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

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Message-Id: <20170214.145919.808498227095540599.davem@davemloft.net>
Date:   Tue, 14 Feb 2017 14:59:19 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     brouer@...hat.com
Cc:     ttoukan.linux@...il.com, edumazet@...gle.com,
        alexander.duyck@...il.com, netdev@...r.kernel.org,
        tariqt@...lanox.com, kafai@...com, saeedm@...lanox.com,
        willemb@...gle.com, bblanco@...mgrid.com, ast@...nel.org,
        eric.dumazet@...il.com, linux-mm@...ck.org
Subject: Re: [PATCH v3 net-next 08/14] mlx4: use order-0 pages for RX

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Tue, 14 Feb 2017 20:38:22 +0100

> On Tue, 14 Feb 2017 12:04:26 -0500 (EST)
> David Miller <davem@...emloft.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.