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

From: Luck, Tony
Date: Mon Mar 18 2024 - 17:04:25 EST


> > 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.

-Tony