From: Christoph Hellwig <hch@lst.de>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Luigi Rizzo <lrizzo@google.com>,
"David Hildenbrand (Arm)" <david@kernel.org>,
Luigi Rizzo <rizzo.unipi@gmail.com>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@kernel.org>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@kernel.org>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Danilo Krummrich <dakr@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Willem de Bruijn <willemb@google.com>,
Kuniyuki Iwashima <kuniyu@google.com>,
Joshua Washington <joshwash@google.com>,
Harshitha Ramamurthy <hramamurthy@google.com>,
Saeed Mahameed <saeedm@nvidia.com>,
Tariq Toukan <tariqt@nvidia.com>,
Tony Nguyen <anthony.l.nguyen@intel.com>,
Przemek Kitszel <przemyslaw.kitszel@intel.com>,
Alexander Lobakin <aleksander.lobakin@intel.com>,
Michael Chan <michael.chan@broadcom.com>,
Pavan Chebbi <pavan.chebbi@broadcom.com>,
iommu@lists.linux.dev, netdev@vger.kernel.org,
linux-mm@kvack.org, driver-core@lists.linux.dev,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC: DMA_PMD 00/22] DMA_PMD: PMD_SIZE-backed IO buffer pools
Date: Tue, 3 Nov 2026 09:09:33 +0100 [thread overview]
Message-ID: <20261103080933.GA4213@lst.de> (raw)
In-Reply-To: <20261023145023.GH3977851@ziepe.ca>
On Fri, Oct 23, 2026 at 11:50:23AM -0300, Jason Gunthorpe wrote:
> > Disk I/O is still potentially affected by the same problems
> > (cost if io mapping/unmapping, iotlb thrashing, bounce buffers
> > in confidential computing...)
>
> The disk folks already have a proposal to address all of this using
> io_uring and preallocated buffers. I really doubt yet another version
> is going to be interesting there.
Huh? If you mean the dma-buf I/O it doesn't really have anything
to do with disks, except that this is the first user. The dma-buf
iovec can work for every ->read_iter/->write_iter consumer, and
should be adopted more broadly. Including by networking instead of
their own totally weird different world.
next prev parent reply other threads:[~2026-11-03 8:09 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-03 21:22 [RFC: DMA_PMD 00/22] DMA_PMD: PMD_SIZE-backed IO buffer pools Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 01/22] iommu/dma: introduce CONFIG_DMA_PMD and metadata table Luigi Rizzo
2026-10-03 21:44 ` Randy Dunlap
2026-10-04 9:14 ` Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 02/22] iommu/dma: add DMA_PMD pool lifecycle and page recycle hook Luigi Rizzo
2026-10-10 2:59 ` kernel test robot
2026-10-03 21:22 ` [RFC: DMA_PMD 03/22] mm: Add split_page_compound() Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 04/22] iommu/dma: add DMA_PMD pool block allocation Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 05/22] iommu/dma: Global cap and shrinker for DMA_PMD pool memory Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 06/22] iommu/dma: reserve a per-domain IOVA window for DMA_PMD pages Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 07/22] iommu/dma: release DMA_PMD domain mappings on domain teardown Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 08/22] iommu/dma: use per-domain IOVA window to map DMA_PMD memory Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 09/22] iommu/dma: Add DMA_PMD arena allocator Luigi Rizzo
2026-10-08 11:25 ` kernel test robot
2026-10-03 21:22 ` [RFC: DMA_PMD 10/22] driver core: Add per-device dma_pmd_* sysfs attributes Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 11/22] dma-mapping: Use DMA_PMD arena for dma_alloc_attrs() Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 12/22] net/core: Use per-CPU DMA_PMD pools for skb_page_frag_refill() Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 13/22] net/core: Use DMA_PMD for page_pool memory Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 14/22] iommu/dma: Support decrypted and pinned DMA_PMD pages Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 15/22] iommu/dma: Add background page scrubber for DMA_PMD pools Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 16/22] iommu/dma: Add per-NUMA-node PMD page reservoir Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 17/22] net/gve: Use DMA_PMD memory for RX buffers Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 18/22] net/gve: Use DMA_PMD memory for tx header bounce buffers Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 19/22] net/mlx5e: " Luigi Rizzo
2026-10-14 17:22 ` Dragos Tatulea
2026-10-14 17:50 ` Dragos Tatulea
2026-10-14 18:28 ` Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 20/22] net/idpf: " Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 21/22] net/bnxt: " Luigi Rizzo
2026-10-03 21:22 ` [RFC: DMA_PMD 22/22] iommu/dma: Add DMA_PMD statistics and debugfs Luigi Rizzo
2026-10-11 9:02 ` [RFC: DMA_PMD 00/22] DMA_PMD: PMD_SIZE-backed IO buffer pools Pranjal Shrivastava
2026-10-12 13:51 ` David Hildenbrand (Arm)
2026-10-12 14:45 ` Luigi Rizzo
2026-10-12 19:43 ` David Hildenbrand (Arm)
2026-10-13 10:42 ` Robin Murphy
2026-10-14 10:47 ` David Hildenbrand (Arm)
2026-10-14 11:05 ` Luigi Rizzo
2026-10-17 17:11 ` Luigi Rizzo
2026-10-22 20:12 ` Jason Gunthorpe
2026-10-22 21:51 ` Luigi Rizzo
2026-10-23 14:01 ` Jason Gunthorpe
2026-10-23 14:30 ` Luigi Rizzo
2026-10-23 14:50 ` Jason Gunthorpe
2026-10-23 15:12 ` Luigi Rizzo
2026-10-23 17:27 ` Jakub Kicinski
2026-10-23 20:22 ` Luigi Rizzo
2026-11-03 8:09 ` Christoph Hellwig [this message]
2026-11-03 9:13 ` Luigi Rizzo
2026-11-03 15:10 ` Jason Gunthorpe
2026-10-12 14:49 ` Mostafa Saleh
2026-10-12 15:02 ` Luigi Rizzo
2026-10-14 17:28 ` Dragos Tatulea
2026-10-14 18:14 ` Luigi Rizzo
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