Re: [PATCH V2 1/2] Swiotlb: Add swiotlb_alloc_from_low_pages switch

[Christoph Hellwig]

On Fri, Feb 25, 2022 at 10:28:54PM +0800, Tianyu Lan wrote:
>      One more perspective is that one device may have multiple queues and 
> each queues should have independent swiotlb bounce buffer to avoid spin 
> lock overhead. The number of queues is only available in the device
> driver. This means new API needs to be called in the device driver 
> according to queue number.

Well, given how hell bent people are on bounce buffering we might
need some scalability work there anyway.