linux-kernel - Re: [PATCH v3 2/3] cxl/region: Support to calculate memory tier abstract distance

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Message-ID: <20240620121338.0000734f@Huawei.com>
Date: Thu, 20 Jun 2024 12:13:38 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Huang Ying <ying.huang@...el.com>
CC: Dan Williams <dan.j.williams@...el.com>, Dave Jiang
	<dave.jiang@...el.com>, <linux-cxl@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Alison Schofield
	<alison.schofield@...el.com>, Andrew Morton <akpm@...ux-foundation.org>,
	Bharata B Rao <bharata@....com>, Alistair Popple <apopple@...dia.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>, Davidlohr Bueso
	<dave@...olabs.net>, Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny
	<ira.weiny@...el.com>
Subject: Re: [PATCH v3 2/3] cxl/region: Support to calculate memory tier
 abstract distance

On Tue, 18 Jun 2024 16:46:38 +0800
Huang Ying <ying.huang@...el.com> wrote:

> An abstract distance value must be assigned by the driver that makes
> the memory available to the system. It reflects relative performance
> and is used to place memory nodes backed by CXL regions in the appropriate
> memory tiers allowing promotion/demotion within the existing memory tiering
> mechanism.
> 
> The abstract distance is calculated based on the memory access latency
> and bandwidth of CXL regions.
> 
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Acked-by: Dan Williams <dan.j.williams@...el.com>
LGTM
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>