linux-kernel - Re: [PATCH v12 18/26] x86/resctrl: Add default MBM event configurations for mbm_cntr

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Message-ID: <eec98f44-f329-4dc2-b6b4-99bde056ff42@amd.com>
Date: Wed, 16 Apr 2025 12:27:52 -0500
From: "Moger, Babu" <babu.moger@....com>
To: Reinette Chatre <reinette.chatre@...el.com>, tony.luck@...el.com,
 peternewman@...gle.com
Cc: corbet@....net, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
 paulmck@...nel.org, akpm@...ux-foundation.org, thuth@...hat.com,
 rostedt@...dmis.org, ardb@...nel.org, gregkh@...uxfoundation.org,
 daniel.sneddon@...ux.intel.com, jpoimboe@...nel.org,
 alexandre.chartre@...cle.com, pawan.kumar.gupta@...ux.intel.com,
 thomas.lendacky@....com, perry.yuan@....com, seanjc@...gle.com,
 kai.huang@...el.com, xiaoyao.li@...el.com, kan.liang@...ux.intel.com,
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 sohil.mehta@...el.com, andrew.cooper3@...rix.com, mario.limonciello@....com,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 maciej.wieczor-retman@...el.com, eranian@...gle.com
Subject: Re: [PATCH v12 18/26] x86/resctrl: Add default MBM event
 configurations for mbm_cntr_assign mode

Hi Reinette,

On 4/16/25 11:18, Reinette Chatre wrote:
> Hi Babu,
> 
> On 4/15/25 11:48 AM, Moger, Babu wrote:
>> Hi Reinette,
>>
>> On 4/11/25 16:44, Reinette Chatre wrote:
>>> Hi Babu,
>>>
>>> On 4/3/25 5:18 PM, Babu Moger wrote:
>>>> By default, each resctrl group supports two MBM events: mbm_total_bytes
>>>> and mbm_local_bytes. To maintain the same level of support, two default
>>>> MBM configurations are added. These configurations will initially be used
>>>> to set up the counters upon mounting, while users will have the option to
>>>> modify them as needed.
>>>
>>> This jumps in quite fast by stating that MBM configurations are added but
>>> there is no definition of what an MBM configuration is.
>>
>> How about this?
>>
>>
>> By default, each resctrl group supports two MBM events: mbm_total_bytes
>> and mbm_local_bytes. These represent total and local memory bandwidth
>> monitoring, respectively. Each event corresponds to a specific MBM
>> configuration. Use these default configurations to set up the counters
>> during mount. Allow users to modify the configurations as needed after
>> initialization.
> 
> I am still missing a definition of "MBM configuration". How about:
> 
> "Each event corresponds to a specific MBM configuration." -> "Each event
> corresponds to an MBM configuration that specifies the bandwidth sources
> tracked by the event."

Sure.

> 
> ...
> 
>>>
>>> There seems more and more overlap with Tony's RMID work. Did you get a
>>> chance to look at that?
>>
>> Looked little bit. Will have look bit closer again.
> 
> I'll study that series next to catch up with Tony's plans.
> 
> Reinette
> 

-- 
Thanks
Babu Moger