linux-kernel - Re: [PATCH v14 32/32] x86,fs/resctrl: Update documentation for telemetry events

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Message-ID: <40858873-6cae-49e3-b3cb-065f9722b178@intel.com>
Date: Tue, 2 Dec 2025 08:34:10 -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 v14 32/32] x86,fs/resctrl: Update documentation for
 telemetry events

Hi Tony,

On 11/24/25 10:54 AM, Tony Luck wrote:
> @@ -484,6 +483,25 @@ with the following files:
>  		bytes) at which a previously used LLC_occupancy
>  		counter can be considered for re-use.
>  
> +If telemetry monitoring is available there will be a "PERF_PKG_MON" directory
> +with the following files:
> +
> +"num_rmids":
> +		The number of RMIDs for telemetry monitoring events. By default,
> +		resctrl will not enable telemetry events of a particular type
> +		("perf" or "energy") if the number of RMIDs that can be tracked
> +		concurrently for that type is lower than the total number of
> +		RMIDs supported by that type. The user can force-enable each
> +		type of telemetry events with the "rdt=" boot command line
> +		option, but this may reduce the number of monitoring groups that
> +		can be created.

v14 changed implementation to no longer disable all events at level of the type.

Reinette