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

Reinette Chatre
2025-12-02T16:34:26Z

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