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

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Message-ID: <20260113150618.00003829@huawei.com>
Date: Tue, 13 Jan 2026 15:06:18 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.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>,
	<kobak@...dia.com>, <lcherian@...vell.com>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>, <punit.agrawal@....qualcomm.com>,
	<quic_jiles@...cinc.com>, <reinette.chatre@...el.com>,
	<rohit.mathew@....com>, <scott@...amperecomputing.com>,
	<sdonthineni@...dia.com>, <tan.shaopeng@...itsu.com>,
	<xhao@...ux.alibaba.com>, <catalin.marinas@....com>, <will@...nel.org>,
	<corbet@....net>, <maz@...nel.org>, <oupton@...nel.org>,
	<joey.gouly@....com>, <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

On Mon, 12 Jan 2026 16:58:54 +0000
Ben Horgan <ben.horgan@....com> 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.
> 
> MB's percentage control should be backed either with the fixed point
> fraction MBW_MAX or bandwidth portion bitmaps. The bandwidth portion
> bitmaps is not used as its tricky to pick which bits to use to avoid
> contention, and may be possible to expose this as something other than a
> percentage in the future.
> 
> CC: Zeng Heng <zengheng4@...wei.com>
> Co-developed-by: Dave Martin <Dave.Martin@....com>
> Signed-off-by: Dave Martin <Dave.Martin@....com>
> Signed-off-by: James Morse <james.morse@....com>>
> Signed-off-by: Ben Horgan <ben.horgan@....com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>