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

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Message-ID: <415d842c-1fc9-1f15-640b-6d6c0f9611e2@arm.com>
Date:   Mon, 19 Nov 2018 07:22:11 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Keith Busch <keith.busch@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-mm@...ck.org,
        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 11/16/2018 09:21 PM, Keith Busch wrote:
> On Fri, Nov 16, 2018 at 11:57:58AM +0530, Anshuman Khandual wrote:
>> 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). 
> 
> The send-email split the cover-letter from the series, probably
> something I did. Series followed immediately after:
> 
>   https://lkml.org/lkml/2018/11/15/332

Yeah got it. I can see the series on the list. Thanks for pointing out.

> 
>> 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. 
>