Re: [HMM v17 00/14] HMM (Heterogeneous Memory Management) v17

From: Balbir Singh
Date: Wed Feb 22 2017 - 02:19:35 EST

On Fri, Jan 27, 2017 at 05:52:07PM -0500, Jérôme Glisse wrote:
> Cliff note: HMM offers 2 things (each standing on its own). First
> it allows to use device memory transparently inside any process
> without any modifications to process program code. Second it allows
> to mirror process address space on a device.
> Change since v16:
> - move HMM unaddressable device memory to its own radix tree and
> thus find_dev_pagemap() will no longer return HMM dev_pagemap
> - rename HMM migration helper (drop the prefix) and make them
> completely independent of HMM
> Migration can now be use to implement thing like multi-threaded
> copy or make use of specific memory allocator for destination
> memory.
> Work is under way to use this feature inside nouveau (the upstream
> open source driver for NVidia GPU) either 411 or 4.12 timeframe.
> But this patchset have been otherwise tested with the close source
> driver for NVidia GPU and thus we are confident it works and allow
> to use the hardware for seamless interaction between CPU and GPU
> in common address space of a process.
> I also discussed the features with other company and i am confident
> it can be use on other, yet, unrelease hardware.
> Please condiser applying for 4.11

Andrew, do we expect to get this in 4.11/4.12? Just curious.

Balbir Singh.