linux-kernel - Re: [PATCH v3 6/7] x86/resctrl: Introduce -o debug mount option

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Message-ID: <ff10ac75-2f05-1237-f1a4-d3e68dde99b9@amd.com>
Date:   Wed, 22 Mar 2023 09:01:42 -0500
From:   "Moger, Babu" <babu.moger@....com>
To:     Reinette Chatre <reinette.chatre@...el.com>, corbet@....net,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de
Cc:     fenghua.yu@...el.com, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, paulmck@...nel.org, akpm@...ux-foundation.org,
        quic_neeraju@...cinc.com, rdunlap@...radead.org,
        damien.lemoal@...nsource.wdc.com, songmuchun@...edance.com,
        peterz@...radead.org, jpoimboe@...nel.org, pbonzini@...hat.com,
        chang.seok.bae@...el.com, pawan.kumar.gupta@...ux.intel.com,
        jmattson@...gle.com, daniel.sneddon@...ux.intel.com,
        sandipan.das@....com, tony.luck@...el.com, james.morse@....com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        bagasdotme@...il.com, eranian@...gle.com,
        christophe.leroy@...roup.eu, jarkko@...nel.org,
        adrian.hunter@...el.com, quic_jiles@...cinc.com,
        peternewman@...gle.com
Subject: Re: [PATCH v3 6/7] x86/resctrl: Introduce -o debug mount option



On 3/15/23 13:43, Reinette Chatre wrote:
> Hi Babu,
> 
> On 3/2/2023 12:25 PM, Babu Moger wrote:
>> Add -o debug option to mount resctrl filesystem in debug mode. Debug
>> option adds the files for debug purposes.
>>
>> Signed-off-by: Babu Moger <babu.moger@....com>
>> ---
>>  Documentation/x86/resctrl.rst          |    2 ++
>>  arch/x86/kernel/cpu/resctrl/internal.h |    1 +
>>  arch/x86/kernel/cpu/resctrl/rdtgroup.c |   13 +++++++++++++
>>  3 files changed, 16 insertions(+)
>>
>> diff --git a/Documentation/x86/resctrl.rst b/Documentation/x86/resctrl.rst
>> index 67eae74fe40c..1ada4e0650dc 100644
>> --- a/Documentation/x86/resctrl.rst
>> +++ b/Documentation/x86/resctrl.rst
>> @@ -46,6 +46,8 @@ mount options are:
>>  "mba_MBps":
>>  	Enable the MBA Software Controller(mba_sc) to specify MBA
>>  	bandwidth in MBps
>> +"debug":
>> +	Lists the debug files in resctrl interface
>>  
> 
> This seems to imply that a listing of available debug flags
> will be displayed. How about something like "Make debug files
> accessible. Available debug files are annotated with "Available
> only with debug option"." (please feel free to improve).

Sure.

> 
>>  L2 and L3 CDP are controlled separately.
>>  
>> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
>> index 6767c85b9699..35a9ee343fe0 100644
>> --- a/arch/x86/kernel/cpu/resctrl/internal.h
>> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
>> @@ -59,6 +59,7 @@ struct rdt_fs_context {
>>  	bool				enable_cdpl2;
>>  	bool				enable_cdpl3;
>>  	bool				enable_mba_mbps;
>> +	bool				debug;
> 
> Why not follow the prefix of existing flags?

Ok. Sure. Will change it.

-- 
Thanks
Babu Moger