linux-kernel - Re: [PATCH v4 0/7] x86/resctrl: Miscellaneous resctrl features

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Date:   Thu, 4 May 2023 11:54:20 -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>, <christophe.leroy@...roup.eu>,
        <jarkko@...nel.org>, <adrian.hunter@...el.com>,
        <quic_jiles@...cinc.com>, <peternewman@...gle.com>
Subject: Re: [PATCH v4 0/7] x86/resctrl: Miscellaneous resctrl features

Hi Babu,

On 4/17/2023 4:33 PM, Babu Moger wrote:
> These series adds support few minor features.
> 1. Support assigning multiple tasks to control/mon groups in one command.
> 2. Add debug mount option for resctrl interface.
> 3. Add RMID and CLOSID in resctrl interface when mounted with debug option.
> 4. While doing these above changes, found that rftype flags needed some cleanup.
>    They were named inconsistently. Re-arranged them much more cleanly now.
>    Hope it can help future additions.
> 
> ---
> v4: Changes since v3
>     Addressed comments from Reinette and others.
>     Removed newline requirement when adding tasks.
>     Dropped one of the changes on flags. Kept the flag names mostly same.
>     Changed the names of closid and rmid to ctrl_hw_id and mon_hw_id respectively.
>     James had some concerns about adding these files. But I thing it is big problem.
>     Please comment back if we can do better. 

>From what I understand the primary concern was the naming of the
files, which you address in this version. 

A second point I saw was a request for insight into why user space may need this
(James recommended obfuscation when value is only shared between kernel interfaces).
You did answer this in your response and since there was no follow-up I currently
assume that this has been answered.

Unless we hear otherwise from James I thus believe that his feedback is
addressed.

>     Tried to address Reinette's comment on patch 7. But due to current code design
>     I could not do it exact way. But changed it little bit to make it easy debug
>     file additions in the future.  

Could you please elaborate? It actually looks like you may be headed there next
according to:
https://lore.kernel.org/lkml/933d8ae2-d8b7-7436-5918-f639405c9ecb@amd.com/

Reinette