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. Regards, Tariq
