linux-kernel - Re: [PATCH 0/7] ACPI HMAT memory sysfs representation

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Message-ID: <1ed406b2-b85f-8e02-1df0-7c39aa21eca9@arm.com>
Date:   Fri, 16 Nov 2018 11:57:58 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Keith Busch <keith.busch@...el.com>, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-mm@...ck.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Wysocki <rafael@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH 0/7] ACPI HMAT memory sysfs representation

On 11/15/2018 04:19 AM, Keith Busch wrote:
> This series provides a new sysfs representation for heterogeneous
> system memory.
> 
> The previous series that was specific to HMAT that this series was based
> on was last posted here: https://lkml.org/lkml/2017/12/13/968
> 
> Platforms may provide multiple types of cpu attached system memory. The
> memory ranges for each type may have different characteristics that
> applications may wish to know about when considering what node they want
> their memory allocated from. 
> 
> It had previously been difficult to describe these setups as memory
> rangers were generally lumped into the NUMA node of the CPUs. New
> platform attributes have been created and in use today that describe
> the more complex memory hierarchies that can be created.
> 
> This series first creates new generic APIs under the kernel's node
> representation. These new APIs can be used to create links among local
> memory and compute nodes and export characteristics about the memory
> nodes. Documentation desribing the new representation are provided.
> 
> Finally the series adds a kernel user for these new APIs from parsing
> the ACPI HMAT.

Not able to see the patches from this series either on the list or on the
archive (https://lkml.org/lkml/2018/11/15/331). IIRC last time we discussed
about this and the concern which I raised was in absence of a broader NUMA
rework for multi attribute memory it might not a good idea to settle down
and freeze sysfs interface for the user space.