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

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Message-ID: <176e6031-c95f-4c75-9857-5f8fe6c4e67a@intel.com>
Date: Mon, 18 Mar 2024 14:26:25 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: "Luck, Tony" <tony.luck@...el.com>, James Morse <james.morse@....com>
CC: "Wieczor-Retman, Maciej" <maciej.wieczor-retman@...el.com>, "Yu, Fenghua"
	<fenghua.yu@...el.com>, Shuah Khan <shuah@...nel.org>,
	"ilpo.jarvinen@...ux.intel.com" <ilpo.jarvinen@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 4/4] selftests/resctrl: Adjust SNC support messages



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