linux-kernel - Re: [PATCH 0/4] numa, iommu/smmu: IOMMU/SMMU driver optimization for NUMA systems

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Date:   Wed, 22 Aug 2018 10:57:07 -0700
From:   Ganapatrao Kulkarni <gklkml16@...il.com>
To:     John Garry <john.garry@...wei.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-mm@...ck.org,
        Will Deacon <Will.Deacon@....com>, Tomasz.Nowicki@...ium.com,
        Robert Richter <Robert.Richter@...ium.com>, mhocko@...e.com,
        akpm@...ux-foundation.org, vbabka@...e.cz,
        jnair@...iumnetworks.com,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>,
        Linuxarm <linuxarm@...wei.com>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 0/4] numa, iommu/smmu: IOMMU/SMMU driver optimization for
 NUMA systems

On Wed, Aug 22, 2018 at 9:08 AM John Garry <john.garry@...wei.com> wrote:
>
> On 22/08/2018 15:56, Robin Murphy wrote:
> > Hi John,
> >
> > On 22/08/18 14:44, John Garry wrote:
> >> On 21/09/2017 09:59, Ganapatrao Kulkarni wrote:
> >>> Adding numa aware memory allocations used for iommu dma allocation and
> >>> memory allocated for SMMU stream tables, page walk tables and command
> >>> queues.
> >>>
> >>> With this patch, iperf testing on ThunderX2, with 40G NIC card on
> >>> NODE 1 PCI shown same performance(around 30% improvement) as NODE 0.
> >>>
> >>> Ganapatrao Kulkarni (4):
> >>>   mm: move function alloc_pages_exact_nid out of __meminit
> >>>   numa, iommu/io-pgtable-arm: Use NUMA aware memory allocation for smmu
> >>>     translation tables
> >>>   iommu/arm-smmu-v3: Use NUMA memory allocations for stream tables and
> >>>     comamnd queues
> >>>   iommu/dma, numa: Use NUMA aware memory allocations in
> >>>     __iommu_dma_alloc_pages
> >>>
> >>>  drivers/iommu/arm-smmu-v3.c    | 57
> >>> +++++++++++++++++++++++++++++++++++++-----
> >>>  drivers/iommu/dma-iommu.c      | 17 +++++++------
> >>>  drivers/iommu/io-pgtable-arm.c |  4 ++-
> >>>  include/linux/gfp.h            |  2 +-
> >>>  mm/page_alloc.c                |  3 ++-
> >>>  5 files changed, 67 insertions(+), 16 deletions(-)
> >>>
> >>
> >> Hi Ganapatrao,
> >>
> >> Have you any plans for further work on this patchset? I have not seen
> >> anything since this v1 was posted+discussed.
> >
>
> Hi Robin,
>
> Thanks for the info. I thought I remembered 4b12 but couldn't put my
> finger on it.
>
> > Looks like I ended up doing the version of the io-pgtable change that I
> > suggested here, which was merged recently (4b123757eeaa). Patch #3
> > should also be effectively obsolete now since the SWIOTLB/dma-direct
> > rework (21f237e4d085). Apparently I also started reworking patch #4 in
> > my tree at some point but sidelined it - I think that was at least
> > partly due to another thread[1] which made it seem less clear-cut
> > whether this is always the right thing to do.
>
> Right, so #4 seems less straightforward and not directly related to
> IOMMU driver anyway.
>

thanks Robin for pulling up the patch. I couldn't followup with this
due to other tasks.

> Cheers,
> John
>
> >
> > Robin.
> >
> > [1]
> > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1693026.html
> >
> > .
> >
>
>
thanks,
Ganapat