linux-ext4 - BoF at LPC: Documenting the Heterogeneous Memory Model Architecture

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Date:   Tue, 21 Sep 2021 15:19:02 -0400
From:   Felix Kuehling <felix.kuehling@....com>
To:     Linux MM <linux-mm@...ck.org>, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     Christoph Hellwig <hch@....de>, Jason Gunthorpe <jgg@...lanox.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Theodore Ts'o <tytso@....edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Peter Zijlstra <peterz@...radead.org>,
        "Phillips, Daniel" <Daniel.Phillips@....com>,
        "Sierra Guiza, Alejandro (Alex)" <Alex.Sierra@....com>
Subject: BoF at LPC: Documenting the Heterogeneous Memory Model Architecture

As the programming models for GPU-based high-performance computing 
applications are evolving, HMM is helping us integrate the GPU memory 
management more closely with the kernel's virtual memory management. As 
a result we can provide a shared virtual address space with 
demand-paging and page-based migrations of anonymous pages to/from 
device memory. A patch series by AMD [1, 2] to add support for 
cache-coherent, CPU-accessible device memory has brought up some fairly 
fundamental questions about HMM and its interaction with virtual memory 
management, page cache and file systems. We'd like to use the chance of 
getting together for a BoF [3] at LPC to raise awareness for HMM outside 
the GPU driver code, identify gaps in the architectural documentation 
and clarify our priorities for future development.

Thank you, Daniel, for suggesting the BoF and getting it scheduled. It's 
set for Friday, 10am Pacific, 1pm Eastern, 5pm UTC.

I am registered at LPC. Daniel got a speaker's pass. We're still trying 
to work something out for Alex.

I hope to see many of you on Friday.

Best regards,
   Felix

[1] https://patchwork.freedesktop.org/series/94611/
[2] https://patchwork.freedesktop.org/series/90706/
[3] https://linuxplumbersconf.org/event/11/contributions/1123/

-- 
F e l i x   K u e h l i n g
PMTS Software Development Engineer | Linux Compute Kernel
1 Commerce Valley Dr. East, Markham, ON L3T 7X6 Canada
(O) +1(289)695-1597
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