linux-kernel - Re: [PATCH v3 27/47] arm_mpam: resctrl: Add support for 'MB' resource

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Message-ID: <a48260d0-108c-470f-be72-1fd5235cf136@intel.com>
Date: Tue, 13 Jan 2026 14:18:48 -0800
From: Reinette Chatre <reinette.chatre@...el.com>
To: Ben Horgan <ben.horgan@....com>
CC: <amitsinght@...vell.com>, <baisheng.gao@...soc.com>,
	<baolin.wang@...ux.alibaba.com>, <carl@...amperecomputing.com>,
	<dave.martin@....com>, <david@...nel.org>, <dfustini@...libre.com>,
	<fenghuay@...dia.com>, <gshan@...hat.com>, <james.morse@....com>,
	<jonathan.cameron@...wei.com>, <kobak@...dia.com>, <lcherian@...vell.com>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
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	<suzuki.poulose@....com>, <kvmarm@...ts.linux.dev>, Zeng Heng
	<zengheng4@...wei.com>
Subject: Re: [PATCH v3 27/47] arm_mpam: resctrl: Add support for 'MB' resource

Hi Ben,

On 1/12/26 8:58 AM, Ben Horgan wrote:
> From: James Morse <james.morse@....com>
> 
> resctrl supports 'MB', as a percentage throttling of traffic somewhere
> after the L3. This is the control that mba_sc uses, so ideally the class
> chosen should be as close as possible to the counters used for mba_local.

fyi ... [1] enabled total memory bandwidth to also be used as input to
software controller and additionally enabled user space to set per resource group
which memory bandwidth event is used as input to the software controller.

Reinette

[1] https://lore.kernel.org/all/20241206163148.83828-1-tony.luck@intel.com/