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From: John Hubbard <jhubbard@nvidia.com>
To: Joel Fernandes <joelagnelf@nvidia.com>
Cc: Eliot Courtney <ecourtney@nvidia.com>,
	linux-kernel@vger.kernel.org, Miguel Ojeda <ojeda@kernel.org>,
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	linux-fbdev@vger.kernel.org
Subject: Re: [PATCH v10 12/21] gpu: nova-core: mm: Add unified page table entry wrapper enums
Date: Thu, 9 Apr 2026 11:02:47 -0700	[thread overview]
Message-ID: <387064d2-8c6b-4b26-93e3-cab88d41dca3@nvidia.com> (raw)
In-Reply-To: <1775730646.3752.4760@nvidia.com>

On 4/9/26 3:33 AM, Joel Fernandes wrote:
...
> Since it is 3 against 1 here, I rest my case :-). I am still in

As Danilo points out, we want to foster healthy debate and land
on whatever comes out of that. Not just by counting noses. :)

> disagreement since I do not see much benefit (that is why I said
> pointless above). Actually it is not even about readability, that is
> subjective (and I haven’t heard most people say parametrizing code for
> the sake of it makes it more readable anyway). It is that the code gen
> is worse, and the complexity is just moved to a higher level in the
> code, not removed. So what are we getting out of this really, other than
> more boiler plate in higher layers of the code that did not exist
> before? Not performance, not better generated code. Really nothing. See
> all the data points in my previous reply.

Alex's latest response[1] does a *much* better job than mine, in
explicitly highlighting what we get out of this. (It arrived a bit after
your response here.) Please take a very close look at that response and
see what you think.

The patterns in these page tables are not a new thing, and Rust has
language features to help express them. 

[1] https://lore.kernel.org/DHOKJ3MJNO5P.SXKOAYKX13JL@nvidia.com

thanks,
-- 
John Hubbard


  parent reply	other threads:[~2026-04-10  7:07 UTC|newest]

