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Message-ID: <20150425114935.GK5561@linux.vnet.ibm.com>
Date: Sat, 25 Apr 2015 04:49:35 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Christoph Lameter <cl@...ux.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
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 Fri, Apr 24, 2015 at 10:49:28AM -0500, Christoph Lameter wrote:
> On Fri, 24 Apr 2015, Paul E. McKenney wrote:
>
> > can deliver, but where the cost of full-fledge hand tuning cannot be
> > justified.
> >
> > You seem to believe that this latter category is the empty set, which
> > I must confess does greatly surprise me.
>
> If there are already compromises are being made then why would you want to
> modify the kernel for this? Some user space coding and device drivers
> should be sufficient.
The goal is to gain substantial performance improvement without any
user-space changes.
Thanx, Paul
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