Heterogeneous Memory Management Work Is Being Renewed For The Linux Kernel
Written by Michael Larabel in Linux Kernel on 9 March 2016 at 07:42 AM EST. 3 Comments
LINUX KERNEL --
Back in 2014 is when longtime open-source graphics driver developer Jerome Glisse began pushing his patches for Heterogeneous Memory Management in the Linux kernel while that work is still ongoing but has now been renewed.

We last heard an update on Heterogeneous Memory Management (HMM) last summer when Glisse sent out his latest patches. This big patch-set is a helper layer for a device wanting to mirror a process address space into their own MMU. HMM is designed for GPUs and others in needing to support OpenCL 2.0+ for mirroring a process address space. HMM also makes it possible for using the discrete GPU memory in a transparent manner to the application/game and other possible use-cases.

Jerome wrote on Tuesday to the kernel mailing list:
Last time I spoke with Linus and Andrew, the requirement for getting HMM upstream was having real hardware working with it beside Mellanox (as Mellanox does not use all HMM features), both with closed source driver and open source driver. Work on open source driver is underway, and I anticipate we will get update from NVIDIA and other parties on their efforts and plans shortly.

I am re-posting now because I want people to have time to look at HMM again. The open source driver will stay behind close doors until hardware is released. I can however have the upstream maintainer share his progress here if anyone feels the need for that.

Other parties such as IBM and Mediatek are also interested in HMM. I expect they will comment on their respective hardware when they can.

I hope that HMM can be considered for inclusion upstream soon.
Find out more about Linux HMM via the kernel mailing list with the code now up to its 12th revision.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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