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From: John Hubbard <jhubbard@nvidia.com>
To: Alistair Popple <apopple@nvidia.com>,
	Linux MM <linux-mm@kvack.org>,
	Nouveau Dev <nouveau@lists.freedesktop.org>,
	Ben Skeggs <bskeggs@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	kvm-ppc@vger.kernel.org,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Ralph Campbell <rcampbell@nvidia.com>,
	Jerome Glisse <jglisse@redhat.com>,
	Jason Gunthorpe <jgg@ziepe.ca>
Subject: Re: [PATCH 0/9] Add support for SVM atomics in Nouveau
Date: Thu, 11 Feb 2021 02:26:15 +0000	[thread overview]
Message-ID: <2906f445-babb-5f4e-2d99-dc004ae1face@nvidia.com> (raw)
In-Reply-To: <YCPYtNeYCuu6i2/d@phenom.ffwll.local>

On 2/10/21 4:59 AM, Daniel Vetter wrote:
...
>> GPU atomic operations to sysmem are hard to categorize, because because application
>> programmers could easily write programs that do a long series of atomic operations.
>> Such a program would be a little weird, but it's hard to rule out.
> 
> Yeah, but we can forcefully break this whenever we feel like by revoking
> the page, moving it, and then reinstating the gpu pte again and let it
> continue.

Oh yes, that's true.

> 
> If that's no possible then what we need here instead is an mlock() type of
> thing I think.
No need for that, then.


thanks,
-- 
John Hubbard
NVIDIA

WARNING: multiple messages have this Message-ID (diff)
From: John Hubbard <jhubbard@nvidia.com>
To: Alistair Popple <apopple@nvidia.com>,
	Linux MM <linux-mm@kvack.org>,
	Nouveau Dev <nouveau@lists.freedesktop.org>,
	Ben Skeggs <bskeggs@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	<kvm-ppc@vger.kernel.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Ralph Campbell <rcampbell@nvidia.com>,
	Jerome Glisse <jglisse@redhat.com>,
	Jason Gunthorpe <jgg@ziepe.ca>
Subject: Re: [PATCH 0/9] Add support for SVM atomics in Nouveau
Date: Wed, 10 Feb 2021 18:26:15 -0800	[thread overview]
Message-ID: <2906f445-babb-5f4e-2d99-dc004ae1face@nvidia.com> (raw)
In-Reply-To: <YCPYtNeYCuu6i2/d@phenom.ffwll.local>

On 2/10/21 4:59 AM, Daniel Vetter wrote:
...
>> GPU atomic operations to sysmem are hard to categorize, because because application
>> programmers could easily write programs that do a long series of atomic operations.
>> Such a program would be a little weird, but it's hard to rule out.
> 
> Yeah, but we can forcefully break this whenever we feel like by revoking
> the page, moving it, and then reinstating the gpu pte again and let it
> continue.

Oh yes, that's true.

> 
> If that's no possible then what we need here instead is an mlock() type of
> thing I think.
No need for that, then.


thanks,
-- 
John Hubbard
NVIDIA

WARNING: multiple messages have this Message-ID (diff)
From: John Hubbard <jhubbard@nvidia.com>
To: Alistair Popple <apopple@nvidia.com>,
	Linux MM <linux-mm@kvack.org>,
	Nouveau Dev <nouveau@lists.freedesktop.org>,
	Ben Skeggs <bskeggs@redhat.com>,
	 Andrew Morton <akpm@linux-foundation.org>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	<kvm-ppc@vger.kernel.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Ralph Campbell <rcampbell@nvidia.com>,
	Jerome Glisse <jglisse@redhat.com>,
	Jason Gunthorpe <jgg@ziepe.ca>
Subject: Re: [Nouveau] [PATCH 0/9] Add support for SVM atomics in Nouveau
Date: Wed, 10 Feb 2021 18:26:15 -0800	[thread overview]
Message-ID: <2906f445-babb-5f4e-2d99-dc004ae1face@nvidia.com> (raw)
In-Reply-To: <YCPYtNeYCuu6i2/d@phenom.ffwll.local>

On 2/10/21 4:59 AM, Daniel Vetter wrote:
...
>> GPU atomic operations to sysmem are hard to categorize, because because application
>> programmers could easily write programs that do a long series of atomic operations.
>> Such a program would be a little weird, but it's hard to rule out.
> 
> Yeah, but we can forcefully break this whenever we feel like by revoking
> the page, moving it, and then reinstating the gpu pte again and let it
> continue.

