From: Logan Gunthorpe <logang@deltatee.com>
To: Leon Romanovsky <leon@kernel.org>, 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>
Cc: "Keith Busch" <kbusch@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.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: [RFC PATCH 2/7] block: don't merge different kinds of P2P transfers in a single bio
Date: Mon, 28 Oct 2024 12:27:51 -0600 [thread overview]
Message-ID: <9db04bd9-81e1-4e60-a590-0882cd86052f@deltatee.com> (raw)
In-Reply-To: <34d44537a65aba6ede215a8ad882aeee028b423a.1730037261.git.leon@kernel.org>
On 2024-10-27 08:21, Leon Romanovsky wrote:
> From: Christoph Hellwig <hch@lst.de>
>
> To get out of the dma mapping helpers having to check every segment for
> it's P2P status, ensure that bios either contain P2P transfers or non-P2P
> transfers, and that a P2P bio only contains ranges from a single device.
>
> This means we do the page zone access in the bio add path where it should
> be still page hot, and will only have do the fairly expensive P2P topology
> lookup once per bio down in the dma mapping path, and only for already
> marked bios.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Looks good to me.
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
next prev parent reply other threads:[~2024-10-28 18:28 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-27 14:21 [RFC PATCH 0/7] Block and NMMe PCI use of new DMA mapping API Leon Romanovsky
2024-10-27 14:21 ` [RFC PATCH 1/7] block: share more code for bio addition helpers Leon Romanovsky
2024-10-31 20:55 ` Bart Van Assche
2024-11-04 8:55 ` Christoph Hellwig
2024-10-27 14:21 ` [RFC PATCH 2/7] block: don't merge different kinds of P2P transfers in a single bio Leon Romanovsky
2024-10-28 18:27 ` Logan Gunthorpe [this message]
2024-10-31 20:58 ` Bart Van Assche
2024-11-01 6:11 ` Leon Romanovsky
2024-11-04 8:55 ` Christoph Hellwig
2024-11-02 7:39 ` Zhu Yanjun
2024-11-03 15:19 ` Leon Romanovsky
2024-11-04 8:56 ` Christoph Hellwig
2024-10-27 14:21 ` [RFC PATCH 3/7] blk-mq: add a dma mapping iterator Leon Romanovsky
2024-10-27 14:21 ` [RFC PATCH 4/7] blk-mq: add scatterlist-less DMA mapping helpers Leon Romanovsky
2024-10-27 14:21 ` [RFC PATCH 5/7] nvme-pci: remove struct nvme_descriptor Leon Romanovsky
2024-10-27 14:21 ` [RFC PATCH 6/7] nvme-pci: use a better encoding for small prp pool allocations Leon Romanovsky
2024-10-27 14:22 ` [RFC PATCH 7/7] nvme-pci: convert to blk_rq_dma_map Leon Romanovsky
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