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

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Message-ID: <20181116155141.GA14630@localhost.localdomain>
Date:   Fri, 16 Nov 2018 08:51:41 -0700
From:   Keith Busch <keith.busch@...el.com>
To:     Anshuman Khandual <anshuman.khandual@....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 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

> 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.