From: Jerome Glisse <jglisse@redhat.com>
To: Balbir Singh <bsingharora@gmail.com>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Dan Williams <dan.j.williams@intel.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
John Hubbard <jhubbard@nvidia.com>,
Evgeny Baskakov <ebaskakov@nvidia.com>,
Mark Hairgrove <mhairgrove@nvidia.com>,
Sherry Cheung <SCheung@nvidia.com>,
Subhash Gutti <sgutti@nvidia.com>
Subject: Re: [HMM 12/15] mm/migrate: new memory migration helper for use with device memory v4
Date: Thu, 1 Jun 2017 18:35:18 -0400 [thread overview]
Message-ID: <20170601223518.GA2780@redhat.com> (raw)
In-Reply-To: <20170531135954.1d67ca31@firefly.ozlabs.ibm.com>
On Wed, May 31, 2017 at 01:59:54PM +1000, Balbir Singh wrote:
> On Wed, 24 May 2017 13:20:21 -0400
> Jérôme Glisse <jglisse@redhat.com> wrote:
>
> > This patch add a new memory migration helpers, which migrate memory
> > backing a range of virtual address of a process to different memory
> > (which can be allocated through special allocator). It differs from
> > numa migration by working on a range of virtual address and thus by
> > doing migration in chunk that can be large enough to use DMA engine
> > or special copy offloading engine.
> >
> > Expected users are any one with heterogeneous memory where different
> > memory have different characteristics (latency, bandwidth, ...). As
> > an example IBM platform with CAPI bus can make use of this feature
> > to migrate between regular memory and CAPI device memory. New CPU
> > architecture with a pool of high performance memory not manage as
> > cache but presented as regular memory (while being faster and with
> > lower latency than DDR) will also be prime user of this patch.
> >
> > Migration to private device memory will be useful for device that
> > have large pool of such like GPU, NVidia plans to use HMM for that.
> >
>
> It is helpful, for HMM-CDM however we would like to avoid the downsides
> of MIGRATE_SYNC_NOCOPY
What are the downside you are referring too ?
Cheers,
Jérôme
next prev parent reply other threads:[~2017-06-01 22:35 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-24 17:20 [HMM 00/15] HMM (Heterogeneous Memory Management) v23 Jérôme Glisse
2017-05-24 17:20 ` [HMM 01/15] hmm: heterogeneous memory management documentation Jérôme Glisse
2017-06-24 6:15 ` John Hubbard
2017-05-24 17:20 ` [HMM 02/15] mm/hmm: heterogeneous memory management (HMM for short) v4 Jérôme Glisse
2017-05-31 2:10 ` Balbir Singh
2017-06-01 22:35 ` Jerome Glisse
2017-05-24 17:20 ` [HMM 03/15] mm/hmm/mirror: mirror process address space on device with HMM helpers v3 Jérôme Glisse
2017-05-24 17:20 ` [HMM 04/15] mm/hmm/mirror: helper to snapshot CPU page table v3 Jérôme Glisse
2017-05-24 17:20 ` [HMM 05/15] mm/hmm/mirror: device page fault handler Jérôme Glisse
2017-05-24 17:20 ` [HMM 06/15] mm/memory_hotplug: introduce add_pages Jérôme Glisse
2017-05-31 1:31 ` Balbir Singh
2017-05-24 17:20 ` [HMM 07/15] mm/ZONE_DEVICE: new type of ZONE_DEVICE for unaddressable memory v3 Jérôme Glisse
2017-05-30 16:43 ` Ross Zwisler
2017-05-30 21:43 ` Jerome Glisse
2017-05-31 1:23 ` Balbir Singh
2017-06-09 3:55 ` John Hubbard
2017-06-12 17:57 ` Jerome Glisse
2017-06-15 3:41 ` zhong jiang
2017-06-15 17:43 ` Jerome Glisse
2017-05-24 17:20 ` [HMM 08/15] mm/ZONE_DEVICE: special case put_page() for device private pages v2 Jérôme Glisse
2017-05-24 17:20 ` [HMM 09/15] mm/hmm/devmem: device memory hotplug using ZONE_DEVICE v5 Jérôme Glisse
2017-06-24 3:54 ` John Hubbard
2017-05-24 17:20 ` [HMM 10/15] mm/hmm/devmem: dummy HMM device for ZONE_DEVICE memory v3 Jérôme Glisse
2017-05-24 17:20 ` [HMM 11/15] mm/migrate: new migrate mode MIGRATE_SYNC_NO_COPY Jérôme Glisse
2017-05-24 17:20 ` [HMM 12/15] mm/migrate: new memory migration helper for use with device memory v4 Jérôme Glisse
2017-05-31 3:59 ` Balbir Singh
2017-06-01 22:35 ` Jerome Glisse [this message]
2017-06-07 9:02 ` Balbir Singh
2017-06-07 14:06 ` Jerome Glisse
2017-05-24 17:20 ` [HMM 13/15] mm/migrate: migrate_vma() unmap page from vma while collecting pages Jérôme Glisse
2017-05-24 17:20 ` [HMM 14/15] mm/migrate: support un-addressable ZONE_DEVICE page in migration v2 Jérôme Glisse
2017-05-31 4:09 ` Balbir Singh
2017-05-31 8:39 ` Balbir Singh
2017-05-24 17:20 ` [HMM 15/15] mm/migrate: allow migrate_vma() to alloc new page on empty entry v2 Jérôme Glisse
2017-06-16 7:22 ` [HMM 00/15] HMM (Heterogeneous Memory Management) v23 Bridgman, John
2017-06-16 14:47 ` Jerome Glisse
2017-06-16 17:55 ` Bridgman, John
2017-06-16 18:04 ` Jerome Glisse
2017-06-23 15:00 ` Bob Liu
2017-06-23 15:28 ` Jerome Glisse
-- strict thread matches above, loose matches on Subject: below --
2017-05-22 16:51 [HMM 00/15] HMM (Heterogeneous Memory Management) v22 Jérôme Glisse
2017-05-22 16:52 ` [HMM 12/15] mm/migrate: new memory migration helper for use with device memory v4 Jérôme Glisse
2017-05-23 18:07 ` Reza Arbab
2017-06-27 0:07 ` Evgeny Baskakov
2017-06-30 23:19 ` Evgeny Baskakov
2017-07-01 0:57 ` Jerome Glisse
2017-07-01 2:06 ` Evgeny Baskakov
2017-07-10 22:59 ` Evgeny Baskakov
2017-07-10 23:43 ` Jerome Glisse
2017-07-11 0:17 ` Evgeny Baskakov
2017-07-11 0:54 ` Jerome Glisse
2017-07-20 21:05 ` Evgeny Baskakov
2017-07-10 23:44 ` Evgeny Baskakov
2017-07-11 18:29 ` Jerome Glisse
2017-07-11 18:42 ` Evgeny Baskakov
2017-07-11 18:49 ` Jerome Glisse
2017-07-11 19:35 ` Evgeny Baskakov
2017-07-13 20:16 ` Jerome Glisse
2017-07-14 5:32 ` Evgeny Baskakov
2017-07-14 19:43 ` Evgeny Baskakov
2017-07-15 0:55 ` Jerome Glisse
2017-07-15 5:04 ` Evgeny Baskakov
2017-07-21 1:00 ` Evgeny Baskakov
2017-07-21 1:33 ` Jerome Glisse
2017-07-21 22:01 ` Evgeny Baskakov
2017-07-25 22:45 ` Evgeny Baskakov
2017-07-26 19:14 ` Jerome Glisse
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