space expectation with an absolute >> like "CPU-less NUMA nodes cannot expose 'mbm_total_bytes'". > > The intention was to describe the current limitations but I do see how > this can come across as fundamental problems rather than just that we > need to do some more work to establish how this can be done and > implement it. > > How about if I add this paragraph at the end? > > All these restrictions based on L3 cache are due to resctrl, currently, > only supporting monitoring at the scope of the L3 scope. It is expected How about "at L3 scope" instead of "at the scope of the L3 scope"? > that going forward more MBWU monitors can be exposed to the user after > support for more monitoring scopes is added to resctrl. Looks good to me, thank you. Reinette