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

[Robin Murphy]

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@xxxxxxxxxxxxxxx/msg1693026.html