linux-kernel - Re: [PATCH v8 00/24] Provide a new two step DMA mapping API

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Message-ID: <93ef8629-4040-4773-beac-03c62f848727@kernel.dk>
Date: Fri, 18 Apr 2025 06:18:00 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Leon Romanovsky <leon@...nel.org>,
 Marek Szyprowski <m.szyprowski@...sung.com>, Christoph Hellwig <hch@....de>,
 Keith Busch <kbusch@...nel.org>
Cc: Jake Edge <jake@....net>, Jonathan Corbet <corbet@....net>,
 Jason Gunthorpe <jgg@...pe.ca>, Zhu Yanjun <zyjzyj2000@...il.com>,
 Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Sagi Grimberg <sagi@...mberg.me>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Logan Gunthorpe <logang@...tatee.com>,
 Yishai Hadas <yishaih@...dia.com>,
 Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
 Kevin Tian <kevin.tian@...el.com>,
 Alex Williamson <alex.williamson@...hat.com>,
 Jérôme Glisse <jglisse@...hat.com>,
 Andrew Morton <akpm@...ux-foundation.org>, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
 linux-rdma@...r.kernel.org, iommu@...ts.linux.dev,
 linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
 kvm@...r.kernel.org, linux-mm@...ck.org,
 Niklas Schnelle <schnelle@...ux.ibm.com>,
 Chuck Lever <chuck.lever@...cle.com>, Luis Chamberlain <mcgrof@...nel.org>,
 Matthew Wilcox <willy@...radead.org>, Dan Williams
 <dan.j.williams@...el.com>, Kanchan Joshi <joshi.k@...sung.com>,
 Chaitanya Kulkarni <kch@...dia.com>
Subject: Re: [PATCH v8 00/24] Provide a new two step DMA mapping API

On 4/18/25 12:47 AM, Leon Romanovsky wrote:
> Following recent on site LSF/MM 2025 [1] discussion, the overall
> response was extremely positive with many people expressed their
> desire to see this series merged, so they can base their work on it.
> 
> It includes, but not limited:
>  * Luis's "nvme-pci: breaking the 512 KiB max IO boundary":
>    https://lore.kernel.org/all/20250320111328.2841690-1-mcgrof@kernel.org/
>  * Chuck's NFS conversion to use one structure (bio_vec) for all types
>    of RPC transports:
>    https://lore.kernel.org/all/913df4b4-fc4a-409d-9007-088a3e2c8291@oracle.com
>  * Matthew's vision for the world without struct page:
>    https://lore.kernel.org/all/20250320111328.2841690-1-mcgrof@kernel.org/
>  * Confidential computing roadmap from Dan:
>    https://lore.kernel.org/all/6801a8e3968da_71fe29411@dwillia2-xfh.jf.intel.com.notmuch
> 
> This series is combination of effort of many people who contributed ideas,
> code and testing and I'm gratefully thankful for them.

Since I previously complained about performance regressions from this
series, I re-tested the current code. I no longer see a performance
regression on a AMD EPYC 9754 256 core box, nor on AMD EPYC 7763 128
core box.

Tested-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe