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From: Leon Romanovsky <leon@kernel.org>
To: Srinivasulu Thanneeru <dev.srinivasulu@gmail.com>
Cc: "Jens Axboe" <axboe@kernel.dk>, "Jason Gunthorpe" <jgg@ziepe.ca>,
	"Robin Murphy" <robin.murphy@arm.com>,
	"Joerg Roedel" <joro@8bytes.org>, "Will Deacon" <will@kernel.org>,
	"Christoph Hellwig" <hch@lst.de>,
	"Sagi Grimberg" <sagi@grimberg.me>,
	"Keith Busch" <kbusch@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Logan Gunthorpe" <logang@deltatee.com>,
	"Yishai Hadas" <yishaih@nvidia.com>,
	"Shameer Kolothum" <shameerali.kolothum.thodi@huawei.com>,
	"Kevin Tian" <kevin.tian@intel.com>,
	"Alex Williamson" <alex.williamson@redhat.com>,
	"Marek Szyprowski" <m.szyprowski@samsung.com>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Jonathan Corbet" <corbet@lwn.net>,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-block@vger.kernel.org, linux-rdma@vger.kernel.org,
	iommu@lists.linux.dev, linux-nvme@lists.infradead.org,
	linux-pci@vger.kernel.org, kvm@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: [PATCH 05/18] dma: Provide an interface to allow allocate IOVA
Date: Mon, 28 Oct 2024 08:46:34 +0200	[thread overview]
Message-ID: <20241028064634.GE1615717@unreal> (raw)
In-Reply-To: <CAMtOeKJeVrELCp5JpYTC64KdfKpbnW9a8QrnL6ziCYL48nc=qQ@mail.gmail.com>

On Mon, Oct 28, 2024 at 09:54:49AM +0530, Srinivasulu Thanneeru wrote:
> On Sun, Oct 27, 2024 at 10:23 PM Leon Romanovsky <leon@kernel.org> wrote:
> >
> > From: Leon Romanovsky <leonro@nvidia.com>
> >
> > The existing .map_page() callback provides both allocating of IOVA
> > and linking DMA pages. That combination works great for most of the
> > callers who use it in control paths, but is less effective in fast
> > paths where there may be multiple calls to map_page().
> 
> Can you please share perf stats with this patch in fast path, if available?

I don't have this data for HMM and VFIO as they have other benefits from this
series except performance. For NVMe, I don't have the data yet, but it will
come https://lore.kernel.org/all/cover.1730037261.git.leon@kernel.org/,
as it is the main performant user of this API.

This is the main reason why NVMe series is marked as RFC yet.

Thanks

  reply	other threads:[~2024-10-28  6:46 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-10-27 14:21 [PATCH 00/18] Provide a new two step DMA mapping API Leon Romanovsky
2024-10-27 14:21 ` [PATCH 01/18] PCI/P2PDMA: refactor the p2pdma mapping helpers Leon Romanovsky
2024-10-28 18:10   ` Logan Gunthorpe
2024-10-28 20:59   ` Bjorn Helgaas
2024-10-29 16:48     ` Leon Romanovsky
2024-10-27 14:21 ` [PATCH 02/18] dma-mapping: move the PCI P2PDMA mapping helpers to pci-p2pdma.h Leon Romanovsky
2024-10-28 18:11   ` Logan Gunthorpe
2024-10-29 15:11   ` Bjorn Helgaas
2024-10-27 14:21 ` [PATCH 03/18] iommu: generalize the batched sync after map interface Leon Romanovsky
2024-10-27 14:21 ` [PATCH 04/18] dma-mapping: Add check if IOVA can be used Leon Romanovsky
2024-10-27 14:21 ` [PATCH 05/18] dma: Provide an interface to allow allocate IOVA Leon Romanovsky
2024-10-28  1:24   ` Baolu Lu
2024-10-28  6:37     ` Leon Romanovsky
2024-10-29  7:46       ` Christoph Hellwig
2024-10-28  4:24   ` Srinivasulu Thanneeru
2024-10-28  6:46     ` Leon Romanovsky [this message]
2024-10-27 14:21 ` [PATCH 06/18] iommu/dma: Factor out a iommu_dma_map_swiotlb helper Leon Romanovsky
2024-10-27 14:21 ` [PATCH 07/18] dma-mapping: Implement link/unlink ranges API Leon Romanovsky
2024-10-28  2:00   ` Baolu Lu
2024-10-28  6:22     ` Leon Romanovsky
2024-10-28 18:31       ` Leon Romanovsky
2024-10-27 14:21 ` [PATCH 08/18] dma-mapping: add a dma_need_unmap helper Leon Romanovsky
2024-10-27 14:21 ` [PATCH 09/18] docs: core-api: document the IOVA-based API Leon Romanovsky
2024-10-28 18:12   ` Logan Gunthorpe
2024-10-28 18:28     ` Leon Romanovsky
2024-10-27 14:21 ` [PATCH 10/18] mm/hmm: let users to tag specific PFN with DMA mapped bit Leon Romanovsky
2024-10-27 14:21 ` [PATCH 11/18] mm/hmm: provide generic DMA managing logic Leon Romanovsky
2024-10-27 14:21 ` [PATCH 12/18] RDMA/umem: Store ODP access mask information in PFN Leon Romanovsky
2024-10-27 14:21 ` [PATCH 13/18] RDMA/core: Convert UMEM ODP DMA mapping to caching IOVA and page linkage Leon Romanovsky
2024-10-27 14:21 ` [PATCH 14/18] RDMA/umem: Separate implicit ODP initialization from explicit ODP Leon Romanovsky
2024-10-27 14:21 ` [PATCH 15/18] vfio/mlx5: Explicitly use number of pages instead of allocated length Leon Romanovsky
2024-10-27 14:21 ` [PATCH 16/18] vfio/mlx5: Rewrite create mkey flow to allow better code reuse Leon Romanovsky
2024-10-27 14:21 ` [PATCH 17/18] vfio/mlx5: Explicitly store page list Leon Romanovsky
2024-10-27 14:21 ` [PATCH 18/18] vfio/mlx5: Convert vfio to use DMA link API Leon Romanovsky

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