linux-kernel - Re: [PATCH v10 09/13] x86/resctrl: Add interface to read mbm_total_bytes

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Date:   Thu, 5 Jan 2023 09:49:39 -0600
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 v10 09/13] x86/resctrl: Add interface to read
 mbm_total_bytes_config

Hi Reinette,

On 1/4/23 18:29, Reinette Chatre wrote:
> Hi Babu,
>
> On 12/22/2022 3:31 PM, Babu Moger wrote:
>> The event configuration can be viewed by the user by reading the
>> configuration file /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config.
>> The event configuration settings are domain specific and will affect all
>> the CPUs in the domain.
>>
>> Following are the types of events supported:
>> ====  ===========================================================
>> Bits   Description
>> ====  ===========================================================
>> 6      Dirty Victims from the QOS domain to all types of memory
>> 5      Reads to slow memory in the non-local NUMA domain
>> 4      Reads to slow memory in the local NUMA domain
>> 3      Non-temporal writes to non-local NUMA domain
>> 2      Non-temporal writes to local NUMA domain
>> 1      Reads to memory in the non-local NUMA domain
>> 0      Reads to memory in the local NUMA domain
>> ====  ===========================================================
>>
>> By default, the mbm_total_bytes_config is set to 0x7f to count all the
>> event types.
>>
>> For example:
>>     $cat /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config
>>     0=0x7f;1=0x7f;2=0x7f;3=0x7f
>>
>>     In this case, the event mbm_total_bytes is configured with 0x7f on
>>     domains 0 to 3.
>>
>> Signed-off-by: Babu Moger <babu.moger@....com>
> ...
>
>> --- a/arch/x86/kernel/cpu/resctrl/internal.h
>> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
>> @@ -30,6 +30,29 @@
>>   */
>>  #define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
>>  
>> +/* Reads to Local DRAM Memory */
>> +#define READS_TO_LOCAL_MEM		BIT(0)
>> +
>> +/* Reads to Remote DRAM Memory */
>> +#define READS_TO_REMOTE_MEM		BIT(1)
>> +
>> +/* Non-Temporal Writes to Local Memory */
>> +#define NON_TEMP_WRITE_TO_LOCAL_MEM	BIT(2)
>> +
>> +/* Non-Temporal Writes to Remote Memory */
>> +#define NON_TEMP_WRITE_TO_REMOTE_MEM	BIT(3)
>> +
>> +/* Reads to Local Memory the system identifies as "Slow Memory" */
>> +#define READS_TO_LOCAL_S_MEM		BIT(4)
>> +
>> +/* Reads to Remote Memory the system identifies as "Slow Memory" */
>> +#define READS_TO_REMOTE_S_MEM		BIT(5)
>> +
>> +/* Dirty Victims to All Types of Memory */
>> +#define  DIRTY_VICTIMS_TO_ALL_MEM	BIT(6)
> Some stray white space above.
Sure.
>
>> +
>> +/* Max event bits supported */
>> +#define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)
>>  
>>  struct rdt_fs_context {
>>  	struct kernfs_fs_context	kfc;
> Please remove stray white space. With that:
>
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Thanks

Babu

>
> Reinette
>
>
-- 
Thanks
Babu Moger