linux-kernel - Re: [PATCH v11 11/13] x86/resctrl: Add interface to write mbm_total_bytes

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Message-ID: <6390de72-36c8-39ea-7ece-eed0b464359a@intel.com>
Date:   Wed, 11 Jan 2023 14:04:54 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Babu Moger <babu.moger@....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>,
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        <james.morse@....com>, <linux-doc@...r.kernel.org>,
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        <jarkko@...nel.org>, <adrian.hunter@...el.com>,
        <quic_jiles@...cinc.com>, <peternewman@...gle.com>
Subject: Re: [PATCH v11 11/13] x86/resctrl: Add interface to write
 mbm_total_bytes_config

Hi Babu,

On 1/9/2023 8:44 AM, Babu Moger wrote:
> The event configuration for mbm_total_bytes can be changed by the user by
> writing to the file /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config.
> 
> The event configuration settings are domain specific and 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
> ====  ===========================================================
> 
> For example:
> To change the mbm_total_bytes to count only reads on domain 0, the bits
> 0, 1, 4 and 5 needs to be set, which is 110011b (in hex 0x33). Run the
> command.
>         $echo  0=0x33 > /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config
> 
> To change the mbm_total_bytes to count all the slow memory reads on
> domain 1, the bits 4 and 5 needs to be set which is 110000b (in hex 0x30).
> Run the command.
>         $echo  1=0x30 > /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config
> 
> Signed-off-by: Babu Moger <babu.moger@....com>

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Thank you

Reinette