Re: [PATCH v3 net-next 08/14] mlx4: use order-0 pages for RX

From: Jesper Dangaard Brouer <redacted>
Date: Tue, 14 Feb 2017 20:38:22 +0100

On Tue, 14 Feb 2017 12:04:26 -0500 (EST)
David Miller [off-list ref] wrote:

quoted

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.

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