Thread overview: 136+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-11  0:39 [PATCH v9 00/23] gpu: nova-core: Add memory management support Joel Fernandes
2026-03-11  0:39 ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 01/23] gpu: nova-core: Select GPU_BUDDY for VRAM allocation Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-12  6:34   ` Eliot Courtney
2026-03-12  6:34     ` Eliot Courtney
2026-03-16 13:17   ` Alexandre Courbot
2026-03-16 13:17     ` Alexandre Courbot
2026-03-16 16:28     ` Joel Fernandes
2026-03-16 16:28       ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 02/23] gpu: nova-core: Kconfig: Sort select statements alphabetically Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-12  6:35   ` Eliot Courtney
2026-03-12  6:35     ` Eliot Courtney
2026-03-16 13:17   ` Alexandre Courbot
2026-03-16 13:17     ` Alexandre Courbot
2026-03-16 16:28     ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 03/23] gpu: nova-core: gsp: Return GspStaticInfo from boot() Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-12  6:37   ` Eliot Courtney
2026-03-12  6:37     ` Eliot Courtney
2026-03-11  0:39 ` [PATCH v9 04/23] gpu: nova-core: gsp: Extract usable FB region from GSP Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-13  6:58   ` Eliot Courtney
2026-03-13  6:58     ` Eliot Courtney
2026-04-01 23:23     ` Joel Fernandes
2026-04-01 23:23       ` Joel Fernandes
2026-03-16 13:18   ` Alexandre Courbot
2026-03-16 13:18     ` Alexandre Courbot
2026-03-16 16:57     ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 05/23] gpu: nova-core: gsp: Expose total physical VRAM end from FB region info Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-16 13:19   ` Alexandre Courbot
2026-03-16 13:19     ` Alexandre Courbot
2026-03-16 17:00     ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 06/23] gpu: nova-core: mm: Add support to use PRAMIN windows to write to VRAM Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 07/23] docs: gpu: nova-core: Document the PRAMIN aperture mechanism Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 08/23] gpu: nova-core: mm: Add common memory management types Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 09/23] gpu: nova-core: mm: Add TLB flush support Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 10/23] gpu: nova-core: mm: Add GpuMm centralized memory manager Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 11/23] gpu: nova-core: mm: Add common types for all page table formats Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 12/23] gpu: nova-core: mm: Add MMU v2 page table types Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 13/23] gpu: nova-core: mm: Add MMU v3 " Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-11  0:39 ` [PATCH v9 14/23] gpu: nova-core: mm: Add unified page table entry wrapper enums Joel Fernandes
2026-03-11  0:39   ` Joel Fernandes
2026-03-11  0:40 ` [PATCH v9 15/23] gpu: nova-core: mm: Add page table walker for MMU v2/v3 Joel Fernandes
2026-03-11  0:40   ` Joel Fernandes
2026-03-11  0:40 ` [PATCH v9 16/23] gpu: nova-core: mm: Add Virtual Memory Manager Joel Fernandes
2026-03-11  0:40   ` Joel Fernandes
2026-03-11  0:40 ` [PATCH v9 17/23] gpu: nova-core: mm: Add virtual address range tracking to VMM Joel Fernandes
2026-03-11  0:40   ` Joel Fernandes
2026-03-11  0:40 ` [PATCH v9 18/23] gpu: nova-core: mm: Add multi-page mapping API " Joel Fernandes
2026-03-11  0:40   ` Joel Fernandes
2026-03-11  0:40 ` [PATCH v9 19/23] gpu: nova-core: Add BAR1 aperture type and size constant Joel Fernandes
2026-03-11  0:40   ` Joel Fernandes
2026-03-11  0:40 ` [PATCH v9 20/23] gpu: nova-core: mm: Add BAR1 user interface Joel Fernandes
2026-03-11  0:40   ` Joel Fernandes
2026-03-11  0:40 ` [PATCH v9 21/23] gpu: nova-core: mm: Add BAR1 memory management self-tests Joel Fernandes
2026-03-11  0:40   ` Joel Fernandes
2026-03-11  0:40 ` [PATCH v9 22/23] gpu: nova-core: mm: Add PRAMIN aperture self-tests Joel Fernandes
2026-03-11  0:40   ` Joel Fernandes
2026-03-11  0:40 ` [PATCH v9 23/23] gpu: nova-core: Use runtime BAR1 size instead of hardcoded 256MB Joel Fernandes
2026-03-11  0:40   ` Joel Fernandes
2026-03-11  0:58 ` ✗ Fi.CI.BUILD: failure for gpu: nova-core: Add memory management support (rev2) Patchwork
2026-03-31 21:20 ` [PATCH v10 00/21] gpu: nova-core: Add memory management support Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 01/21] gpu: nova-core: gsp: Return GspStaticInfo from boot() Joel Fernandes
2026-04-01  8:25     ` Eliot Courtney
2026-04-08  7:34     ` Alexandre Courbot
2026-03-31 21:20   ` [PATCH v10 02/21] gpu: nova-core: gsp: Extract usable FB region from GSP Joel Fernandes
2026-04-01  8:27     ` Eliot Courtney
2026-04-01 23:24       ` Joel Fernandes
2026-04-02  5:49         ` Eliot Courtney
2026-04-06 18:56           ` Joel Fernandes
2026-04-08  7:33     ` Alexandre Courbot
2026-03-31 21:20   ` [PATCH v10 03/21] gpu: nova-core: gsp: Expose total physical VRAM end from FB region info Joel Fernandes
2026-04-02  5:37     ` Eliot Courtney
2026-04-06 19:42       ` Joel Fernandes
2026-04-06 21:08       ` Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 04/21] gpu: nova-core: mm: Add support to use PRAMIN windows to write to VRAM Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 05/21] docs: gpu: nova-core: Document the PRAMIN aperture mechanism Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 06/21] gpu: nova-core: mm: Add common memory management types Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 07/21] gpu: nova-core: mm: Add TLB flush support Joel Fernandes
2026-04-02  5:49     ` Eliot Courtney
2026-04-06 20:50       ` Joel Fernandes
2026-04-02  5:59     ` Matthew Brost
2026-04-06 21:24       ` Joel Fernandes
2026-04-06 22:10         ` Joel Fernandes
2026-04-07  5:14           ` Matthew Brost
2026-04-08  7:40             ` Alexandre Courbot
2026-03-31 21:20   ` [PATCH v10 08/21] gpu: nova-core: mm: Add GpuMm centralized memory manager Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 09/21] gpu: nova-core: mm: Add common types for all page table formats Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 10/21] gpu: nova-core: mm: Add MMU v2 page table types Joel Fernandes
2026-04-02  5:41     ` Eliot Courtney
2026-04-06 21:14       ` Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 11/21] gpu: nova-core: mm: Add MMU v3 " Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 12/21] gpu: nova-core: mm: Add unified page table entry wrapper enums Joel Fernandes
2026-04-02  5:40     ` Eliot Courtney
2026-04-06 21:55       ` Joel Fernandes
2026-04-07 13:42         ` Eliot Courtney
2026-04-07 13:59           ` Joel Fernandes
2026-04-08  7:03             ` Alexandre Courbot
2026-04-08 20:19               ` Joel Fernandes
2026-04-09 10:56                 ` Alexandre Courbot
2026-04-13 20:04                   ` Joel Fernandes
2026-04-09 11:02                 ` Gary Guo
2026-04-13 20:25                   ` Joel Fernandes
2026-04-08 13:26             ` Eliot Courtney
2026-04-08 16:58               ` Joel Fernandes
2026-04-08 18:01                 ` Danilo Krummrich
2026-04-08 19:04                   ` Joel Fernandes
2026-04-08 23:13                 ` John Hubbard
2026-04-09 10:33                   ` Joel Fernandes
2026-04-09 11:00                     ` Danilo Krummrich
2026-04-13 20:10                       ` Joel Fernandes
2026-04-13 22:27                         ` Joel Fernandes
2026-04-13 22:50                           ` John Hubbard
2026-04-09 18:02                     ` John Hubbard [this message]
2026-03-31 21:20   ` [PATCH v10 13/21] gpu: nova-core: mm: Add page table walker for MMU v2/v3 Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 14/21] gpu: nova-core: mm: Add Virtual Memory Manager Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 15/21] gpu: nova-core: mm: Add virtual address range tracking to VMM Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 16/21] gpu: nova-core: mm: Add multi-page mapping API " Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 17/21] gpu: nova-core: Add BAR1 aperture type and size constant Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 18/21] gpu: nova-core: mm: Add BAR1 user interface Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 19/21] gpu: nova-core: mm: Add BAR1 memory management self-tests Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 20/21] gpu: nova-core: mm: Add PRAMIN aperture self-tests Joel Fernandes
2026-03-31 21:20   ` [PATCH v10 21/21] gpu: nova-core: Use runtime BAR1 size instead of hardcoded 256MB Joel Fernandes
2026-04-02  5:54     ` Eliot Courtney
2026-04-15 20:23       ` Joel Fernandes

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