linux-kernel - Re: [PATCH v18 25/33] fs/resctrl: Provide interface to update the event configurations

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Message-ID: <effa04df-5452-4d9f-b026-73f9e043e324@intel.com>
Date: Fri, 5 Sep 2025 21:49:38 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Babu Moger <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<Dave.Martin@....com>, <james.morse@....com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <kas@...nel.org>,
	<rick.p.edgecombe@...el.com>, <akpm@...ux-foundation.org>,
	<paulmck@...nel.org>, <frederic@...nel.org>, <pmladek@...e.com>,
	<rostedt@...dmis.org>, <kees@...nel.org>, <arnd@...db.de>, <fvdl@...gle.com>,
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	<pawan.kumar.gupta@...ux.intel.com>, <perry.yuan@....com>,
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	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-coco@...ts.linux.dev>, <kvm@...r.kernel.org>,
	<peternewman@...gle.com>, <eranian@...gle.com>, <gautham.shenoy@....com>
Subject: Re: [PATCH v18 25/33] fs/resctrl: Provide interface to update the
 event configurations

Hi Babu,

On 9/5/25 2:34 PM, Babu Moger wrote:
> When "mbm_event" counter assignment mode is enabled, users can modify
> the event configuration by writing to the 'event_filter' resctrl file.
> The event configurations for mbm_event mode are located in
> /sys/fs/resctrl/info/L3_MON/event_configs/.
> 
> Update the assignments of all CTRL_MON and MON resource groups when the
> event configuration is modified.
> 
> Example:
> $ mount -t resctrl resctrl /sys/fs/resctrl
> 
> $ cd /sys/fs/resctrl/
> 
> $ cat info/L3_MON/event_configs/mbm_local_bytes/event_filter
>   local_reads,local_non_temporal_writes,local_reads_slow_memory
> 
> $ echo "local_reads,local_non_temporal_writes" >
>   info/L3_MON/event_configs/mbm_total_bytes/event_filter
> 
> $ cat info/L3_MON/event_configs/mbm_total_bytes/event_filter
>   local_reads,local_non_temporal_writes
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---

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

Reinette