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Date:   Mon, 11 Feb 2019 15:38:22 +0000
From:   Tariq Toukan <>
To:     Matthew Wilcox <>,
        Tariq Toukan <>
CC:     Ilias Apalodimas <>,
        David Miller <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>
Subject: Re: [RFC, PATCH] net: page_pool: Don't use page->private to store

On 2/11/2019 2:12 PM, Matthew Wilcox wrote:
> On Mon, Feb 11, 2019 at 08:53:19AM +0000, Tariq Toukan wrote:
>> It's great to use the struct page to store its dma mapping, but I am
>> worried about extensibility.
>> page_pool is evolving, and it would need several more per-page fields.
>> One of them would be pageref_bias, a planned optimization to reduce the
>> number of the costly atomic pageref operations (and replace existing
>> code in several drivers).
> There's space for five words (20 or 40 bytes on 32/64 bit).

OK so this is good for now, and for the near future.
Fine by me.


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