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From: Jason Gunthorpe <jgg@ziepe.ca>
To: Jerome Glisse <jglisse@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	Nouveau Dev <nouveau@lists.freedesktop.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Alistair Popple <apopple@nvidia.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	kvm-ppc@vger.kernel.org, Linux MM <linux-mm@kvack.org>,
	Ben Skeggs <bskeggs@redhat.com>, Daniel Vetter <daniel@ffwll.ch>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [Nouveau] [PATCH 0/9] Add support for SVM atomics in Nouveau
Date: Wed, 10 Feb 2021 13:56:26 -0400
Message-ID: <20210210175626.GN4718@ziepe.ca> (raw)
In-Reply-To: <20210209211738.GA834106@redhat.com>

On Tue, Feb 09, 2021 at 04:17:38PM -0500, Jerome Glisse wrote:

> > > Yes, I would like to avoid the long term pin constraints as well if possible I
> > > just haven't found a solution yet. Are you suggesting it might be possible to 
> > > add a callback in the page migration logic to specially deal with moving these 
> > > pages?
> > 
> > How would migration even find the page?
> 
> Migration can scan memory from physical address (isolate_migratepages_range())
> So the CPU mapping is not the only path to get to a page.

I mean find out that the page is now owned by the GPU driver to tell
it that it needs to migrate that reference. Normally that would go
through the VMA to the mmu notifier, but with the page removed from
the normal VMA it can't get to a mmu notifier or the GPU driver.

Jason
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Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-09  1:07 Alistair Popple
2021-02-09  1:07 ` [Nouveau] [PATCH 1/9] mm/migrate.c: Always allow device private pages to migrate Alistair Popple
2021-02-09 13:39   ` Jason Gunthorpe
2021-02-10  3:40     ` Alistair Popple
2021-02-10 12:56       ` Jason Gunthorpe
2021-02-09  1:07 ` [Nouveau] [PATCH 2/9] mm/migrate.c: Allow pfn flags to be passed to migrate_vma_setup() Alistair Popple
2021-02-09  1:07 ` [Nouveau] [PATCH 3/9] mm/migrate: Add a unmap and pin migration mode Alistair Popple
2021-02-09  1:07 ` [Nouveau] [PATCH 4/9] Documentation: Add unmap and pin to HMM Alistair Popple
2021-02-09  1:07 ` [Nouveau] [PATCH 5/9] hmm-tests: Add test for unmap and pin Alistair Popple
2021-02-09  1:07 ` [Nouveau] [PATCH 6/9] nouveau/dmem: Only map migrating pages Alistair Popple
2021-02-09  1:07 ` [Nouveau] [PATCH 7/9] nouveau/svm: Refactor nouveau_range_fault Alistair Popple
2021-02-09  1:07 ` [Nouveau] [PATCH 8/9] nouveau/dmem: Add support for multiple page types Alistair Popple
2021-02-09  1:07 ` [Nouveau] [PATCH 9/9] nouveau/svm: Implement atomic SVM access Alistair Popple
2021-02-09 10:27 ` [Nouveau] [PATCH 0/9] Add support for SVM atomics in Nouveau Daniel Vetter
2021-02-09 12:57   ` Alistair Popple
2021-02-09 13:35     ` Jason Gunthorpe
2021-02-09 13:39       ` Daniel Vetter
2021-02-09 13:44         ` Jason Gunthorpe
2021-02-09 21:17       ` Jerome Glisse
2021-02-10 17:56         ` Jason Gunthorpe [this message]
2021-02-09 13:37     ` Daniel Vetter
2021-02-09 20:53       ` John Hubbard
2021-02-10 12:59         ` Daniel Vetter
2021-02-11  2:26           ` John Hubbard
2021-02-10 17:59         ` Jason Gunthorpe
2021-02-11  7:55           ` Christoph Hellwig
2021-02-17 23:00             ` Alistair Popple

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