From: Isaac Manjarres <isaacmanjarres@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>, Christoph Hellwig <hch@lst.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Ard Biesheuvel <ardb@kernel.org>,
Saravana Kannan <saravanak@google.com>,
Alasdair Kergon <agk@redhat.com>, Daniel Vetter <daniel@ffwll.ch>,
Joerg Roedel <joro@8bytes.org>, Mark Brown <broonie@kernel.org>,
Mike Snitzer <snitzer@kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
linux-mm@kvack.org, iommu@lists.linux.dev,
linux-arm-kernel@lists.infradead.org,
Petr Tesarik <petrtesarik@huaweicloud.com>
Subject: Re: [PATCH v3 00/13] mm, dma, arm64: Reduce ARCH_KMALLOC_MINALIGN to 8
Date: Tue, 16 May 2023 11:19:22 -0700 [thread overview]
Message-ID: <ZGPJKq5ME2r6KIFt@google.com> (raw)
In-Reply-To: <ZGO7L9EyDEXU6zWf@arm.com>
On Tue, May 16, 2023 at 06:19:43PM +0100, Catalin Marinas wrote:
> On Mon, May 15, 2023 at 12:09:12PM -0700, Isaac Manjarres wrote:
> > Hey Catalin, just following up on this. I think it might be worthwhile
> > to split this series into two series:
> >
> > Series 1: Decouple ARCH_KMALLOC_MINALIGN from ARCH_DMA_MINALIGN,
> > and use the cacheline size to determine the minimum kmalloc
> > alignment.
> >
> > Series 2: Lower the minimum kmalloc alignment to 8 bytes by adding
> > support for using SWIOTLB to bounce unaligned kmalloc buffers for DMA
> > transactions.
>
> I attempted "series 1" some time ago and the discussion led to the
> combined approach (i.e. don't bother with limiting kmalloc minimum
> alignment to cache_line_size() but instead bounce those small buffers).
> In my series, I still have this fallback in case there's no swiotlb
> buffer.
> I'll post a new series this week (including DMA bouncing) but I'll try
> to move the bouncing towards the end of the series in case there are
> more discussions around this, at least the first part could be picked
> up.
Thanks Catalin! I think restructuring the series as you're suggesting
makes sense. At least being able to pick up the first part of the series
would be great, since it will have a positive impact on the memory
footprint for a lot of devices. This also helps alleviate some of the
memory overhead for devices that move from a 32-bit ARM kernel to a
64-bit ARM kernel.
The second part can continue to be refined until the SWIOTLB and IOMMU bounce
buffering refactor is complete.
-Isaac
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prev parent reply other threads:[~2023-05-16 18:19 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-06 22:01 [PATCH v3 00/13] mm, dma, arm64: Reduce ARCH_KMALLOC_MINALIGN to 8 Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 01/13] mm/slab: Decouple ARCH_KMALLOC_MINALIGN from ARCH_DMA_MINALIGN Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 02/13] dma-mapping: Force bouncing if the kmalloc() size is not cacheline-aligned Catalin Marinas
2022-11-07 9:43 ` Christoph Hellwig
2022-11-06 22:01 ` [PATCH v3 03/13] iommu/dma: Force bouncing of the " Catalin Marinas
2022-11-07 9:46 ` Christoph Hellwig
2022-11-07 10:54 ` Catalin Marinas
2022-11-07 13:26 ` Robin Murphy
2022-11-08 10:51 ` Catalin Marinas
2022-11-08 11:40 ` Robin Murphy
2022-11-08 7:50 ` Christoph Hellwig
2022-11-14 23:23 ` Isaac Manjarres
2022-11-15 11:48 ` Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 04/13] mm/slab: Allow kmalloc() minimum alignment fallback to dma_get_cache_alignment() Catalin Marinas
[not found] ` <202211070812.BhGKB0Hd-lkp@intel.com>
2022-11-07 9:22 ` Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 05/13] mm/slab: Simplify create_kmalloc_cache() args and make it static Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 06/13] dma: Allow the smaller cache_line_size() returned by dma_get_cache_alignment() Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 07/13] drivers/base: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 08/13] drivers/gpu: " Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 09/13] drivers/usb: " Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 10/13] drivers/spi: " Catalin Marinas
2022-11-07 12:58 ` Mark Brown
2022-11-06 22:01 ` [PATCH v3 11/13] crypto: " Catalin Marinas
2022-11-07 2:22 ` Herbert Xu
2022-11-07 9:05 ` Catalin Marinas
2022-11-07 9:12 ` Herbert Xu
2022-11-07 9:38 ` Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 12/13] drivers/md: " Catalin Marinas
2022-11-06 22:01 ` [PATCH v3 13/13] dma: arm64: Add CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC and enable it for arm64 Catalin Marinas
2022-11-07 13:03 ` Robin Murphy
2022-11-07 14:38 ` Christoph Hellwig
2022-11-07 15:24 ` Robin Murphy
2022-11-08 9:52 ` Catalin Marinas
2022-11-08 10:03 ` Christoph Hellwig
2022-11-30 18:48 ` Isaac Manjarres
2022-11-30 23:32 ` Alexander Graf
2023-04-20 11:51 ` Petr Tesařík
2023-03-16 18:38 ` [PATCH v3 00/13] mm, dma, arm64: Reduce ARCH_KMALLOC_MINALIGN to 8 Isaac Manjarres
2023-04-19 16:06 ` Catalin Marinas
2023-04-20 9:52 ` Petr Tesarik
2023-04-20 17:43 ` Catalin Marinas
2023-05-15 19:09 ` Isaac Manjarres
2023-05-16 17:19 ` Catalin Marinas
2023-05-16 18:19 ` Isaac Manjarres [this message]
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