linux-kernel - Re: [PATCH v17 24/33] fs/resctrl: Add event configuration directory under info/L3

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Message-ID: <915ab800-510e-40a3-8228-373ae41bc3ec@intel.com>
Date: Tue, 2 Sep 2025 19:35:06 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Babu Moger <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>
CC: <Dave.Martin@....com>, <james.morse@....com>, <x86@...nel.org>,
	<hpa@...or.com>, <akpm@...ux-foundation.org>, <rostedt@...dmis.org>,
	<paulmck@...nel.org>, <pawan.kumar.gupta@...ux.intel.com>, <kees@...nel.org>,
	<arnd@...db.de>, <fvdl@...gle.com>, <seanjc@...gle.com>,
	<thomas.lendacky@....com>, <yosry.ahmed@...ux.dev>, <xin@...or.com>,
	<sohil.mehta@...el.com>, <kai.huang@...el.com>, <xiaoyao.li@...el.com>,
	<peterz@...radead.org>, <mario.limonciello@....com>, <xin3.li@...el.com>,
	<perry.yuan@....com>, <chang.seok.bae@...el.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>, <eranian@...gle.com>, <gautham.shenoy@....com>
Subject: Re: [PATCH v17 24/33] fs/resctrl: Add event configuration directory
 under info/L3_MON/

Hi Babu,

On 8/14/25 7:25 PM, Babu Moger wrote:
> The "mbm_event" counter assignment mode allows the user to assign a
> hardware counter to an RMID, event pair and monitor the bandwidth as long
> as it is assigned. The user can specify the memory transaction(s) for the
> counter to track.
> 
> When this mode is supported, the /sys/fs/resctrl/info/L3_MON/event_configs
> directory contains a sub-directory for each MBM event that can be assigned
> to a counter.  The MBM event sub-directory contains a file named
> "event_filter" that is used to view and modify which memory transactions
> the MBM event is configured with.
> 
> Create /sys/fs/resctrl/info/L3_MON/event_configs directory on resctrl mount
> and pre-populate it with directories for the two existing MBM events:
> mbm_total_bytes and mbm_local_bytes. Create the "event_filter" file within
> each MBM event directory with the needed *show() that displays the memory
> transactions with which the MBM event is configured.
> 
> Example:
> $ mount -t resctrl resctrl /sys/fs/resctrl
> $ cd /sys/fs/resctrl/
> $ cat info/L3_MON/event_configs/mbm_total_bytes/event_filter
>   local_reads,remote_reads,local_non_temporal_writes,
>   remote_non_temporal_writes,local_reads_slow_memory,
>   remote_reads_slow_memory,dirty_victim_writes_all
> 
> $ cat info/L3_MON/event_configs/mbm_local_bytes/event_filter
>   local_reads,local_non_temporal_writes,local_reads_slow_memory
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---

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

Reinette