linux-kernel - Re: [PATCH] acpi/hmat,mm/memtier: always register hmat adist calculation callback

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Message-ID: <Zs3jqGe8IXHT499B@PC2K9PVX.TheFacebook.com>
Date: Tue, 27 Aug 2024 10:33:12 -0400
From: Gregory Price <gourry@...rry.net>
To: "Huang, Ying" <ying.huang@...el.com>
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, dave.jiang@...el.com,
	Jonathan.Cameron@...wei.com, horenchuang@...edance.com,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	dan.j.williams@...el.com, lenb@...nel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Subject: Re: [PATCH] acpi/hmat,mm/memtier: always register hmat adist
 calculation callback

On Wed, Jul 31, 2024 at 09:22:32AM +0800, Huang, Ying wrote:
> >
> > This presumes driver configured devices, which is not always the case.
> >
> > kmem.c will set MEMTIER_DEFAULT_DAX_ADISTANCE
> >
> > but if BIOS/EFI has set up the node instead, you get the default of
> > MEMTIER_ADISTANCE_DRAM if HMAT is not present or otherwise not sane.
> 
> "efi_fake_mem=" kernel parameter can be used to add "EFI_MEMORY_SP" flag
> to the memory range, so that kmem.c can manage it.
> 

Worth noting:  This feature was removed
https://lore.kernel.org/all/20240620073205.1543145-1-ardb+git@google.com/

So I cannot even use this to manage it.

~Gregory