linux-kernel - Re: [PATCH v3 0/3] create sysfs representation of ACPI HMAT

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Date:   Fri, 22 Dec 2017 15:31:54 -0700
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        "Anaczkowski, Lukasz" <lukasz.anaczkowski@...el.com>,
        "Box, David E" <david.e.box@...el.com>,
        "Kogut, Jaroslaw" <Jaroslaw.Kogut@...el.com>,
        "Koss, Marcin" <marcin.koss@...el.com>,
        "Koziej, Artur" <artur.koziej@...el.com>,
        "Lahtinen, Joonas" <joonas.lahtinen@...el.com>,
        "Moore, Robert" <robert.moore@...el.com>,
        "Nachimuthu, Murugasamy" <murugasamy.nachimuthu@...el.com>,
        "Odzioba, Lukasz" <lukasz.odzioba@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Schmauss, Erik" <erik.schmauss@...el.com>,
        "Verma, Vishal L" <vishal.l.verma@...el.com>,
        "Zheng, Lv" <lv.zheng@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Balbir Singh <bsingharora@...il.com>,
        Brice Goglin <brice.goglin@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Len Brown <lenb@...nel.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>, devel@...ica.org,
        linux-acpi@...r.kernel.org, linux-mm@...ck.org,
        linux-nvdimm@...ts.01.org
Subject: Re: [PATCH v3 0/3] create sysfs representation of ACPI HMAT

On Fri, Dec 22, 2017 at 08:39:41AM +0530, Anshuman Khandual wrote:
> On 12/14/2017 07:40 AM, Ross Zwisler wrote:
<>
> > We solve this issue by providing userspace with performance information on
> > individual memory ranges.  This performance information is exposed via
> > sysfs:
> > 
> >   # grep . mem_tgt2/* mem_tgt2/local_init/* 2>/dev/null
> >   mem_tgt2/firmware_id:1
> >   mem_tgt2/is_cached:0
> >   mem_tgt2/local_init/read_bw_MBps:40960
> >   mem_tgt2/local_init/read_lat_nsec:50
> >   mem_tgt2/local_init/write_bw_MBps:40960
> >   mem_tgt2/local_init/write_lat_nsec:50
<>
> We will enlist properties for all possible "source --> target" on the system?

Nope, just 'local' initiator/target pairs.  I talk about the reasoning for
this in the cover letter for patch 3:

https://lists.01.org/pipermail/linux-nvdimm/2017-December/013574.html

> Right now it shows only bandwidth and latency properties, can it accommodate
> other properties as well in future ?

We also have an 'is_cached' attribute for the memory targets if they are
involved in a caching hierarchy, but right now those are all the things we
expose.  We can potentially expose whatever we want that is present in the
HMAT, but those seemed like a good start.

I noticed that in your presentation you had some other examples of attributes
you cared about:

 * reliability
 * power consumption
 * density

The HMAT doesn't provide this sort of information at present, but we
could/would add them to sysfs if the HMAT ever grew support for them.

> > This allows applications to easily find the memory that they want to use.
> > We expect that the existing NUMA APIs will be enhanced to use this new
> > information so that applications can continue to use them to select their
> > desired memory.
> 
> I had presented a proposal for NUMA redesign in the Plumbers Conference this
> year where various memory devices with different kind of memory attributes
> can be represented in the kernel and be used explicitly from the user space.
> Here is the link to the proposal if you feel interested. The proposal is
> very intrusive and also I dont have a RFC for it yet for discussion here.
> 
> https://linuxplumbersconf.org/2017/ocw//system/presentations/4656/original/Hierarchical_NUMA_Design_Plumbers_2017.pdf
> 
> Problem is, designing the sysfs interface for memory attribute detection
> from user space without first thinking about redesigning the NUMA for
> heterogeneous memory may not be a good idea. Will look into this further.

I took another look at your presentation, and overall I think that if/when a
NUMA redesign like this takes place ACPI systems with HMAT tables will be able
to participate.  But I think we are probably a ways away from that, and like I
said in my previous mail ACPI systems with memory-only NUMA nodes are going to
exist and need to be supported with the current NUMA scheme.  Hence I don't
think that this patch series conflicts with your proposal.