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    SubjectRe: [PATCH v2 0/5] mm/migrate: avoid device private invalidations
    On Mon, Jul 13, 2020 at 10:21:44AM -0700, Ralph Campbell wrote:
    > The goal for this series is to avoid device private memory TLB
    > invalidations when migrating a range of addresses from system
    > memory to device private memory and some of those pages have already
    > been migrated. The approach taken is to introduce a new mmu notifier
    > invalidation event type and use that in the device driver to skip
    > invalidation callbacks from migrate_vma_setup(). The device driver is
    > also then expected to handle device MMU invalidations as part of the
    > migrate_vma_setup(), migrate_vma_pages(), migrate_vma_finalize() process.
    > Note that this is opt-in. A device driver can simply invalidate its MMU
    > in the mmu notifier callback and not handle MMU invalidations in the
    > migration sequence.
    >
    > This series is based on Jason Gunthorpe's HMM tree (linux-5.8.0-rc4).
    >
    > Also, this replaces the need for the following two patches I sent:
    > ("mm: fix migrate_vma_setup() src_owner and normal pages")
    > https://lore.kernel.org/linux-mm/20200622222008.9971-1-rcampbell@nvidia.com
    > ("nouveau: fix mixed normal and device private page migration")
    > https://lore.kernel.org/lkml/20200622233854.10889-3-rcampbell@nvidia.com
    >
    > Changes in v2:
    > Rebase to Jason Gunthorpe's HMM tree.
    > Added reviewed-by from Bharata B Rao.
    > Rename the mmu_notifier_range::data field to migrate_pgmap_owner as
    > suggested by Jason Gunthorpe.

    I didn't see anything stand out in this at this point, did you intend
    this to go to the HMM tree?

    Thanks,
    Jason

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