linux-kernel - Re: [PATCH v1 04/20] x86/resctrl: Add domain offline callback for resctrl work

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Message-ID: <987bf8ec-44d4-6aa9-820c-8a2dff60d807@intel.com>
Date:   Wed, 1 Sep 2021 14:21:03 -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>,
        Jamie Iles <jamie@...iainc.com>,
        "D Scott Phillips OS" <scott@...amperecomputing.com>,
        <lcherian@...vell.com>, <bobo.shaobowang@...wei.com>
Subject: Re: [PATCH v1 04/20] x86/resctrl: Add domain offline callback for
 resctrl work

Hi James,

On 7/29/2021 3:35 PM, James Morse wrote:
> Because domains are exposed to user-space via resctrl, the filesystem
> must update its state when cpu hotplug callbacks are triggered.

cpu -> CPU please.

> 
> Some of this work is common to any architecture that would support
> resctrl, but the work is tied up with the architecture code to
> free the memory.
> 
> Move the monitor subdir removal and the cancelling of the mbm/limbo
> works into a new resctrl_offline_domain() call.

Same as previous patch, could you please elaborate how the code change 
you describe fixes the problem you state earlier.

...

> +void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
> +{
> +	lockdep_assert_held(&rdtgroup_mutex); // the arch code took this for us
> +

No trailing comments please.

Reinette