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From:   Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH 0/4] numa, iommu/smmu: IOMMU/SMMU driver optimization for
 NUMA systems
To:     John Garry <john.garry@huawei.com>,
        Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "Will.Deacon@arm.com" <Will.Deacon@arm.com>,
        "gklkml16@gmail.com" <gklkml16@gmail.com>,
        "Tomasz.Nowicki@cavium.com" <Tomasz.Nowicki@cavium.com>,
        "Robert.Richter@cavium.com" <Robert.Richter@cavium.com>,
        "mhocko@suse.com" <mhocko@suse.com>,
        "akpm@linux-foundation.org" <akpm@linux-foundation.org>,
        "vbabka@suse.cz" <vbabka@suse.cz>,
        "jnair@caviumnetworks.com" <jnair@caviumnetworks.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        "thunder.leizhen@huawei.com" <thunder.leizhen@huawei.com>,
        Linuxarm <linuxarm@huawei.com>, Christoph Hellwig <hch@lst.de>
References: <20170921085922.11659-1-ganapatrao.kulkarni@cavium.com>
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Date:   Wed, 22 Aug 2018 15:56:43 +0100
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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.

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.

Robin.

[1] 
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1693026.html