linux-kernel - Re: [PATCH 4/5] hmm: heterogeneous memory management v6

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Message-ID: <545D3B3D.50907@redhat.com>
Date:	Fri, 07 Nov 2014 16:35:57 -0500
From:	Rik van Riel <riel@...hat.com>
To:	j.glisse@...il.com, akpm@...ux-foundation.org
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	joro@...tes.org, Mel Gorman <mgorman@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Dave Airlie <airlied@...hat.com>,
	Brendan Conoboy <blc@...hat.com>,
	Joe Donohue <jdonohue@...hat.com>,
	Duncan Poole <dpoole@...dia.com>,
	Sherry Cheung <SCheung@...dia.com>,
	Subhash Gutti <sgutti@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Lucien Dunning <ldunning@...dia.com>,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Arvind Gopalakrishnan <arvindg@...dia.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Liran Liss <liranl@...lanox.com>,
	Roland Dreier <roland@...estorage.com>,
	Ben Sander <ben.sander@....com>,
	Greg Stoner <Greg.Stoner@....com>,
	John Bridgman <John.Bridgman@....com>,
	Michael Mantor <Michael.Mantor@....com>,
	Paul Blinzer <Paul.Blinzer@....com>,
	Laurent Morichetti <Laurent.Morichetti@....com>,
	Alexander Deucher <Alexander.Deucher@....com>,
	Oded Gabbay <Oded.Gabbay@....com>,
	Jérôme Glisse <jglisse@...hat.com>,
	Jatin Kumar <jakumar@...dia.com>
Subject: Re: [PATCH 4/5] hmm: heterogeneous memory management v6

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On 11/03/2014 03:42 PM, j.glisse@...il.com wrote:
> From: Jérôme Glisse <jglisse@...hat.com>
> 
> Motivation:
> 
> Heterogeneous memory management is intended to allow a device to
> transparently access a process address space without having to lock
> pages of the process or take references on them. In other word
> mirroring a process address space while allowing the regular memory
> management event such as page reclamation or page migration, to
> happen seamlessly.
> 
> Recent years have seen a surge into the number of specialized
> devices that are part of a computer platform (from desktop to
> phone). So far each of those devices have operated on there own
> private address space that is not link or expose to the process
> address space that is using them. This separation often leads to
> multiple memory copy happening between the device owned memory and
> the process memory. This of course is both a waste of cpu cycle and
> memory.
> 
> Over the last few years most of those devices have gained a full
> mmu allowing them to support multiple page table, page fault and
> other features that are found inside cpu mmu. There is now a strong
> incentive to start leveraging capabilities of such devices and to
> start sharing process address to avoid any unnecessary memory copy
> as well as simplifying the programming model of those devices by
> sharing an unique and common address space with the process that
> use them.
> 
> The aim of the heterogeneous memory management is to provide a
> common API that can be use by any such devices in order to mirror
> process address. The hmm code provide an unique entry point and
> interface itself with the core mm code of the linux kernel avoiding
> duplicate implementation and shielding device driver code from core
> mm code.

Acked-by: Rik van Riel <riel@...hat.com>

- -- 
All rights reversed
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