linux-kernel - Re: [PATCH v4 00/24] x86/resctrl: monitored closid+rmid together, separate arch/fs locking

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Message-ID: <479ea81d-024a-5a7e-f045-4de52e97a599@intel.com>
Date:   Thu, 15 Jun 2023 16:28:40 -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 v4 00/24] x86/resctrl: monitored closid+rmid together,
 separate arch/fs locking

Hi James,

On 5/25/2023 11:01 AM, James Morse wrote:
> 
> The second part of this series adds a domain_list_lock to protect writes to the
> domain list, and protects the domain list with RCU - or read_cpus_lock().

read_cpus_lock() -> cpus_read_lock()

> 
> Use of RCU is to allow lockless readers of the domain list, today resctrl only has
> one, rdt_bit_usage_show(). But to get MPAMs monitors working, its very likely

This may need an update to reflect changes since initial version (similar to the
relevant patch).

Reinette