From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Christoph Lameter <cl@linux.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,
riel@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: Sat, 25 Apr 2015 04:49:35 -0700 [thread overview]
Message-ID: <20150425114935.GK5561@linux.vnet.ibm.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1504241048490.9889@gentwo.org>
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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WARNING: multiple messages have this Message-ID (diff)
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Christoph Lameter <cl@linux.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,
riel@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: Sat, 25 Apr 2015 04:49:35 -0700 [thread overview]
Message-ID: <20150425114935.GK5561@linux.vnet.ibm.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1504241048490.9889@gentwo.org>
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
next prev parent reply other threads:[~2015-04-25 11:49 UTC|newest]
Thread overview: 193+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-21 21:44 Interacting with coherent memory on external devices Paul E. McKenney
2015-04-21 21:44 ` Paul E. McKenney
2015-04-21 23:46 ` Jerome Glisse
2015-04-21 23:46 ` Jerome Glisse
2015-04-22 0:36 ` Benjamin Herrenschmidt
2015-04-22 0:36 ` Benjamin Herrenschmidt
2015-04-22 12:42 ` Paul E. McKenney
2015-04-22 12:42 ` Paul E. McKenney
2015-04-21 23:49 ` Christoph Lameter
2015-04-21 23:49 ` Christoph Lameter
2015-04-22 0:05 ` Jerome Glisse
2015-04-22 0:05 ` Jerome Glisse
2015-04-22 0:50 ` Christoph Lameter
2015-04-22 0:50 ` Christoph Lameter
2015-04-22 1:01 ` Benjamin Herrenschmidt
2015-04-22 1:01 ` Benjamin Herrenschmidt
2015-04-22 13:35 ` Paul E. McKenney
2015-04-22 13:35 ` Paul E. McKenney
2015-04-22 13:18 ` Paul E. McKenney
2015-04-22 13:18 ` Paul E. McKenney
2015-04-22 16:16 ` Christoph Lameter
2015-04-22 16:16 ` Christoph Lameter
2015-04-22 17:07 ` Jerome Glisse
2015-04-22 17:07 ` Jerome Glisse
2015-04-22 18:17 ` Christoph Lameter
2015-04-22 18:17 ` Christoph Lameter
2015-04-22 18:52 ` Paul E. McKenney
2015-04-22 18:52 ` Paul E. McKenney
2015-04-23 14:12 ` Christoph Lameter
2015-04-23 14:12 ` Christoph Lameter
2015-04-23 19:24 ` Paul E. McKenney
2015-04-23 19:24 ` Paul E. McKenney
2015-04-24 14:01 ` Christoph Lameter
2015-04-24 14:01 ` Christoph Lameter
2015-04-24 14:13 ` Paul E. McKenney
2015-04-24 14:13 ` Paul E. McKenney
2015-04-24 15:53 ` Rik van Riel
2015-04-24 15:53 ` Rik van Riel
2015-04-23 2:36 ` Benjamin Herrenschmidt
2015-04-23 2:36 ` Benjamin Herrenschmidt
2015-04-23 14:10 ` Christoph Lameter
2015-04-23 14:10 ` Christoph Lameter
2015-04-23 15:42 ` Jerome Glisse
