linux-kernel - RE: [PATCH 3/7] x86/resctrl: Add a new node-scoped resource to rdt_resources

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Message-ID: <SJ1PR11MB6083EDF3CDD7C231CA05C0EAFCAC9@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date:   Tue, 28 Feb 2023 17:05:25 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Moger, Babu" <bmoger@....com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        Peter Newman <peternewman@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        "x86@...nel.org" <x86@...nel.org>
CC:     Shaopeng Tan <tan.shaopeng@...itsu.com>,
        James Morse <james.morse@....com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: RE: [PATCH 3/7] x86/resctrl: Add a new node-scoped resource to
 rdt_resources_all[]

Babu,

Thanks for looking at my patches.

> Do you really need a new resource [RDT_RESOURCE_NODE] to handle this 
> feature?

Yes. When sub-numa cluster mode is enabled, there are separate counts for
each "node" on the socket. This new resource is the key to creating extra
directories in the /sys/fs/resctrl/mon_data/ area so that the memory bandwidth
and cache occupancy can be read for each node, instead of just for each socket.

But there are some other issues with this patch series. New version will be posted
once they are fixed up.

-Tony