linux-kernel - Re: [PATCH v17 29/33] fs/resctrl: Introduce the interface to modify assignments in a group

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Message-ID: <a6477afd-16dd-4cac-8215-e0cf52246a94@intel.com>
Date: Tue, 2 Sep 2025 20:00:57 -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 29/33] fs/resctrl: Introduce the interface to modify
 assignments in a group

Hi Babu,

On 8/14/25 7:25 PM, Babu Moger wrote:
> Enable the mbm_l3_assignments resctrl file to be used to modify counter
> assignments of CTRL_MON and MON groups when the "mbm_event" counter
> assignment mode is enabled.
> 
> Process the assignment modifications in the following format:
> <Event>:<Domain id>=<Assignment state>;<Domain id>=<Assignment state>
> 
> Event: A valid MBM event in the
>        /sys/fs/resctrl/info/L3_MON/event_configs directory.
> 
> Domain ID: A valid domain ID. When writing, '*' applies the changes
> 	   to all domains.
> 
> Assignment states:
> 
>     _ : Unassign a counter.
> 
>     e : Assign a counter exclusively.
> 
> Examples:
> 
> $ cd /sys/fs/resctrl
> $ cat /sys/fs/resctrl/mbm_L3_assignments
>   mbm_total_bytes:0=e;1=e
>   mbm_local_bytes:0=e;1=e
> 
> To unassign the counter associated with the mbm_total_bytes event on
> domain 0:
> 
> $ echo "mbm_total_bytes:0=_" > mbm_L3_assignments
> $ cat /sys/fs/resctrl/mbm_L3_assignments
>   mbm_total_bytes:0=_;1=e
>   mbm_local_bytes:0=e;1=e
> 
> To unassign the counter associated with the mbm_total_bytes event on
> all the domains:
> 
> $ echo "mbm_total_bytes:*=_" > mbm_L3_assignments
> $ cat /sys/fs/resctrl/mbm_L3_assignments
>   mbm_total_bytes:0=_;1=_
>   mbm_local_bytes:0=e;1=e
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---

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

Reinette