2015-04-23 15:42 ` Jerome Glisse
2015-04-24 14:04 ` Christoph Lameter
2015-04-24 14:04 ` Christoph Lameter
2015-04-23 22:29 ` Benjamin Herrenschmidt
2015-04-23 22:29 ` Benjamin Herrenschmidt
2015-04-23 2:30 ` Benjamin Herrenschmidt
2015-04-23 2:30 ` Benjamin Herrenschmidt
2015-04-23 14:25 ` Christoph Lameter
2015-04-23 14:25 ` Christoph Lameter
2015-04-23 15:25 ` Austin S Hemmelgarn
2015-04-23 19:33 ` Paul E. McKenney
2015-04-23 19:33 ` Paul E. McKenney
2015-04-24 14:12 ` Christoph Lameter
2015-04-24 14:12 ` Christoph Lameter
2015-04-24 14:57 ` Paul E. McKenney
2015-04-24 14:57 ` Paul E. McKenney
2015-04-24 15:09 ` Jerome Glisse
2015-04-24 15:09 ` Jerome Glisse
2015-04-25 11:20 ` Paul E. McKenney
2015-04-25 11:20 ` Paul E. McKenney
2015-04-24 15:52 ` Christoph Lameter
2015-04-24 15:52 ` Christoph Lameter
2015-04-23 22:37 ` Benjamin Herrenschmidt
2015-04-23 22:37 ` Benjamin Herrenschmidt
2015-04-24 14:09 ` Christoph Lameter
2015-04-24 14:09 ` Christoph Lameter
2015-04-23 16:04 ` Rik van Riel
2015-04-23 16:04 ` Rik van Riel
2015-04-22 0:42 ` Benjamin Herrenschmidt
2015-04-22 0:42 ` Benjamin Herrenschmidt
2015-04-22 0:57 ` Paul E. McKenney
2015-04-22 0:57 ` Paul E. McKenney
2015-04-22 1:04 ` Benjamin Herrenschmidt
2015-04-22 1:04 ` Benjamin Herrenschmidt
2015-04-22 15:25 ` Christoph Lameter
2015-04-22 15:25 ` Christoph Lameter
2015-04-22 16:31 ` Jerome Glisse
2015-04-22 16:31 ` Jerome Glisse
2015-04-22 17:14 ` Christoph Lameter
2015-04-22 17:14 ` Christoph Lameter
2015-04-22 19:07 ` Jerome Glisse
2015-04-22 19:07 ` Jerome Glisse
2015-04-23 2:34 ` Benjamin Herrenschmidt
2015-04-23 2:34 ` Benjamin Herrenschmidt
2015-04-23 14:38 ` Christoph Lameter
2015-04-23 14:38 ` Christoph Lameter
2015-04-23 16:11 ` Jerome Glisse
2015-04-23 16:11 ` Jerome Glisse
2015-04-24 14:29 ` Christoph Lameter
2015-04-24 14:29 ` Christoph Lameter
2015-04-24 15:08 ` Jerome Glisse
2015-04-24 15:08 ` Jerome Glisse
2015-04-24 16:03 ` Christoph Lameter
2015-04-24 16:03 ` Christoph Lameter
2015-04-24 16:43 ` Jerome Glisse
2015-04-24 16:43 ` Jerome Glisse
2015-04-24 16:58 ` Christoph Lameter
2015-04-24 16:58 ` Christoph Lameter
2015-04-24 17:19 ` Jerome Glisse
2015-04-24 17:19 ` Jerome Glisse
2015-04-24 18:56 ` Christoph Lameter
2015-04-24 18:56 ` Christoph Lameter
2015-04-24 19:29 ` Jerome Glisse
2015-04-24 19:29 ` Jerome Glisse
2015-04-24 20:00 ` Christoph Lameter
2015-04-24 20:00 ` Christoph Lameter
2015-04-24 20:32 ` Jerome Glisse
2015-04-24 20:32 ` Jerome Glisse
2015-04-25 11:46 ` Paul E. McKenney
2015-04-25 11:46 ` Paul E. McKenney
2015-04-27 15:08 ` Christoph Lameter
2015-04-27 15:08 ` Christoph Lameter
2015-04-27 15:47 ` Jerome Glisse
2015-04-27 15:47 ` Jerome Glisse
2015-04-27 16:17 ` Christoph Lameter
