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

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Message-ID: <71ca01ad-e563-3ac3-815d-0bbc3814ed6f@intel.com>
Date:   Thu, 29 Sep 2022 15:10:25 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Babu Moger <babu.moger@....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 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?

>    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.

Reinette