linux-kernel - Re: [PATCH v10 09/10] x86/resctrl: Add support for the files for MON groups only

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Message-ID: <37b999a7-d1a1-6158-f97f-ce8cc3276cc1@amd.com>
Date:   Mon, 2 Oct 2023 12:26:55 -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,
        christophe.leroy@...roup.eu, jarkko@...nel.org,
        adrian.hunter@...el.com, quic_jiles@...cinc.com,
        peternewman@...gle.com
Subject: Re: [PATCH v10 09/10] x86/resctrl: Add support for the files for MON
 groups only

Hi Reinette,
Forgot to respond to this.

On 9/27/23 17:02, Reinette Chatre wrote:
> Hi Babu,
> 
> On 9/27/2023 2:34 PM, Moger, Babu wrote:
>> Hi Reinette,
>>
>> On 9/27/2023 1:34 PM, Reinette Chatre wrote:
>>> Hi Babu,
>>>
>>> On 9/15/2023 3:42 PM, Babu Moger wrote:
>>>> There are 3 types resctrl root files.
>>> Considering patch #4, should this be "base"?
>> Sure.
>>>
>>>> 1. RFTYPE_BASE : Files common for both MON and CTRL groups
>>>> 2. RFTYPE_BASE | RFTYPE_CTRL : Files only for CTRL groups
>>> If (1) is accurate then I cannot see how (2) can be accurate.
>>
>> How about ?
>>
>> 2. RFTYPE_BASE | RFTYPE_CTRL : Files for the CTRL groups
> 
> Yes, this is accurate. Even so, this snippet does not seem
> necessary considering the changelog rewrite below.

Sure. Removed this whole snippet.

> 
>>
>>>
>>>> 3. RFTYPE_BASE | RFTYPE_MON : Files only for MON groups
>>> Same here.
>>
>> How bout?
>>
>> 3. RFTYPE_BASE | RFTYPE_MON : Files for the MON groups
> 
> Same comment.
> 
>>
>>>
>>>> Files only for the MON groups are not supported now. Add the
>>>> support to create these files.
>>> This is not accurate. Files "only for the MON groups" are
>>> actually the only monitor files that *are* supported. The
>>> problem being fixed here is that monitor files are
>>> not supported for CTRL_MON groups.
>>>
>>> I made an attempt at rewriting this commit message but I am
>>> doing it quite quickly so please do improve it:
>>>
>>>     Files unique to monitoring groups have the
>>>     RFTYPE_MON flag. When a new monitoring group is created
>>>     the resctrl files with flags RFTYPE_BASE (files common
>>>     to all resource groups) and RFTYPE_MON (files unique
>>>     to monitoring groups) are created to support interacting with
>>>     the new monitoring group.
>>>
>>>     A resource group can support both monitoring and control,
>>>     also termed a CTRL_MON resource group. CTRL_MON groups should
>>>     get both monitoring and control resctrl files but that
>>>     is not the case. Only the RFTYPE_BASE and RFTYPE_CTRL files
>>>     are created for    CTRL_MON groups. This is not a problem
>>>     because there are no monitoring specific files with the
>>>     RFTYPE_MON flag associated with resource groups.
>>>
>>>     A later patch introduces the first RFTYPE_MON file for
>>>     resource groups so fix resctrl file creation for CTRL_MON
>>>     groups to ensure that monitoring files,    those with the
>>>     RFTYPE_MON flag, are also created.
>>
>> Looks good with slight change(only last para. Rest looks good). Just removed the "fix".
>>
>> A later patch introduces the first RFTYPE_MON file for
>> resource groups. Add the changes to create the files for CTRL_MON
>> groups to ensure that monitoring files,    those with the RFTYPE_MON flag,
>> are also created.
>>
> 
> "Add the changes to" is not necessary. With this and removing the "fix" it
> can be summarized to:
> 	A later patch introduces the first monitoring specific (RFTYPE_MON)
> 	file for resource groups. Ensure that files with the RFTYPE_MON
> 	flag are created for CTRL_MON groups.
> 
> What do you think?
> 
Yes. Looks good.
-- 
Thanks
Babu Moger