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After all, we can already infer the "NODE" type from >> the schemata name "SMBA_NODE". > > I think that having an explicit declaration of the scope is probably > useful even for things that are included in the schema name. > > Part of the reason for describing the schema explicitly is because > inferring everything from the name does not feel scalable as we add > more different schemata and resource types. > OK, this makes sense. > Having said that, the schema names should still provide a good clue as > to what the schema represents. > > > I'm not sure that we should simply list possible domain IDs here: > > For MPAM, the domain IDs can be huge, random-looking numbers that do > not necessarily start from 0 (as currently implemented in the MPAM > driver). > > In any case, we need not just names for the individual domain IDs, but > an idea of what they represent. > > > Maybe we could stick with opaque "scope" names as in Reinette's > proposal, and solve the problem of enumating the domain IDs separately. > > > For the commonly-used scopes, we probably don't need to bother, since > the enumeration is available elsewhere: > > * for NUMA nodes and cache IDs, /sys/devices/system/node/node* > (or /sys/devices/system/node/possible) ? > > * for cache IDs at level , the set of values present in all the > files /sys/devices/system/cpu/cpu*/cache/index/id ? > Previously, the node list display was proposed mainly to build a connection between regions and nodes. If we know the node ID, we can check the detailed information of that node via sysfs (such as /sys/devices/system/node/node*). But I agree that keeping the "scope" simple and displaying the connection somewhere else is reasonable. >> >>> │ └── mbm_total_bytes >>> └── mon_NODE_01 <== monitoring data at scope NODE >>> └── mbm_total_bytes >>> >> >> Please let me take this chance to elaborate on region-aware RDT >> in more detail. I am wondering if the interface could be further >> extended to support this feature. >> [snip] >> Users could query the exact definition of REGION1 >> by checking the info directory. >> >> info >> └── MB >> └── resource_schemata >> ├── MB_REGION1_OPT >> │ ├── max >> │ ├── min >> │ ├── resolution >> │ ├── scale >> │ ├── scope <== "0=node2;1=node3" (node2 on S0, node3 on S1) >> │ ├── tolerance >> │ ├── type >> │ └── unit >> >> > > Hmmm, that's interesting. > > If there is a grouping on NUMA nodes, is that advertised anywhere in > sysfs already? > > Ideally, there would already be a definition of what "region 0" is in > terms of the NUMA topology, and we could just refer to it. > We have a sysfs interface exposed in /sys/firmware/acpi/memory_ranges/; each entry represents a physical address range with local or remote region IDs. I think we can build based on this interface. thanks, Chenyu