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From: Peter Newman <peternewman@google.com>
To: Amit Singh Tomar <amitsinght@marvell.com>
Cc: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,  fenghua.yu@intel.com,
	reinette.chatre@intel.com, james.morse@arm.com,
	 gcherian@marvell.com, robh@kernel.org
Subject: Re: [RFC 00/12] ARM: MPAM: add support for priority partitioning control
Date: Tue, 22 Aug 2023 11:01:08 +0200	[thread overview]
Message-ID: <CALPaoCh9LsUDz9320i9tvgte2+DoRvnr-RiAMJiudAVFM6AUGA@mail.gmail.com> (raw)
In-Reply-To: <20230815152712.1760046-1-amitsinght@marvell.com>

Hi Amit,

On Tue, Aug 15, 2023 at 5:27 PM Amit Singh Tomar <amitsinght@marvell.com> wrote:
> As an example, "schemata" file under resource control group contains information about
> cache portion bitmaps, and memory bandwidth allocation, and these are used to configure
> Cache portion partition (CPOR), and MPAM bandwidth partitioning controls.
>
> MB:0=0100
> L3:0=ffff
>
> But resctrl doesn't provide a way to set-up other control that ARM MPAM provides
> (For instance, Priority partitioning control as mentioned above). To support this,
> James has suggested to use already existing schemata to be compatible with
> portable software, and this is the main idea behind this RFC is to have some kind
> of discussion on how resctrl can be extended to support priority partitioning control.
>
> To support Priority partitioning control, "schemata" file is updated to accommodate
> priority field (upon priority partitioning capability detection), separated from CPBM
> using delimiter ",".
>
> L3:0=ffff,f where f indicates downstream priority max value.

Do we really have to mash two controls into the same schema? In the
CDP example, the code/data controls are presented as multiple schema,
for example: "L3CODE, L3DATA"

Especially when reading back the schemata file, it seems like it would
be simpler for existing software to ignore unfamiliar schema lines in
the schemata file than to overlook the introduction of a comma to the
CBM in the existing "L3" schema.

Thanks!
-Peter

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  parent reply	other threads:[~2023-08-22  9:01 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-15 15:27 [RFC 00/12] ARM: MPAM: add support for priority partitioning control Amit Singh Tomar
2023-08-15 15:27 ` [RFC 01/12] arm_mpam: Handle resource instances mapped to different controls Amit Singh Tomar
2023-09-01 12:39   ` Jonathan Cameron
2023-08-15 15:27 ` [RFC 02/12] arm_mpam: resctrl: Detect priority partitioning capability Amit Singh Tomar
2023-09-01 12:30   ` Jonathan Cameron
2023-08-15 15:27 ` [RFC 03/12] arm_mpam: resctrl: Define new schemata format for priority partition Amit Singh Tomar
2023-08-15 15:27 ` [RFC 04/12] fs/resctrl: Obtain CPBM upon priority partition presence Amit Singh Tomar
2023-08-15 15:27 ` [RFC 05/12] fs/resctrl: Set-up downstream priority partition resources Amit Singh Tomar
2023-08-17 17:39   ` Fenghua Yu
2023-08-15 15:27 ` [RFC 06/12] fs/resctrl: Extend schemata read for priority partition control Amit Singh Tomar
2023-08-17 17:42   ` Fenghua Yu
2023-08-15 15:27 ` [RFC 07/12] arm_mpam: resctrl: Retrieve priority values from arch code Amit Singh Tomar
2023-08-15 15:27 ` [RFC 08/12] fs/resctrl: Schemata write only for intended resource Amit Singh Tomar
2023-08-15 15:27 ` [RFC 09/12] fs/resctrl: Extend schemata write for priority partition control Amit Singh Tomar
2023-08-17 17:27   ` Fenghua Yu
2023-08-17 17:53   ` Fenghua Yu
2023-08-15 15:27 ` [RFC 10/12] arm_mpam: resctrl: Facilitate writing downstream priority value Amit Singh Tomar
2023-08-15 15:27 ` [RFC 11/12] arm_mpam: Fix Downstream priority mask Amit Singh Tomar
2023-09-01 13:32   ` Jonathan Cameron
2023-08-15 15:27 ` [RFC 12/12] arm_mpam: Program Downstream priority value Amit Singh Tomar
2023-09-01 13:17   ` Jonathan Cameron
2023-08-17 19:11 ` [RFC 00/12] ARM: MPAM: add support for priority partitioning control Reinette Chatre
2023-08-17 20:29   ` Reinette Chatre
2023-08-22 12:44   ` [EXT] " Amit Singh Tomar
2023-08-23 19:06     ` Reinette Chatre
2023-08-23 21:33       ` Amit Singh Tomar
2023-08-23 22:20         ` Reinette Chatre
2023-08-23 22:36           ` Luck, Tony
2023-08-24  8:52           ` Amit Singh Tomar
2023-08-24 15:30             ` Luck, Tony
2023-08-24 18:00             ` Reinette Chatre
2024-01-11 20:56             ` Peter Newman
2024-01-11 21:40               ` Tony Luck
2024-01-11 22:01                 ` Reinette Chatre
2024-01-11 23:14                   ` Luck, Tony
2024-01-11 23:31                     ` Reinette Chatre
2023-08-22  9:01 ` Peter Newman [this message]
2023-09-01 14:42 ` Jonathan Cameron
2023-09-01 15:04 ` Jonathan Cameron

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