linux-kernel - Re: [PATCH v7 03/24] x86/resctrl: Create helper for RMID allocation and mondata dir creation

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Message-ID: <85f8756a-23a0-444e-b37d-a7817b600f46@intel.com>
Date:   Thu, 9 Nov 2023 09:40:33 -0800
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>,
        <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>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH v7 03/24] x86/resctrl: Create helper for RMID allocation
 and mondata dir creation

Hi James,

On 10/25/2023 11:03 AM, James Morse wrote:
> When monitoring is supported, each monitor and control group is allocated
> an RMID. For control groups, rdtgroup_mkdir_ctrl_mon() later goes on to
> allocate the CLOSID.
> 
> MPAM's equivalent of RMID are not an independent number, so can't be
> allocated until the CLOSID is known. An RMID allocation for one CLOSID
> may fail, whereas another may succeed depending on how many monitor
> groups a control group has.
> 
> The RMID allocation needs to move to be after the CLOSID has been
> allocated.
> 
> Move the RMID allocation and mondata dir creation to a helper, this
> makes a subsequent change easier to read.

Boris recently reminded us that text like "subsequent change" loses meaning
once the commit forms part of the kernel. This term is used in a couple of
places in this series. Please review all changelogs to remove this term
to avoid another re-spin.

For reference:
https://lore.kernel.org/lkml/20231009171918.GPZSQ2Frs%2Fqp129wsP@fat_crate.local/

> 
> Tested-by: Peter Newman <peternewman@...gle.com>
> Tested-by: Shaopeng Tan <tan.shaopeng@...itsu.com>
> Reviewed-by: Shaopeng Tan <tan.shaopeng@...itsu.com>
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
> Signed-off-by: James Morse <james.morse@....com>

Please have tags follow "Ordering of commit tags" in
Documentation/process/maintainer-tip.rst (author SOB
appears before the Tested-by/Reviewed-by/Acked-by).

Reinette