From: Rik van Riel <riel@redhat.com>
To: Christoph Lameter <cl@linux.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Jerome Glisse <j.glisse@gmail.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
jglisse@redhat.com, mgorman@suse.de, aarcange@redhat.com,
airlied@redhat.com, aneesh.kumar@linux.vnet.ibm.com,
Cameron Buschardt <cabuschardt@nvidia.com>,
Mark Hairgrove <mhairgrove@nvidia.com>,
Geoffrey Gerfin <ggerfin@nvidia.com>,
John McKenna <jmckenna@nvidia.com>,
akpm@linux-foundation.org
Subject: Re: Interacting with coherent memory on external devices
Date: Fri, 24 Apr 2015 12:08:52 -0400 [thread overview]
Message-ID: <553A6A94.1010508@redhat.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1504240929340.7582@gentwo.org>
On 04/24/2015 10:30 AM, Christoph Lameter wrote:
> On Thu, 23 Apr 2015, Paul E. McKenney wrote:
>
>> If by "entire industry" you mean everyone who might want to use hardware
>> acceleration, for example, including mechanical computer-aided design,
>> I am skeptical.
>
> The industry designs GPUs with super fast special ram and accellerators
> with special ram designed to do fast searches and you think you can demand page
> that stuff in from the main processor?
DRAM access latencies are a few hundred CPU cycles, but somehow
CPUs can still do computations at a fast speed, and we do not
require gigabytes of L2-cache-speed memory in the system.
It turns out the vast majority of programs have working sets,
and data access patterns where prefetching works satisfactorily.
With GPU calculations done transparently by libraries, and
largely hidden from programs, why would this be any different?
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next prev parent reply other threads:[~2015-04-24 16:09 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-21 21:44 Paul E. McKenney
2015-04-21 23:46 ` Jerome Glisse
2015-04-22 0:36 ` Benjamin Herrenschmidt
2015-04-22 12:42 ` Paul E. McKenney
2015-04-21 23:49 ` Christoph Lameter
2015-04-22 0:05 ` Jerome Glisse
2015-04-22 0:50 ` Christoph Lameter
2015-04-22 1:01 ` Benjamin Herrenschmidt
2015-04-22 13:35 ` Paul E. McKenney
2015-04-22 13:18 ` Paul E. McKenney
2015-04-22 16:16 ` Christoph Lameter
2015-04-22 17:07 ` Jerome Glisse
2015-04-22 18:17 ` Christoph Lameter
2015-04-22 18:52 ` Paul E. McKenney
2015-04-23 14:12 ` Christoph Lameter
2015-04-23 19:24 ` Paul E. McKenney
2015-04-24 14:01 ` Christoph Lameter
2015-04-24 14:13 ` Paul E. McKenney
2015-04-24 15:53 ` Rik van Riel
2015-04-23 2:36 ` Benjamin Herrenschmidt
2015-04-23 14:10 ` Christoph Lameter
2015-04-23 15:42 ` Jerome Glisse
2015-04-24 14:04 ` Christoph Lameter
2015-04-23 22:29 ` Benjamin Herrenschmidt
2015-04-23 2:30 ` Benjamin Herrenschmidt
2015-04-23 14:25 ` Christoph Lameter
2015-04-23 15:25 ` Austin S Hemmelgarn
2015-04-23 19:33 ` Paul E. McKenney
2015-04-24 14:12 ` Christoph Lameter
2015-04-24 14:57 ` Paul E. McKenney
2015-04-24 15:09 ` Jerome Glisse
2015-04-25 11:20 ` Paul E. McKenney
2015-04-24 15:52 ` Christoph Lameter
2015-04-23 22:37 ` Benjamin Herrenschmidt
2015-04-24 14:09 ` Christoph Lameter
2015-04-23 16:04 ` Rik van Riel
2015-04-22 0:42 ` Benjamin Herrenschmidt
2015-04-22 0:57 ` Paul E. McKenney
2015-04-22 1:04 ` Benjamin Herrenschmidt
2015-04-22 15:25 ` Christoph Lameter
2015-04-22 16:31 ` Jerome Glisse
2015-04-22 17:14 ` Christoph Lameter
2015-04-22 19:07 ` Jerome Glisse
2015-04-23 2:34 ` Benjamin Herrenschmidt
2015-04-23 14:38 ` Christoph Lameter
2015-04-23 16:11 ` Jerome Glisse
2015-04-24 14:29 ` Christoph Lameter
2015-04-24 15:08 ` Jerome Glisse
2015-04-24 16:03 ` Christoph Lameter
2015-04-24 16:43 ` Jerome Glisse
2015-04-24 16:58 ` Christoph Lameter
2015-04-24 17:19 ` Jerome Glisse
2015-04-24 18:56 ` Christoph Lameter
2015-04-24 19:29 ` Jerome Glisse
2015-04-24 20:00 ` Christoph Lameter
2015-04-24 20:32 ` Jerome Glisse
2015-04-25 11:46 ` Paul E. McKenney
2015-04-27 15:08 ` Christoph Lameter
2015-04-27 15:47 ` Jerome Glisse
2015-04-27 16:17 ` Christoph Lameter
2015-04-27 16:29 ` Rik van Riel
2015-04-27 16:48 ` Christoph Lameter
2015-04-27 23:54 ` Benjamin Herrenschmidt
2015-05-13 14:10 ` Vlastimil Babka
2015-05-13 23:38 ` Benjamin Herrenschmidt
2015-05-14 7:39 ` Vlastimil Babka
2015-05-14 7:51 ` Benjamin Herrenschmidt
2015-05-28 18:18 ` Paul E. McKenney
2015-04-27 16:43 ` Jerome Glisse
2015-04-27 16:51 ` Christoph Lameter
2015-04-27 17:21 ` Jerome Glisse
2015-04-27 19:26 ` Christoph Lameter
2015-04-27 19:35 ` Rik van Riel
2015-04-27 20:52 ` Jerome Glisse
2015-04-28 14:18 ` Christoph Lameter
2015-04-28 17:20 ` Jerome Glisse
2015-04-27 16:15 ` Paul E. McKenney
2015-04-27 16:31 ` Christoph Lameter
2015-04-24 23:45 ` Benjamin Herrenschmidt
2015-04-23 18:52 ` Paul E. McKenney
2015-04-24 14:30 ` Christoph Lameter
2015-04-24 14:54 ` Paul E. McKenney
2015-04-24 15:49 ` Christoph Lameter
2015-04-24 16:06 ` Rik van Riel
2015-04-25 11:49 ` Paul E. McKenney
2015-04-24 16:00 ` Jerome Glisse
2015-04-24 16:08 ` Rik van Riel [this message]
2015-04-23 17:28 ` Rik van Riel
2015-04-23 2:27 ` Benjamin Herrenschmidt
2015-04-23 14:20 ` Christoph Lameter
2015-04-23 16:22 ` Jerome Glisse
2015-04-24 18:41 ` Oded Gabbay
2015-04-23 19:00 ` Paul E. McKenney
2015-04-22 15:20 ` Christoph Lameter
2015-04-25 2:32 ` Rik van Riel
2015-04-25 3:32 ` Benjamin Herrenschmidt
2015-04-25 11:55 ` Paul E. McKenney
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