linux-kernel - Re: [PATCH v5 0/8] x86/resctrl: Miscellaneous resctrl features

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Message-ID: <cd69a5f1-63eb-70f7-9689-7d9b5b99ab62@amd.com>
Date:   Tue, 27 Jun 2023 09:26:06 -0500
From:   "Moger, Babu" <babu.moger@....com>
To:     "corbet@....net" <corbet@....net>,
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Subject: Re: [PATCH v5 0/8] x86/resctrl: Miscellaneous resctrl features

Gentle ping, Any comments on this series.
Thanks
Babu

> -----Original Message-----
> From: Moger, Babu <Babu.Moger@....com>
> Sent: Thursday, June 1, 2023 2:01 PM
> To: corbet@....net; reinette.chatre@...el.com; 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; Moger,
> Babu <Babu.Moger@....com>; chang.seok.bae@...el.com;
> pawan.kumar.gupta@...ux.intel.com; jmattson@...gle.com;
> daniel.sneddon@...ux.intel.com; Das1, Sandipan <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; pawan.kumar.gupta@...ux.intel.com;
> jarkko@...nel.org; adrian.hunter@...el.com; quic_jiles@...cinc.com;
> peternewman@...gle.com; Moger, Babu <Babu.Moger@....com>
> Subject: [PATCH v5 0/8] x86/resctrl: Miscellaneous resctrl features
> 
> 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. Moves the default control group creation during the mount instead of during
> init.
> 5. While doing these above changes, found that rftype flags needed some
> cleanup.
>    They were named inconsistently. Re-arranged them much more cleanly now
> and added
>    few comments.  Hope it can help future additions.
> 
> ---
> v5:
>    Changes since v4:
>    Moved the default group creation during mount instead of kernel init.
>    Tried to address most of the comments on commit log. Added more context
> and details.
>    Addressed feedback about the patch4. Removed the code changes and only
> kept the comments.
>    I am ok to drop patch4. But I will wait for the comment on that.
>    There were lots of comments. Hope I did not miss anything. Even if I missed, it
> is
>    not intentional.
> 
> 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. Addressed it by making
> these
>     files x86 specific.
>     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.
> 
> v3: Changes since v2
>     Still waiting for more comments. While waiting, addressed few comments
> from Fenghua.
>     Added few more texts in the documentation about multiple tasks assignment
> feature.
>     Added pid in last_cmd_status when applicable.
>     Introduced static resctrl_debug to save the debug option.
>     Few minor text changes.
> 
> v2: Changes since v1
>   a. Removed the changes to add the task's threads automatically. It required
>      book keeping to handle the failures and gets complicated. Removed that
> change
>      for now.
>   b. Added -o debug option to mount in debug mode(comment from Fenghua)
>   c. Added debug files rmid and closid. Stephane wanted to rename them more
>      generic to accommodate ARM. It kind of loses meaning if is renamed
> differently.
>      Kept it same for now. Will change if he feels strong about it.
> 
> v4:
> https://lore.kernel.org/lkml/168177435378.1758847.8317743523931859131.stg
> it@...ger-ubuntu/
> v3:
> https://lore.kernel.org/lkml/167778850105.1053859.14596357862185564029.st
> git@...ger-ubuntu/
> v2:
> https://lore.kernel.org/lkml/167537433143.647488.9641864719195184123.stgit
> @bmoger-ubuntu/
> v1:
> https://lore.kernel.org/lkml/167278351577.34228.12803395505584557101.stgit
> @bmoger-ubuntu/
> 
> Babu Moger (8):
>       x86/resctrl: Add multiple tasks to the resctrl group at once
>       x86/resctrl: Simplify rftype flag definitions
>       x86/resctrl: Rename rftype flags for consistency
>       x86/resctrl: Add comments on RFTYPE flags hierarchy
>       x86/resctrl: Introduce "-o debug" mount option
>       x86/resctrl: Display CLOSID and RMID for the resctrl groups
>       x86/resctrl: Move default control group creation during mount
>       x86/resctrl: Introduce RFTYPE_DEBUG flag
> 
> 
>  Documentation/arch/x86/resctrl.rst     |  19 ++-
>  arch/x86/kernel/cpu/resctrl/internal.h |  66 ++++++--
> arch/x86/kernel/cpu/resctrl/rdtgroup.c | 199 +++++++++++++++++--------
>  3 files changed, 212 insertions(+), 72 deletions(-)
> 
> --