linux-kernel - Re: [PATCH v14 30/32] fs/resctrl: Hide the BMEC related files when mbm

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Message-ID: <ff314427-1c03-4e26-be19-c5f5090f3d8a@intel.com>
Date: Wed, 2 Jul 2025 10:21:57 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<Dave.Martin@....com>, <james.morse@....com>, <tglx@...utronix.de>,
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Subject: Re: [PATCH v14 30/32] fs/resctrl: Hide the BMEC related files when
 mbm_event mode is enabled

Hi Babu,

On 7/2/25 9:42 AM, Moger, Babu wrote:
> On 6/25/25 18:39, Reinette Chatre wrote:
>> Hi Babu,
>>
>> On 6/13/25 2:05 PM, Babu Moger wrote:
>>> BMEC (Bandwidth Monitoring Event Configuration) and mbm_event mode do not
>>> work simultaneously.
>>
>> Could you please elaborate why they do not work simultaneously?
> 
> Changed the changelog.
> 
> When mbm_event counter assignment mode is enabled, events are configured
> through the "event_filter" files under
> /sys/fs/resctrl/info/L3_MON/event_configs/.
> 
> The default monitoring mode and with BMEC (Bandwidth Monitoring Event
> Configuration) support, events are configured using the files
> mbm_total_bytes_config or mbm_local_bytes_config in
> /sys/fs/resctrl/info/L3_MON/.

A reasonable question here may be why not just keep using the existing
(BMEC supporting) event configuration files for event configuration? Why
are new event configuration files needed?

> 
> To avoid the confusion, hide BMEC-related files when mbm_event counter
> assignment mode is enabled and update the mon_features display accordingly.
> 

Reinette