Re: [PATCH v2 00/26] IB: Optimize DMA mapping

From	Sagi Grimberg <sagi@grimberg.me>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 00/26] IB: Optimize DMA mapping
Date	2017-01-13 22:30 +0100
Message-ID	<sZhA6-5To-9@gated-at.bofh.it> (permalink)
References	<sYT4K-7Od-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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> Hello Doug,
>
> As you know there are two sets of DMA mapping operations in the Linux
> kernel:
> - One set of DMA mapping operations that is used by most drivers.
> - Another set of DMA mapping operations that is only used by the RDMA
>   drivers.
> Having two sets of DMA mapping operations is not only a source of
> confusion but also a source of unnecessary overhead. The DMA mapping
> operations are in the hot path so it is important that the overhead
> of these operations is as low as possible. Hence this patch series
> that converts the RDMA code to the standard DMA mapping API and
> thereby eliminates the if (dev->dma_ops) test from the hot path. An
> additional benefit is that the size of HW and SW drivers that do not
> use DMA is reduced by switching to dma_virt_ops.

This looks really good!

Thanks Bart for doing this,

For the series:

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

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Re: [PATCH v2 00/26] IB: Optimize DMA mapping Sagi Grimberg <sagi@grimberg.me> - 2017-01-13 22:30 +0100

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