From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Dave Hansen <dave.hansen@intel.com>, Jerome Glisse <jglisse@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
John Hubbard <jhubbard@nvidia.com>,
David Nellans <dnellans@nvidia.com>,
cgroups@vger.kernel.org, Dan Williams <dan.j.williams@intel.com>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Balbir Singh <balbirs@au1.ibm.com>,
Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: [HMM-CDM 0/5] Cache coherent device memory (CDM) with HMM
Date: Thu, 15 Jun 2017 08:07:56 +1000 [thread overview]
Message-ID: <1497478076.2897.46.camel@kernel.crashing.org> (raw)
In-Reply-To: <3a617630-2406-da49-707c-4959a2afd8e1@intel.com>
On Wed, 2017-06-14 at 14:58 -0700, Dave Hansen wrote:
> > > http://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf
> >
> > It doesn't interact with that. HMM-CDM is a set of helper that don't
> > do anything unless instructed so. So for device memory to be presented
> > as HMM-CDM you need to hotplug it as ZONE_DEVICE(DEVICE_PUBLIC) which
> > can be done with the helper introduced in patch 2 of this patchset.
>
> I guess I'm asking whether we *should* instruct HMM-CDM to manage all
> coherent device memory.A If not, where do we draw the line for what we
> use HMM-CDM, and for what we use the core MM?
Well, if you want the features of HMM ... It basically boils down to
whether you have some kind of coherent processing unit close to that
memory and want to manage transparent migration of pages between system
and device memory, that sort of thing.
Cheers,
Ben.
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next prev parent reply other threads:[~2017-06-14 22:08 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-14 20:11 [HMM-CDM 0/5] Cache coherent device memory (CDM) with HMM Jérôme Glisse
2017-06-14 20:11 ` [HMM-CDM 1/5] mm/device-public-memory: device memory cache coherent with CPU Jérôme Glisse
2017-06-14 20:11 ` [HMM-CDM 2/5] mm/hmm: add new helper to hotplug CDM memory region Jérôme Glisse
2017-06-15 4:28 ` Balbir Singh
2017-06-14 20:11 ` [HMM-CDM 3/5] mm/memcontrol: allow to uncharge page without using page->lru field Jérôme Glisse
2017-06-15 3:31 ` Balbir Singh
2017-06-15 15:35 ` Jerome Glisse
2017-06-14 20:11 ` [HMM-CDM 4/5] mm/memcontrol: support MEMORY_DEVICE_PRIVATE and MEMORY_DEVICE_PUBLIC Jérôme Glisse
2017-06-15 1:41 ` Balbir Singh
2017-06-15 2:04 ` Jerome Glisse
2017-06-15 3:10 ` Balbir Singh
2017-06-14 20:11 ` [HMM-CDM 5/5] mm/hmm: simplify kconfig and enable HMM and DEVICE_PUBLIC for ppc64 Jérôme Glisse
2017-06-14 23:10 ` John Hubbard
2017-06-15 2:09 ` Jerome Glisse
2017-06-15 3:15 ` John Hubbard
2017-06-15 1:46 ` Balbir Singh
2017-06-15 2:07 ` Jerome Glisse
2017-06-15 2:59 ` Balbir Singh
2017-06-14 21:20 ` [HMM-CDM 0/5] Cache coherent device memory (CDM) with HMM Dave Hansen
2017-06-14 21:38 ` Jerome Glisse
2017-06-14 21:58 ` Dave Hansen
2017-06-14 22:07 ` Benjamin Herrenschmidt [this message]
2017-06-14 23:40 ` Balbir Singh
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