Re: [PATCH 4/4] selftests/resctrl: Adjust SNC support messages

[Reinette Chatre]

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