linux-kernel - RE: resctrl2

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Message-ID: <SJ1PR11MB6083BC6B330FA7B7DFD3E76AFCE3A@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date:   Fri, 25 Aug 2023 18:09:44 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Chatre, Reinette" <reinette.chatre@...el.com>,
        Amit Singh Tomar <amitsinght@...vell.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "james.morse@....com" <james.morse@....com>,
        George Cherian <gcherian@...vell.com>,
        "robh@...nel.org" <robh@...nel.org>,
        "peternewman@...gle.com" <peternewman@...gle.com>,
        Drew Fustini <dfustini@...libre.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: resctrl2 - status

> Alternatively, can user space just take a "load all resctrl modules
> and see what sticks" (even modules of different architectures since
> a user space may want to be generic) approach? 

This mostly works. Except for the cases where different modules access
the same underlying hardware, so can't be loaded together.

Examples:

rdt_l3_cat vs. rdt_l3_cdp - user needs to decide whether they want CDP or not.
But this is already true ... they have to decide whether to pass the "-o cdp" option
to mount.

rdt_l3_mba vs. rdt_l3_mba_MBps - does the user want to control memory bandwidth
with percentages, or with MB/sec values. Again the user already has to make this
decision when choosing mount options.

Maybe the "What resctrl options does this machine support?" question would be
best answered with a small utility?

-Tony