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

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Date:   Wed, 27 Sep 2023 16:34:00 -0500
From:   "Moger, Babu" <bmoger@....com>
To:     Reinette Chatre <reinette.chatre@...el.com>,
        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,
        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,

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

>
>> 3. RFTYPE_BASE | RFTYPE_MON : Files only for MON groups
> Same here.

How bout?

3. RFTYPE_BASE | RFTYPE_MON : Files for the MON groups

>
>> 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.


>   
>> Signed-off-by: Babu Moger <babu.moger@....com>
>> ---
> I only have feedback about the changelog. The patch looks good to me.

Thanks

Babu