2015-04-27 16:17 ` Christoph Lameter
2015-04-27 16:29 ` Rik van Riel
2015-04-27 16:29 ` Rik van Riel
2015-04-27 16:48 ` Christoph Lameter
2015-04-27 16:48 ` Christoph Lameter
2015-04-27 23:54 ` Benjamin Herrenschmidt
2015-04-27 23:54 ` Benjamin Herrenschmidt
2015-05-13 14:10 ` Vlastimil Babka
2015-05-13 14:10 ` Vlastimil Babka
2015-05-13 23:38 ` Benjamin Herrenschmidt
2015-05-13 23:38 ` Benjamin Herrenschmidt
2015-05-14 7:39 ` Vlastimil Babka
2015-05-14 7:39 ` Vlastimil Babka
2015-05-14 7:51 ` Benjamin Herrenschmidt
2015-05-14 7:51 ` Benjamin Herrenschmidt
2015-05-28 18:18 ` Paul E. McKenney
2015-05-28 18:18 ` Paul E. McKenney
2015-04-27 16:43 ` Jerome Glisse
2015-04-27 16:43 ` Jerome Glisse
2015-04-27 16:51 ` Christoph Lameter
2015-04-27 16:51 ` Christoph Lameter
2015-04-27 17:21 ` Jerome Glisse
2015-04-27 17:21 ` Jerome Glisse
2015-04-27 19:26 ` Christoph Lameter
2015-04-27 19:26 ` Christoph Lameter
2015-04-27 19:35 ` Rik van Riel
2015-04-27 19:35 ` Rik van Riel
2015-04-27 20:52 ` Jerome Glisse
2015-04-27 20:52 ` Jerome Glisse
2015-04-28 14:18 ` Christoph Lameter
2015-04-28 14:18 ` Christoph Lameter
2015-04-28 17:20 ` Jerome Glisse
2015-04-28 17:20 ` Jerome Glisse
2015-04-27 16:15 ` Paul E. McKenney
2015-04-27 16:15 ` Paul E. McKenney
2015-04-27 16:31 ` Christoph Lameter
2015-04-27 16:31 ` Christoph Lameter
2015-04-24 23:45 ` Benjamin Herrenschmidt
2015-04-24 23:45 ` Benjamin Herrenschmidt
2015-04-23 18:52 ` Paul E. McKenney
2015-04-23 18:52 ` Paul E. McKenney
2015-04-24 14:30 ` Christoph Lameter
2015-04-24 14:30 ` Christoph Lameter
2015-04-24 14:54 ` Paul E. McKenney
2015-04-24 14:54 ` Paul E. McKenney
2015-04-24 15:49 ` Christoph Lameter
2015-04-24 15:49 ` Christoph Lameter
2015-04-24 16:06 ` Rik van Riel
2015-04-24 16:06 ` Rik van Riel
2015-04-25 11:49 ` Paul E. McKenney [this message]
2015-04-25 11:49 ` Paul E. McKenney
2015-04-24 16:00 ` Jerome Glisse
2015-04-24 16:00 ` Jerome Glisse
2015-04-24 16:08 ` Rik van Riel
2015-04-24 16:08 ` Rik van Riel
2015-04-23 17:28 ` Rik van Riel
2015-04-23 17:28 ` Rik van Riel
2015-04-23 2:27 ` Benjamin Herrenschmidt
2015-04-23 2:27 ` Benjamin Herrenschmidt
2015-04-23 14:20 ` Christoph Lameter
2015-04-23 14:20 ` Christoph Lameter
2015-04-23 16:22 ` Jerome Glisse
2015-04-23 16:22 ` Jerome Glisse
2015-04-24 18:41 ` Oded Gabbay
2015-04-24 18:41 ` Oded Gabbay
2015-04-23 19:00 ` Paul E. McKenney
2015-04-23 19:00 ` Paul E. McKenney
2015-04-22 15:20 ` Christoph Lameter
2015-04-22 15:20 ` Christoph Lameter
2015-04-25 2:32 ` Rik van Riel
2015-04-25 2:32 ` Rik van Riel
2015-04-25 3:32 ` Benjamin Herrenschmidt
2015-04-25 3:32 ` Benjamin Herrenschmidt
2015-04-25 11:55 ` Paul E. McKenney
2015-04-25 11:55 ` Paul E. McKenney
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