linux-kernel - Re: [PATCH v12 27/31] fs/resctrl: Move RMID initialization to first mount

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Message-ID: <f772f72b-86cb-49d2-b55f-655efa9b9d23@intel.com>
Date: Thu, 23 Oct 2025 10:49:54 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghuay@...dia.com>, "Maciej
 Wieczor-Retman" <maciej.wieczor-retman@...el.com>, Peter Newman
	<peternewman@...gle.com>, James Morse <james.morse@....com>, Babu Moger
	<babu.moger@....com>, Drew Fustini <dfustini@...libre.com>, Dave Martin
	<Dave.Martin@....com>, Chen Yu <yu.c.chen@...el.com>
CC: <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<patches@...ts.linux.dev>
Subject: Re: [PATCH v12 27/31] fs/resctrl: Move RMID initialization to first
 mount

Hi Tony,

On 10/13/25 3:33 PM, Tony Luck wrote:
> L3 monitor features are enumerated during resctrl initialization
> and rmid_ptrs[] that tracks all RMIDs and depends on the
> number of supported RMIDs is allocated during this time.
> 
> Telemetry monitor features are enumerated during first resctrl mount and
> may support a different number of RMIDs compared to L3 monitor features.
> 
> Delay allocation and initialization of rmid_ptrs[] until first mount.
> Since the number of RMIDs cannot change on later mounts, keep the same
> set of rmid_ptrs[] until resctrl_exit(). This is required because the
> limbo handler keeps running after resctrl is unmounted and may likely
> need to access rmid_ptrs[] as it keeps tracking busy RMIDs after unmount.

"may likely need" -> "needs"

> 
> Rename routines to match what they now do:
> dom_data_init() -> setup_rmid_lru_list()
> dom_data_exit() -> free_rmid_lru_list()
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---

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

Reinette