linux-kernel - Re: [PATCH v4 12/24] x86/resctrl: Make resctrl_arch_rmid

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Message-ID: <CALPaoCj3h=ELzRwUB2FcPAFAMD7G_nq1-r=PUGOuLq38bUMr0g@mail.gmail.com>
Date:   Thu, 8 Jun 2023 10:53:47 +0200
From:   Peter Newman <peternewman@...gle.com>
To:     James Morse <james.morse@....com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        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>,
        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,
        xingxin.hx@...nanolis.org, baolin.wang@...ux.alibaba.com,
        Jamie Iles <quic_jiles@...cinc.com>,
        Xin Hao <xhao@...ux.alibaba.com>, dfustini@...libre.com
Subject: Re: [PATCH v4 12/24] x86/resctrl: Make resctrl_arch_rmid_read() retry
 when it is interrupted

Hi James,

On Thu, May 25, 2023 at 8:03 PM James Morse <james.morse@....com> wrote:
>
> resctrl_arch_rmid_read() could be called by resctrl in process context,
> and then called by the PMU driver from irq context on the same CPU.

Will there be x86 PMU changes to do this or is this only ARM? I just
want to make sure the x86 resctrl_arch_rmid_read() changes are
actually needed.

Thanks!
-Peter