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

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Date: Mon, 17 Jun 2024 19:04:43 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: Mina Almasry <almasrymina@...gle.com>, netdev@...r.kernel.org,
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Subject: Re: [PATCH net-next v10 02/14] net: page_pool: create hooks for
 custom page providers

On 6/11/24 07:34, Christoph Hellwig wrote:
> 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.

No idea how I'm mixing it up when I was explaining exactly this
all along as well as that the callback (and presumably the call
site in general) you was so eager to nack is used exactly to
implement the life time control.

-- 
Pavel Begunkov