linux-kernel - Re: [PATCH v7 28/49] x86/resctrl: Handle throttle

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Message-ID: <e08ded42-0a94-4cc7-8042-7b893aef274f@nvidia.com>
Date: Thu, 6 Mar 2025 13:37:52 -0800
From: Fenghua Yu <fenghuay@...dia.com>
To: James Morse <james.morse@....com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Cc: Reinette Chatre <reinette.chatre@...el.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, H Peter Anvin <hpa@...or.com>,
 Babu Moger <Babu.Moger@....com>, shameerali.kolothum.thodi@...wei.com,
 D Scott Phillips OS <scott@...amperecomputing.com>,
 carl@...amperecomputing.com, lcherian@...vell.com,
 bobo.shaobowang@...wei.com, tan.shaopeng@...itsu.com,
 baolin.wang@...ux.alibaba.com, Jamie Iles <quic_jiles@...cinc.com>,
 Xin Hao <xhao@...ux.alibaba.com>, peternewman@...gle.com,
 dfustini@...libre.com, amitsinght@...vell.com,
 David Hildenbrand <david@...hat.com>, Rex Nie <rex.nie@...uarmicro.com>,
 Dave Martin <dave.martin@....com>, Koba Ko <kobak@...dia.com>,
 Shanker Donthineni <sdonthineni@...dia.com>
Subject: Re: [PATCH v7 28/49] x86/resctrl: Handle throttle_mode for SMBA
 resources


On 2/28/25 11:58, James Morse wrote:
> Now that the visibility of throttle_mode is being managed by resctrl, it
> should consider resources other than MBA that may have a throttle_mode.
> SMBA is one such resource.
>
> Extend thread_throttle_mode_init() to check SMBA for a throttle_mode.
>
> Adding support for multiple resources means it is possible for a platform
> with both MBA and SMBA, but an undefined throttle_mode on one of them
> to make the file visible.
>
> Add the 'undefined' case to rdt_thread_throttle_mode_show().
>
> Signed-off-by: James Morse <james.morse@....com>
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Reviewed-by: Fenghua Yu <fenghuay@...dia.com>


Thanks.


-Fenghua