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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <SJ1PR11MB60830E546B3D575B01D37104FC202@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Thu, 7 Mar 2024 17:18:11 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: "Wieczor-Retman, Maciej" <maciej.wieczor-retman@...el.com>
CC: "Yu, Fenghua" <fenghua.yu@...el.com>, "Chatre, Reinette"
	<reinette.chatre@...el.com>, Shuah Khan <shuah@...nel.org>,
	"james.morse@....com" <james.morse@....com>, "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

>>If so, what should it be named? "snc_ways" as a kernel variable was
>>later replaced by "snc_nodes_per_l3_cache". Is that a good filename?
>
> "snc_nodes_per_l3_cache" seems okay to me.
>
> And I understand that the file content would show SNC mode and the presence or
> absence of this file would tell if kernel supports SNC?

Yes. The existence of the file indicates the kernel is SNC aware.

The value read from the file would give the number of nodes per L3 (obviously :-) )

SNC not supported by this platform or not enabled:

$ cat /sys/fs/resctrl/info/L3_mon/ snc_nodes_per_l3_cache
1

SNC2 enabled:

$ cat /sys/fs/resctrl/info/L3_mon/ snc_nodes_per_l3_cache
2

etc.

-Tony