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

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Message-ID: <Zp/C6YgwiK9r0l4w@devbig133.nha1.facebook.com>
Date: Tue, 23 Jul 2024 07:49:13 -0700
From: Gregory Price <gourry@...rry.net>
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>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	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, Jun 18, 2024 at 04:46:38PM +0800, Huang Ying 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>

Reviewed-by: Gregory Price <gourry@...rry.net>