linux-kernel - RE: [PATCH v5 08/12] x86/resctrl: Add sysfs interface to read mbm_local

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Message-ID: <IA1PR11MB609736EB0036405567A851649B559@IA1PR11MB6097.namprd11.prod.outlook.com>
Date:   Tue, 27 Sep 2022 22:42:17 +0000
From:   "Yu, Fenghua" <fenghua.yu@...el.com>
To:     Babu Moger <babu.moger@....com>, "corbet@....net" <corbet@....net>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>
CC:     "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "paulmck@...nel.org" <paulmck@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "quic_neeraju@...cinc.com" <quic_neeraju@...cinc.com>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "damien.lemoal@...nsource.wdc.com" <damien.lemoal@...nsource.wdc.com>,
        "songmuchun@...edance.com" <songmuchun@...edance.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "jpoimboe@...nel.org" <jpoimboe@...nel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Bae, Chang Seok" <chang.seok.bae@...el.com>,
        "pawan.kumar.gupta@...ux.intel.com" 
        <pawan.kumar.gupta@...ux.intel.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "daniel.sneddon@...ux.intel.com" <daniel.sneddon@...ux.intel.com>,
        "sandipan.das@....com" <sandipan.das@....com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "james.morse@....com" <james.morse@....com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "Eranian, Stephane" <eranian@...gle.com>
Subject: RE: [PATCH v5 08/12] x86/resctrl: Add sysfs interface to read
 mbm_local_bytes event configuration

Hi, Babu,

> By default, the mbm_local_bytes configuration is set to 0x15 to count all the
> local event types. The event configuration settings are domain specific.
> Changing the configuration on one CPU in a domain would affect the whole
> domain.
> 
> For example:
>     $cat /sys/fs/resctrl/info/L3_MON/mbm_local_config
>     0:0x15;1:0x15;2:0x15;3:0x15

Schemata has format: "id0=val0;id1=val1;...". Maybe it's better to use
similar format here: 0=0x15;1=0x15;2=0x15;3=0x15? So we can have uniform formats across
resctrl.

Thanks.

-Fenghua