From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: "Balbir Singh" <bsingharora@gmail.com>,
linux-mm <linux-mm@kvack.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"Anshuman Khandual" <khandual@linux.vnet.ibm.com>,
"Aneesh Kumar KV" <aneesh.kumar@linux.vnet.ibm.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
"Srikar Dronamraju" <srikar@linux.vnet.ibm.com>,
"Haren Myneni" <haren@linux.vnet.ibm.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Reza Arbab" <arbab@linux.vnet.ibm.com>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Christoph Lameter" <cl@linux.com>,
"Rik van Riel" <riel@redhat.com>
Subject: Re: [RFC summary] Enable Coherent Device Memory
Date: Thu, 18 May 2017 05:35:38 +1000 [thread overview]
Message-ID: <1495049738.3092.36.camel@kernel.crashing.org> (raw)
In-Reply-To: <20170517105812.plj54qwbr334w5r5@techsingularity.net>
On Wed, 2017-05-17 at 11:58 +0100, Mel Gorman wrote:
> Remember that this will include the page table pages which may or may
> not be what you want.
It is fine. The GPU does translation using ATS, so the page tables are
effectively accessed by the nest MMU in the corresponding P9 chip, not
by the GPU itself. Thus we do want them to reside in system memory.
Cheers,
Ben.
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next prev parent reply other threads:[~2017-05-17 19:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-12 6:18 [RFC summary] Enable Coherent Device Memory Balbir Singh
2017-05-12 10:26 ` Mel Gorman
2017-05-15 23:45 ` Balbir Singh
2017-05-16 8:43 ` Mel Gorman
2017-05-16 22:26 ` Benjamin Herrenschmidt
2017-05-17 8:28 ` Mel Gorman
2017-05-17 9:03 ` Benjamin Herrenschmidt
2017-05-17 9:15 ` Mel Gorman
2017-05-17 9:56 ` Benjamin Herrenschmidt
2017-05-17 10:58 ` Mel Gorman
2017-05-17 19:35 ` Benjamin Herrenschmidt [this message]
2017-05-17 19:37 ` Benjamin Herrenschmidt
2017-05-17 12:41 ` Michal Hocko
2017-05-17 13:54 ` Christoph Lameter
2017-05-17 19:39 ` Benjamin Herrenschmidt
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