linux-kernel - Re: [PATCH v5 14/24] x86/resctrl: Allow resctrl_arch_rmid

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Message-ID: <5d4eba94-659f-ba18-6214-027e565e2d45@intel.com>
Date:   Fri, 8 Sep 2023 13:15:36 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     James Morse <james.morse@....com>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Fenghua Yu <fenghua.yu@...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>, <peternewman@...gle.com>,
        <dfustini@...libre.com>
Subject: Re: [PATCH v5 14/24] x86/resctrl: Allow resctrl_arch_rmid_read() to
 sleep

Hi James,

On 9/8/2023 8:58 AM, James Morse wrote:
> 
> That comment now reads:
>  * resctrl_arch_rmid_read_context_check()  - warn about invalid contexts
>  *
>  * When built with CONFIG_DEBUG_ATOMIC_SLEEP generate a warning when
>  * resctrl_arch_rmid_read() is called with preemption disabled.
>  *
>  * The contract with resctrl_arch_rmid_read() is that if interrupts
>  * are unmasked, it can sleep. This allows NOHZ_FULL systems to use an
>  * IPI, (and fail if the call needed to sleep), while most of the time
>  * the work is scheduled, allowing the call to sleep.
> 

Thank you very much.

Reinette