Re: [PATCH v4 13/28] cxl/mem: Expose DCD partition capabilities in sysfs

Bagas Sanjaya
2024-10-11T02:15:30Z

[-- Attachment #1: Type: text/plain, Size: 1090 bytes --]

On Mon, Oct 07, 2024 at 06:16:19PM -0500, ira.weiny@intel.com wrote:
> +What: /sys/bus/cxl/devices/memX/dcY/qos_class
> +Date: December, 2024
> +KernelVersion: v6.13
> +Contact: linux-cxl@vger.kernel.org
> +Description:
> + (RO) Dynamic Capacity (DC) region information. Devices only
> + export dcY if DCD partition Y is supported. For CXL host
> + platforms that support "QoS Telemmetry" this attribute conveys
> + a comma delimited list of platform specific cookies that
> + identifies a QoS performance class for the persistent partition
> + of the CXL mem device. These class-ids can be compared against
> + a similar "qos_class" published for a root decoder. While it is
> + not required that the endpoints map their local memory-class to
> + a matching platform class, mismatches are not recommended and
> + there are platform specific performance related side-effects
"... mismatches are not recommended as there are ..."
> + that may result. First class-id is displayed.
>

Thanks.

--
An old man doll... just what I always wanted! - Clara

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]