linux-kernel - Re: [RFC v2 PATCH 6/7] x86/resctrl: Display the RMID and COSID for resctrl groups

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Date:   Fri, 17 Feb 2023 11:39:02 -0600
From:   "Moger, Babu" <bmoger@....com>
To:     Fenghua Yu <fenghua.yu@...el.com>, Babu Moger <babu.moger@....com>,
        reinette.chatre@...el.com
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        corbet@....net, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, eranian@...gle.com,
        peternewman@...gle.com
Subject: Re: [RFC v2 PATCH 6/7] x86/resctrl: Display the RMID and COSID for
 resctrl groups


On 2/16/2023 7:46 PM, Fenghua Yu wrote:
> Hi, Babu,
>
> On 2/2/23 13:47, Babu Moger wrote:
>> When a user creates a control or monitor group, the CLOSID or RMID
>> are not visible to the user. These are architecturally defined entities.
>> There is no harm in displaying these in resctrl groups. Sometimes it
>> can help to debug the issues.
>>
>> Add CLOSID and RMID to the control/monitor groups display in resctrl
>> interface.
>>
>> $cat /sys/fs/resctrl/clos1/closid
>> 1
>> $cat /sys/fs/resctrl/mon_groups/mon1/rmid
>> 3
>>
>> Signed-off-by: Babu Moger <babu.moger@....com>
>> ---
>>   Documentation/x86/resctrl.rst          |   17 ++++++++++++
>>   arch/x86/kernel/cpu/resctrl/rdtgroup.c |   44 
>> ++++++++++++++++++++++++++++++++
>>   2 files changed, 61 insertions(+)
>>
>> diff --git a/Documentation/x86/resctrl.rst 
>> b/Documentation/x86/resctrl.rst
>> index 2c013c5d45fd..de332c242523 100644
>> --- a/Documentation/x86/resctrl.rst
>> +++ b/Documentation/x86/resctrl.rst
>> @@ -321,6 +321,15 @@ All groups contain the following files:
>>       Just like "cpus", only using ranges of CPUs instead of bitmasks.
>>     +"rmid":
>> +        Available only with debug option.Reading this file shows the
>> +        resource monitoring id (RMID) for monitoring the resource
>
> Capitals Resource Monitoring ID (RMID).
Sure.
>
>> +        utilization. Monitoring is performed by tagging each core(or
>> +        thread) or process via a Resource Monitoring ID (RMID). Kernel
>
> s/Resource Monitoring ID (RMID)/RMID/

Sure.

Thanks

Babu