linux-kernel - Re: [PATCH net-next v10 02/14] net: page_pool: create hooks for custom page providers

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Message-ID: <Zmfv6_uWAVavYJNj@infradead.org>
Date: Mon, 10 Jun 2024 23:34:19 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: Christoph Hellwig <hch@...radead.org>,
	Mina Almasry <almasrymina@...gle.com>, netdev@...r.kernel.org,
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	"David S. Miller" <davem@...emloft.net>,
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	Praveen Kaligineedi <pkaligineedi@...gle.com>
Subject: Re: [PATCH net-next v10 02/14] net: page_pool: create hooks for
 custom page providers

On Fri, Jun 07, 2024 at 02:45:55PM +0100, Pavel Begunkov wrote:
> On 6/5/24 09:24, Christoph Hellwig wrote:
> > On Mon, Jun 03, 2024 at 03:52:32PM +0100, Pavel Begunkov wrote:
> > > The question for Christoph is what exactly is the objection here? Why we
> > > would not be using well defined ops when we know there will be more
> > > users?
> > 
> > The point is that there should be no more users.  If you need another
> 
> Does that "No more" stops after devmem tcp?

There should be no other memory source other than the page allocator
and dmabuf.  If you need different life time control for your
zero copy proposal don't mix that up with the contol of the memory
source.