linux-kernel - Re: [PATCH v13 26/32] fs/resctrl: Move allocation/free of closid_num_dirty

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Message-ID: <25334395-d22e-4ff9-b393-7f776eb15d6a@intel.com>
Date: Thu, 13 Nov 2025 14:51:58 -0800
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 v13 26/32] fs/resctrl: Move allocation/free of
 closid_num_dirty_rmid[]

Hi Tony,

On 10/29/25 9:21 AM, Tony Luck wrote:
> closid_num_dirty_rmid[] and rmid_ptrs[] are allocated together during resctrl
> initialization and freed together during resctrl exit.
> 
> Telemetry events are enumerated on resctrl mount so only at resctrl mount will
> the number of RMID supported by all monitoring resources and needed as size for
> rmid_ptrs[] be known.
> 
> Separate closid_num_dirty_rmid[] and rmid_ptrs[] allocation and free in
> preparation for rmid_ptrs[] to be allocated on resctrl mount.
> 
> Keep the rdtgroup_mutex protection around the allocation and free of
> closid_num_dirty_rmid[] as ARM needs this to guarantee memory ordering.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---

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

Reinette