linux-kernel - Re: [PATCH v3 0/2] Optimize dma_*_from

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Message-ID: <CALdTtnu=WdYbqyq57EkB-=rsyz72SW-J8oyD7f6Xm-da2OgRgQ@mail.gmail.com>
Date:   Fri, 24 May 2019 14:03:25 -0600
From:   dann frazier <dann.frazier@...onical.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     Christoph Hellwig <hch@....de>,
        Robin Murphy <robin.murphy@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>, vdumpa@...dia.com,
        linux@...linux.org.uk, Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, chris@...kel.net,
        jcmvbkbc@...il.com, joro@...tes.org, dwmw2@...radead.org,
        tony@...mide.com, akpm@...ux-foundation.org, sfr@...b.auug.org.au,
        treding@...dia.com, keescook@...omium.org, iamjoonsoo.kim@....com,
        wsa+renesas@...g-engineering.com,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
        iommu@...ts.linux-foundation.org
Subject: Re: [PATCH v3 0/2] Optimize dma_*_from_contiguous calls

On Thu, May 23, 2019 at 10:08 PM Nicolin Chen <nicoleotsuka@...il.com> wrote:
>
> [ Per discussion at v1, we decide to add two new functions and start
>   replacing callers one by one. For this series, it only touches the
>   dma-direct part. And instead of merging two PATCHes, I still keep
>   them separate so that we may easily revert PATCH-2 if anything bad
>   happens as last time -- PATCH-1 is supposed to be a safe cleanup. ]
>
> This series of patches try to optimize dma_*_from_contiguous calls:
> PATCH-1 abstracts two new functions and applies to dma-direct.c file.
> PATCH-2 saves single pages and reduce fragmentations from CMA area.
>
> Please check their commit messages for detail changelog.
>
> Nicolin Chen (2):
>   dma-contiguous: Abstract dma_{alloc,free}_contiguous()
>   dma-contiguous: Use fallback alloc_pages for single pages
>
>  include/linux/dma-contiguous.h | 11 +++++++
>  kernel/dma/contiguous.c        | 57 ++++++++++++++++++++++++++++++++++
>  kernel/dma/direct.c            | 24 +++-----------
>  3 files changed, 72 insertions(+), 20 deletions(-)

Thanks Nicolin. Tested on a HiSilicon D06 system.

Tested-by: dann frazier <dann.frazier@...onical.com>