Oh yes, that's true.

> 
> If that's no possible then what we need here instead is an mlock() type of
> thing I think.
No need for that, then.


thanks,
-- 
John Hubbard
NVIDIA
_______________________________________________
Nouveau mailing list
Nouveau@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/nouveau

WARNING: multiple messages have this Message-ID (diff)
From: John Hubbard <jhubbard@nvidia.com>
To: Alistair Popple <apopple@nvidia.com>,
	Linux MM <linux-mm@kvack.org>,
	Nouveau Dev <nouveau@lists.freedesktop.org>,
	Ben Skeggs <bskeggs@redhat.com>,
	 Andrew Morton <akpm@linux-foundation.org>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	<kvm-ppc@vger.kernel.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Ralph Campbell <rcampbell@nvidia.com>,
	Jerome Glisse <jglisse@redhat.com>,
	Jason Gunthorpe <jgg@ziepe.ca>
Subject: Re: [PATCH 0/9] Add support for SVM atomics in Nouveau
Date: Wed, 10 Feb 2021 18:26:15 -0800	[thread overview]
Message-ID: <2906f445-babb-5f4e-2d99-dc004ae1face@nvidia.com> (raw)
In-Reply-To: <YCPYtNeYCuu6i2/d@phenom.ffwll.local>

On 2/10/21 4:59 AM, Daniel Vetter wrote:
...
>> GPU atomic operations to sysmem are hard to categorize, because because application
>> programmers could easily write programs that do a long series of atomic operations.
>> Such a program would be a little weird, but it's hard to rule out.
> 
> Yeah, but we can forcefully break this whenever we feel like by revoking
> the page, moving it, and then reinstating the gpu pte again and let it
> continue.

Oh yes, that's true.

> 
> If that's no possible then what we need here instead is an mlock() type of
> thing I think.
No need for that, then.


thanks,
-- 
John Hubbard
NVIDIA
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  reply	other threads:[~2021-02-11  2:26 UTC|newest]

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-09  1:07 [PATCH 0/9] Add support for SVM atomics in Nouveau Alistair Popple
2021-02-09  1:07 ` Alistair Popple
2021-02-09  1:07 ` [Nouveau] " Alistair Popple
2021-02-09  1:07 ` Alistair Popple
2021-02-09  1:07 ` [PATCH 1/9] mm/migrate.c: Always allow device private pages to migrate Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07   ` [Nouveau] " Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09 13:39   ` Jason Gunthorpe
2021-02-09 13:39     ` Jason Gunthorpe
2021-02-09 13:39     ` [Nouveau] " Jason Gunthorpe
2021-02-09 13:39     ` Jason Gunthorpe
2021-02-10  3:40     ` Alistair Popple
2021-02-10  3:40       ` Alistair Popple
2021-02-10  3:40       ` [Nouveau] " Alistair Popple
2021-02-10  3:40       ` Alistair Popple
2021-02-10 12:56       ` Jason Gunthorpe
2021-02-10 12:56         ` Jason Gunthorpe
2021-02-10 12:56         ` [Nouveau] " Jason Gunthorpe
2021-02-10 12:56         ` Jason Gunthorpe
2021-02-09  1:07 ` [PATCH 2/9] mm/migrate.c: Allow pfn flags to be passed to migrate_vma_setup() Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07   ` [Nouveau] " Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07 ` [PATCH 3/9] mm/migrate: Add a unmap and pin migration mode Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07   ` [Nouveau] " Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07 ` [PATCH 4/9] Documentation: Add unmap and pin to HMM Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07   ` [Nouveau] " Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07 ` [PATCH 5/9] hmm-tests: Add test for unmap and pin Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07   ` [Nouveau] " Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07 ` [PATCH 6/9] nouveau/dmem: Only map migrating pages Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07   ` [Nouveau] " Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07 ` [PATCH 7/9] nouveau/svm: Refactor nouveau_range_fault Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07   ` [Nouveau] " Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07 ` [PATCH 8/9] nouveau/dmem: Add support for multiple page types Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07   ` [Nouveau] " Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07 ` [PATCH 9/9] nouveau/svm: Implement atomic SVM access Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09  1:07   ` [Nouveau] " Alistair Popple
2021-02-09  1:07   ` Alistair Popple
2021-02-09 10:27 ` [PATCH 0/9] Add support for SVM atomics in Nouveau Daniel Vetter
2021-02-09 10:27   ` Daniel Vetter
2021-02-09 10:27   ` [Nouveau] " Daniel Vetter
2021-02-09 10:27   ` Daniel Vetter
2021-02-09 12:57   ` Alistair Popple
2021-02-09 12:57     ` Alistair Popple
2021-02-09 12:57     ` [Nouveau] " Alistair Popple
2021-02-09 12:57     ` Alistair Popple
2021-02-09 13:35     ` Jason Gunthorpe
2021-02-09 13:35       ` Jason Gunthorpe
2021-02-09 13:35       ` [Nouveau] " Jason Gunthorpe
2021-02-09 13:35       ` Jason Gunthorpe
2021-02-09 13:39       ` Daniel Vetter
2021-02-09 13:39         ` Daniel Vetter
2021-02-09 13:39         ` [Nouveau] " Daniel Vetter
2021-02-09 13:39         ` Daniel Vetter
2021-02-09 13:44         ` Jason Gunthorpe
2021-02-09 13:44           ` Jason Gunthorpe
2021-02-09 13:44           ` [Nouveau] " Jason Gunthorpe
2021-02-09 13:44           ` Jason Gunthorpe
2021-02-09 21:17       ` Jerome Glisse
2021-02-09 21:17         ` Jerome Glisse
2021-02-09 21:17         ` [Nouveau] " Jerome Glisse
2021-02-09 21:17         ` Jerome Glisse
2021-02-10 17:56         ` Jason Gunthorpe
2021-02-10 17:56           ` Jason Gunthorpe
2021-02-10 17:56           ` [Nouveau] " Jason Gunthorpe
2021-02-10 17:56           ` Jason Gunthorpe
2021-02-09 13:37     ` Daniel Vetter
2021-02-09 13:37       ` Daniel Vetter
2021-02-09 13:37       ` [Nouveau] " Daniel Vetter
2021-02-09 13:37       ` Daniel Vetter
2021-02-09 20:53       ` John Hubbard
2021-02-09 20:53         ` John Hubbard
2021-02-09 20:53         ` [Nouveau] " John Hubbard
2021-02-09 20:53         ` John Hubbard
2021-02-10 12:59         ` Daniel Vetter
2021-02-10 12:59           ` Daniel Vetter
2021-02-10 12:59           ` [Nouveau] " Daniel Vetter
2021-02-10 12:59           ` Daniel Vetter
2021-02-11  2:26           ` John Hubbard [this message]
2021-02-11  2:26             ` John Hubbard
2021-02-11  2:26             ` [Nouveau] " John Hubbard
2021-02-11  2:26             ` John Hubbard
2021-02-10 17:59         ` Jason Gunthorpe
2021-02-10 17:59           ` Jason Gunthorpe
2021-02-10 17:59           ` [Nouveau] " Jason Gunthorpe
2021-02-10 17:59           ` Jason Gunthorpe
2021-02-11  7:55           ` Christoph Hellwig
2021-02-11  7:55             ` [Nouveau] " Christoph Hellwig
2021-02-17 23:00             ` Alistair Popple
2021-02-17 23:00               ` Alistair Popple
2021-02-17 23:00               ` [Nouveau] " Alistair Popple
2021-02-17 23:00               ` Alistair Popple

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