linux-kernel - Re: [PATCH v5 12/12] Documentation/x86: Update resctrl

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Message-ID: <05f0ff0c-b328-46ac-c1fa-7aac09fbb9bc@amd.com>
Date:   Mon, 3 Oct 2022 09:28:18 -0500
From:   "Moger, Babu" <babu.moger@....com>
To:     Reinette Chatre <reinette.chatre@...el.com>, corbet@....net,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de
Cc:     fenghua.yu@...el.com, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, paulmck@...nel.org, akpm@...ux-foundation.org,
        quic_neeraju@...cinc.com, rdunlap@...radead.org,
        damien.lemoal@...nsource.wdc.com, songmuchun@...edance.com,
        peterz@...radead.org, jpoimboe@...nel.org, pbonzini@...hat.com,
        chang.seok.bae@...el.com, pawan.kumar.gupta@...ux.intel.com,
        jmattson@...gle.com, daniel.sneddon@...ux.intel.com,
        sandipan.das@....com, tony.luck@...el.com, james.morse@....com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        bagasdotme@...il.com, eranian@...gle.com
Subject: Re: [PATCH v5 12/12] Documentation/x86: Update resctrl_ui.rst for new
 features

Hi Reinette,

On 9/29/22 17:10, Reinette Chatre wrote:
> Hi Babu,
>
> In subject: resctrl_ui.rst -> resctrl.rst
>
> On 9/27/2022 1:27 PM, Babu Moger wrote:
>> Update the documentation for the new features:
>> 1. Slow Memory Bandwidth allocation (SMBA).
>>    With this feature, the QOS  enforcement policies can be applied
>>    to the external slow memory connected to the host. QOS enforcement
>>    is accomplished by assigning a Class Of Service (COS) to a processor
>>    and specifying allocations or limits for that COS for each resource
>>    to be allocated.
>>
>> 2. Bandwidth Monitoring Event Configuration (BMEC).
>>    The bandwidth monitoring events mbm_total_bytes and mbm_local_bytes
>>    are set to count all the total and local reads/writes respectively.
>>    With the introduction of slow memory, the two counters are not
>>    enough to count all the different types are memory events. With the
> types are memory events -> types of memory events?
Ok Sure
>
>>    feature BMEC, the users have the option to configure mbm_total_bytes
>>    and mbm_local_bytes to count the specific type of events.
>>
>> Also add configuration instructions with examples.
>>
>> Signed-off-by: Babu Moger <babu.moger@....com>
>> ---
> ...
>
>> +
>> +"mbm_total_config", "mbm_local_config":
>> +        These files contain the current event configuration for the events
>> +        mbm_total_bytes and mbm_local_bytes, respectively, when the
>> +        Bandwidth Monitoring Event Configuration (BMEC) feature is supported.
>> +        The event configuration settings are domain specific. Changing the
>> +        configuration on one CPU in a domain would affect the whole domain.
> This contradicts the implementation done in this series where the
> configuration is changed on every CPU in the domain.

How about this?

The event configuration settings are domain specific and will affect all the CPUs in the domain.

Thanks

Babu