linux-kernel - Re: [PATCH -V2] cxl/region: Support to calculate memory tier abstract distance

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Date: Tue, 11 Jun 2024 21:22:00 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Huang Ying <ying.huang@...el.com>, Dan Williams <dan.j.williams@...el.com>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Huang Ying
	<ying.huang@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, "Jonathan
 Cameron" <Jonathan.Cameron@...wei.com>, Dave Jiang <dave.jiang@...el.com>,
	Bharata B Rao <bharata@....com>, Alistair Popple <apopple@...dia.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>
Subject: Re: [PATCH -V2] cxl/region: Support to calculate memory tier
 abstract distance

Huang Ying wrote:
> To place memory nodes backed by CXL regions in the appropriate memory
> tiers.  So that, pages can be promoted/demoted with the existing
> memory tiering mechanism.
> 
> The abstract distance is calculated based on the memory access latency
> and bandwidth of CXL regions.  Which in turn comes from the HMAT
> and CDAT, etc.
> 
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Cc: Dave Jiang <dave.jiang@...el.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Bharata B Rao <bharata@....com>
> Cc: Alistair Popple <apopple@...dia.com>
> Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> ---
> Changes:
> 
> v2:
> 
> - Added comments to struct cxl_region and minor fixes (Thanks Jonathan!)
> - Link to v1: https://lore.kernel.org/linux-cxl/20240531024852.282767-1-ying.huang@intel.com/
> 
> ---
>  drivers/cxl/core/region.c | 40 +++++++++++++++++++++++++++++++++++----
>  drivers/cxl/cxl.h         |  2 ++
>  2 files changed, 38 insertions(+), 4 deletions(-)

Looks straigtforward to me,

Acked-by: Dan Williams <dan.j.williams@...el.com>