linux-kernel - Re: [RFC PATCH 2/7] block: don't merge different kinds of P2P transfers in a single bio

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Message-ID: <20241104085545.GB24211@lst.de>
Date: Mon, 4 Nov 2024 09:55:45 +0100
From: Christoph Hellwig <hch@....de>
To: Bart Van Assche <bvanassche@....org>
Cc: Leon Romanovsky <leon@...nel.org>, 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>,
	Christoph Hellwig <hch@....de>, 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: [RFC PATCH 2/7] block: don't merge different kinds of P2P
 transfers in a single bio

On Thu, Oct 31, 2024 at 01:58:37PM -0700, Bart Van Assche wrote:
> On 10/27/24 7:21 AM, Leon Romanovsky wrote:
>> +		/*
>> +		 * When doing ZONE_DEVICE-based P2P transfers, all pages in a
>> +		 * bio must be P2P pages from the same device.
>> +		 */
>> +		if ((bio->bi_opf & REQ_P2PDMA) &&
>> +		    !zone_device_pages_have_same_pgmap(bv->bv_page, page))
>> +			return 0;
>
> It's probably too late to change the "zone_device_" prefix into
> something that cannot be confused with a reference to zoned block
> devices?

It's too late and also wrong and also entirely out of scope for this
series.