From: Jesper Dangaard Brouer <bro...@redhat.com> Date: Tue, 14 Feb 2017 20:38:22 +0100
> On Tue, 14 Feb 2017 12:04:26 -0500 (EST) > David Miller <da...@davemloft.net> wrote: > >> One path I see around all of this is full integration. Meaning that >> we can free pages into the page allocator which are still DMA mapped. >> And future allocations from that device are prioritized to take still >> DMA mapped objects. > > I like this idea. Are you saying that this should be done per DMA > engine or per device? > > If this is per device, it is almost the page_pool idea. Per-device is simplest, at least at first. Maybe later down the road we can try to pool by "mapping entity" be that a parent IOMMU or something else like a hypervisor managed page table.
