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

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Message-ID: <20241031093746.GA88858@unreal>
Date: Thu, 31 Oct 2024 11:37:46 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Christoph Hellwig <hch@....de>
Cc: Jens Axboe <axboe@...nel.dk>, Jason Gunthorpe <jgg@...pe.ca>,
	Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Sagi Grimberg <sagi@...mberg.me>,
	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 Thu, Oct 31, 2024 at 10:21:13AM +0100, Christoph Hellwig wrote:
> On Thu, Oct 31, 2024 at 11:05:30AM +0200, Leon Romanovsky wrote:
> > This series is a subset of the series you tested and doesn't include the
> > block layer changes which most likely were the cause of the performance
> > regression.
> > 
> > This is why I separated the block layer changes from the rest of the series
> > and marked them as RFC.
> > 
> > The current patch set is viable for HMM and VFIO. Can you please retest
> > only this series and leave the block layer changes for later till Christoph
> > finds the answer for the performance regression?
> 
> As the subset doesn't touch block code or code called by block I don't
> think we need Jens to benchmark it, unless he really wants to.

He wrote this sentence in his email, while responding on subset which doesn't change
anything in block layer: "just want to make sure something like this doesn't get merged
until that is both fully understood and sorted out."

This series works like a charm for RDMA (HMM) and VFIO.

Thanks