linux-kernel - Re: [PATCH v6 4/8] x86/resctrl: Add comments on RFTYPE flags hierarchy

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Message-ID: <d6dfa143-36e1-a92e-8a73-7b5dfd3db62d@amd.com>
Date:   Mon, 7 Aug 2023 10:40:23 -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 v6 4/8] x86/resctrl: Add comments on RFTYPE flags
 hierarchy

Hi Reinette,

On 8/4/23 15:39, Reinette Chatre wrote:
> Hi Babu,
> 
> On 7/19/2023 4:21 PM, Babu Moger wrote:
>> + *	------------------------------------------------------------------
>> + *	--> RFTYPE_INFO
>> + *	--> <info> directory
>> + *		--> RFTYPE_TOP_INFO
>> + *		    Files: last_cmd_status
>> + *
>> + *		--> RFTYPE_MON_INFO
>> + *		--> <L3_MON> directory
>> + *		    Files: max_threshold_occupancy, mon_features,
>> + *		           num_rmids, mbm_total_bytes_config,
>> + *		           mbm_locat_bytes_config
> 
> mbm_locat_bytes_config -> mbm_local_bytes_config

Good catch. Thanks

> 
>> + *
>> + *		--> RFTYPE_CTRL_INFO
>> + *			--> RFTYPE_RES_CACHE
>> + *			--> <L2,L3> directory
> 
> Should this be "directories"?

Yes.

> 
>> + *			    Files: bit_usage, cbm_mask, min_cbm_bits,
>> + *			           num_closids, shareable_bits
> 
> Based on the hierarchy presented the files mentioned here may be expected
> to be associated with RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE.
> For accuracy it may be better to move num_closids one level higher so
> that it is only associated with RFTYPE_CTRL_INFO?
> 
>> + *
>> + *			--> RFTYPE_RES_MB
>> + *			--> <MB,SMBA> directory
> 
> directories?

Yes.

> 
>> + *			    Files: bandwidth_gran, delay_linear,
>> + * 			           min_bandwidth, num_closids,
> 
> Please remove space before tab for a clean checkpatch.pl run.

Sure.
> 
>> + *			           thread_throttle_mode
>> + *
>> + *	base (root) directory structure
> 
> Since "base" refers to more than the root directory I think this can
> just be "base directory structure".

Sure.

> 
>> + *	------------------------------------------------------------------
>> + *	--> RFTYPE_BASE (Files common for both MON and CTRL groups)
>> + *	    Files: cpus, cpus_list, tasks
>> + *
>> + *	--> RFTYPE_CTRL_BASE (Files only for CTRL group)
>> + *	    Files: mode, schemata, size
>> + *
>>   */
>>  #define RFTYPE_INFO			BIT(0)
>>  #define RFTYPE_BASE			BIT(1)
>>
>>
> 
> Reinette

-- 
Thanks
Babu Moger