linux-kernel - Re: [RFC PATCH 02/14] mm/hms: heterogenenous memory system (HMS) documentation

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Date:   Wed, 5 Dec 2018 16:23:42 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Jerome Glisse <jglisse@...hat.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>, Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Haggai Eran <haggaie@...lanox.com>, balbirs@....ibm.com,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "Kuehling, Felix" <felix.kuehling@....com>, Philip.Yang@....com,
        "Koenig, Christian" <christian.koenig@....com>,
        "Blinzer, Paul" <Paul.Blinzer@....com>,
        John Hubbard <jhubbard@...dia.com>, rcampbell@...dia.com
Subject: Re: [RFC PATCH 02/14] mm/hms: heterogenenous memory system (HMS)
 documentation



On 2018-12-05 4:20 p.m., Jerome Glisse wrote:
> And my proposal is under /sys/bus and have symlink to all existing
> device it agregate in there.

That's so not the point. Use the existing buses don't invent some
virtual tree. I don't know how many times I have to say this or in how
many ways. I'm not responding anymore.

> So you agree with my proposal ? A sysfs directory in which all the
> bus and how they are connected to each other and what is connected
> to each of them (device, CPU, memory).

I'm fine with the motivation. What I'm arguing against is the
implementation and the fact you have to create a whole grand new
userspace API and hierarchy to accomplish it.

Logan