linux-kernel - Re: [PATCH v1 00/17] Provide a new two step DMA mapping API

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Message-ID: <3144b6e7-5c80-46d2-8ddc-a71af3c23072@kernel.dk>
Date: Wed, 30 Oct 2024 19:44:13 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Leon Romanovsky <leon@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>,
 Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Christoph Hellwig <hch@....de>,
 Sagi Grimberg <sagi@...mberg.me>
Cc: Keith Busch <kbusch@...nel.org>, 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>,
 Marek Szyprowski <m.szyprowski@...sung.com>,
 Jérôme Glisse <jglisse@...hat.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Jonathan Corbet <corbet@....net>,
 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
Subject: Re: [PATCH v1 00/17] Provide a new two step DMA mapping API

On 10/30/24 9:12 AM, Leon Romanovsky wrote:
> Changelog:
> v1: 
>  * Squashed two VFIO patches into one
>  * Added Acked-by/Reviewed-by tags
>  * Fix docs spelling errors
>  * Simplified dma_iova_sync() API
>  * Added extra check in dma_iova_destroy() if mapped size to make code more clear
>  * Fixed checkpatch warnings in p2p patch
>  * Changed implementation of VFIO mlx5 mlx5vf_add_migration_pages() to
>    be more general
>  * Reduced the number of changes in VFIO patch
> v0: https://lore.kernel.org/all/cover.1730037276.git.leon@kernel.org
> 
> ----------------------------------------------------------------------------
> The code can be downloaded from:
> https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git tag:dma-split-oct-30

On Christoph's request, I tested this series last week and saw some
pretty significant performance regressions on my box. I don't know what
the status is in terms of that, just want to make sure something like
this doesn't get merged until that is both fully understood and sorted
out.

-- 
Jens Axboe