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From: Alexander Graf <agraf@csgraf.de>
To: Isaac Manjarres <isaacmanjarres@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Arnd Bergmann <arnd@arndb.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>,
	linux-mm@kvack.org, iommu@lists.linux.dev,
	linux-arm-kernel@lists.infradead.org,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3 13/13] dma: arm64: Add CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC and enable it for arm64
Date: Thu, 1 Dec 2022 00:32:07 +0100	[thread overview]
Message-ID: <629d62ce-b993-35fe-05ff-ee0befc0c73d@csgraf.de> (raw)
In-Reply-To: <Y4eldGXZjpi2L2SQ@google.com>

Hi Isaac,

On 30.11.22 19:48, Isaac Manjarres wrote:
> On Tue, Nov 08, 2022 at 11:03:31AM +0100, Christoph Hellwig wrote:
>> On Tue, Nov 08, 2022 at 09:52:15AM +0000, Catalin Marinas wrote:
>>> Since it's hard to guess the optimal swiotlb buffer for such platforms,
>>> I think a follow-up step would be to use the DMA coherent pool for
>>> bouncing if no swiotlb buffer is available. At least the pool can grow
>>> dynamically. Yet another option would be to increase the swiotlb buffer
>>> at run-time but it has an overhead for is_swiotlb_buffer().
>> Alex said he wanted to look into growing the swiotlb buffer on demand
>> for other reason, so adding him to Cc to check if there has been any
>> progress on that.
> Hi Alex,
>
> Did you get a chance to look into this? If so, have you been able to
> make progress on being able to grow the SWIOTLB buffer on demand?


I've been slightly under water and haven't been able to look at this yet 
:). It's on my list, but will probably be a while until I get to it. 
Would you be interested in having a first try?


Thanks,

Alex




  reply	other threads:[~2022-11-30 23:32 UTC|newest]

Thread overview: 46+ 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
2022-11-07  0:50   ` kernel test robot
2022-11-07  9:22     ` Catalin Marinas
2022-11-07  1:51   ` kernel test robot
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 [this message]
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

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