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

[Dan Williams]

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@xxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
> Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> Cc: Bharata B Rao <bharata@xxxxxxx>
> Cc: Alistair Popple <apopple@xxxxxxxxxx>
> Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
> ---
> 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@xxxxxxxxx/
> 
> ---
>  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@xxxxxxxxx>