linux-kernel - Re: [PATCH v17 27/33] fs/resctrl: Auto assign counters on mkdir and clean up on group removal

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Message-ID: <b26f303b-3acd-44c1-a53e-15a9db6dcf1c@intel.com>
Date: Tue, 2 Sep 2025 19:45:48 -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 27/33] fs/resctrl: Auto assign counters on mkdir and
 clean up on group removal

Hi Babu,

On 8/14/25 7:25 PM, Babu Moger wrote:
> Resctrl provides a user-configurable option mbm_assign_on_mkdir that
> determines if a counter will automatically be assigned to an RMID, event
> pair when its associated monitor group is created via mkdir.
> 
> Enable mbm_assign_on_mkdir by default to automatically assign counters to
> the two default events (MBM total and MBM local) of a new monitoring group
> created via mkdir. This maintains backward compatibility with original
> resctrl support for these two events.
> 
> Unassign and free counters belonging to a monitoring group when the group
> is deleted.
> 
> Monitor group creation does not fail if a counter cannot be assigned to one
> or both events. There may be limited counters and users have the
> flexibility to modify counter assignments at a later time. Log the error
> message "Failed to allocate counter for <event> in domain <id>" in
> /sys/fs/resctrl/info/last_cmd_status when a new monitoring group is created
> but counter assignment failed.
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---

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

Reinette