linux-kernel - Re: [PATCH] dma-mapping: bypass indirect calls for dma-direct

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Date:   Thu, 6 Dec 2018 18:40:27 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     iommu@...ts.linux-foundation.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tariq Toukan <tariqt@...lanox.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Toke Høiland-Jørgensen 
        <toke@...e.dk>, Robin Murphy <robin.murphy@....com>,
        linux-kernel@...r.kernel.org, brouer@...hat.com
Subject: Re: [PATCH] dma-mapping: bypass indirect calls for dma-direct

On Thu,  6 Dec 2018 07:37:20 -0800
Christoph Hellwig <hch@....de> wrote:

> Avoid expensive indirect calls in the fast path DMA mapping
> operations by directly calling the dma_direct_* ops if we are using
> the directly mapped DMA operations.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  include/linux/dma-direct.h  |  17 -----
>  include/linux/dma-mapping.h | 138 +++++++++++++++++++++++++++++++-----
>  kernel/dma/direct.c         |  13 ++--
>  3 files changed, 127 insertions(+), 41 deletions(-)

Hi Christoph,

Is this patch to be applied on top of the other (41) patches I just
tested with my XDP forward workload?

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer