linux-kernel - Re: Interacting with coherent memory on external devices

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Message-ID: <alpine.DEB.2.11.1504240904530.7582@gentwo.org>
Date:	Fri, 24 Apr 2015 09:09:12 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Austin S Hemmelgarn <ahferroin7@...il.com>
cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jerome Glisse <j.glisse@...il.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	jglisse@...hat.com, mgorman@...e.de, aarcange@...hat.com,
	riel@...hat.com, airlied@...hat.com,
	aneesh.kumar@...ux.vnet.ibm.com,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Geoffrey Gerfin <ggerfin@...dia.com>,
	John McKenna <jmckenna@...dia.com>, akpm@...ux-foundation.org
Subject: Re: Interacting with coherent memory on external devices

On Thu, 23 Apr 2015, Austin S Hemmelgarn wrote:

> Looking at this whole conversation, all I see is two different views on how to
> present the asymmetric multiprocessing arrangements that have become
> commonplace in today's systems to userspace.  Your model favors performance,
> while CAPI favors simplicity for userspace.

Oww. No performance just simplicity? Really?

The simplification of the memory registration for Infiniband etc is
certainly useful and I hope to see contributions on that going into the
kernel.


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