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

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Message-ID: <ZwiKOyvXFXfAiOOU@archie.me>
Date: Fri, 11 Oct 2024 09:15:23 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: ira.weiny@...el.com, Dave Jiang <dave.jiang@...el.com>,
	Fan Ni <fan.ni@...sung.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Navneet Singh <navneet.singh@...el.com>,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: Dan Williams <dan.j.williams@...el.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	linux-btrfs@...r.kernel.org, linux-cxl@...r.kernel.org,
	linux-doc@...r.kernel.org, nvdimm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 13/28] cxl/mem: Expose DCD partition capabilities in
 sysfs

On Mon, Oct 07, 2024 at 06:16:19PM -0500, ira.weiny@...el.com wrote:
> +What:		/sys/bus/cxl/devices/memX/dcY/qos_class
> +Date:		December, 2024
> +KernelVersion:	v6.13
> +Contact:	linux-cxl@...r.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

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