linux-kernel - Re: [PATCH RFC 00/19] RISC-V: QoS: add CBQRI resctrl interface

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Message-ID: <1c9b21e3-f64b-4a0c-9e1b-cc90d981159c@intel.com>
Date: Thu, 22 Jan 2026 14:31:06 -0800
From: Reinette Chatre <reinette.chatre@...el.com>
To: Drew Fustini <fustini@...nel.org>, Paul Walmsley <pjw@...nel.org>, "Palmer
 Dabbelt" <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, "Alexandre
 Ghiti" <alex@...ti.fr>, Radim Krčmář
	<rkrcmar@...tanamicro.com>, Samuel Holland <samuel.holland@...ive.com>,
	Adrien Ricciardi <aricciardi@...libre.com>, Nicolas Pitre
	<npitre@...libre.com>, Kornel Dulęba <mindal@...ihalf.com>,
	Atish Patra <atish.patra@...ux.dev>, Atish Kumar Patra <atishp@...osinc.com>,
	Vasudevan Srinivasan <vasu@...osinc.com>, Ved Shanbhogue <ved@...osinc.com>,
	yunhui cui <cuiyunhui@...edance.com>, Chen Pei <cp0613@...ux.alibaba.com>,
	Liu Zhiwei <zhiwei_liu@...ux.alibaba.com>, Weiwei Li <liwei1518@...il.com>,
	<guo.wenjia23@....com.cn>, <liu.qingtao2@....com.cn>, Conor Dooley
	<conor+dt@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring
	<robh+dt@...nel.org>, Tony Luck <tony.luck@...el.com>, Babu Moger
	<babu.moger@....com>, Peter Newman <peternewman@...gle.com>, Fenghua Yu
	<fenghua.yu@...el.com>, James Morse <james.morse@....com>, Ben Horgan
	<ben.horgan@....com>, Dave Martin <Dave.Martin@....com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-riscv@...ts.infradead.org>, <x86@...nel.org>
CC: Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH RFC 00/19] RISC-V: QoS: add CBQRI resctrl interface

Hi Drew,

On 1/19/26 8:14 PM, Drew Fustini wrote:
>  - No MBM (bandwidth monitoring)
>    - MBA schema works ok for the CBQRI-enabled memory controllers, but
>      resctrl does not currently have solution for representing MBM for
>      bandwidth resources that are not associated with a L3 cache.
>    - For the old CBQRI proof-of-concept RFC, two separate domains were
>      created for each memory controller: one for MB (allocation) and one
>      for MBM (monitoring).
>    - The monitoring domains had to pretend that these memory controllers
>      were L3 caches which is not the case. I have removed this as it was
>      too complicated and not the right solution.
>    - Fenghua Yu talked about a similar problem last month at LPC in the
>      resctrl BoF during the "MBA/MBM on CPU-less Memory Node" topic:
>      https://lpc.events/event/19/contributions/2093/
>    - I hope to work with resctrl developers on finding a solution.

Specific to this open, could you please consider [1] that proposes a way for
resctrl to handle allocation and monitoring of resources at different scope?

Reinette

[1] https://lore.kernel.org/lkml/fb1e2686-237b-4536-acd6-15159abafcba@intel.com/