linux-kernel - Re: [PATCH v11 07/30] x86/resctrl: Check all domains are offline in resctrl

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Message-ID: <a078be51-7121-4571-a5f1-41594ebfa909@nvidia.com>
Date: Wed, 14 May 2025 16:37:16 -0700
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>,
 Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH v11 07/30] x86/resctrl: Check all domains are offline in
 resctrl_exit()


On 5/13/25 10:15, James Morse wrote:
> resctrl_exit() removes things like the resctrl mount point directory
> and unregisters the filesystem prior to freeing data structures that
> were allocated during resctrl_init().
>
> This assumes that there are no online domains when resctrl_exit() is
> called. If any domain were online, the limbo or overflow handler could
> be scheduled to run.
>
> Add a check for any online control or monitor domains, and document that
> the architecture code is required to offline all monitor and control
> domains before calling resctrl_exit().
>
> Suggested-by: Reinette Chatre <reinette.chatre@...el.com>
> Signed-off-by: James Morse <james.morse@....com>
> Tested-by: Babu Moger <babu.moger@....com>
> Tested-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>

Reviewed-by: Fenghua Yu <fenghuay@...dia.com>

Thanks.

-Fenghua