linux-kernel - Re: [PATCH v7 22/24] x86/resctrl: Add CPU offline callback for resctrl work

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Date:   Thu, 14 Dec 2023 11:39:06 +0000
From:   James Morse <james.morse@....com>
To:     babu.moger@....com, x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     Fenghua Yu <fenghua.yu@...el.com>,
        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>,
        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
Subject: Re: [PATCH v7 22/24] x86/resctrl: Add CPU offline callback for
 resctrl work

Hi Babu,

On 09/11/2023 20:52, Moger, Babu wrote:
> On 10/25/23 13:03, James Morse wrote:
>> The resctrl architecture specific code may need to free a domain when
>> a CPU goes offline, it also needs to reset the CPUs PQR_ASSOC register.
>> Amongst other things, the resctrl filesystem code needs to clear this
>> CPU from the cpu_mask of any control and monitor groups.
>>
>> Currently this is all done in core.c and called from
>> resctrl_offline_cpu(), making the split between architecture and
>> filesystem code unclear.
>>
>> Move the filesystem work to remove the CPU from the control and monitor
>> groups into a filesystem helper called resctrl_offline_cpu(), and rename
>> the one in core.c resctrl_arch_offline_cpu().

> Reviewed-by: Babu Moger <babu.moger@....com>

Thanks!


James