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    SubjectRe: [PATCH -next 0/2] riscv/mm: Enable THP migration
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    Hi Palmer,

    This patchset has been sent for one month ago, I was wondering if you could

    have a review and give a feedback please, thanks.

    On 2021/11/23 22:06, Nanyong Sun wrote:
    > This series enables THP migration on riscv via ARCH_ENABLE_THP_MIGRATION.
    > But first this adjusts PAGE_PROT_NONE to satisfy generic memory semantics
    > like the behavior of pmd_present() and pmd_trans_huge() when in
    > THP splitting or migration.
    >
    > This feature can reduce the time of THP migration by not splits THP
    > before migration and can guarantee the pages after migration are still
    > contiguous.[1]
    >
    > I have tested the below test case on qemu based on riscv after
    > enabling this feature, the throughput of THP migration gains 13x
    > performance improvement:
    > https://github.com/x-y-z/thp-migration-bench
    >
    > I also have tested and passed the test cases under
    > tools/testing/selftests/vm.
    >
    > [1]: https://lwn.net/Articles/723764/
    >
    > Nanyong Sun (2):
    > riscv/mm: Adjust PAGE_PROT_NONE to comply with THP semantics
    > riscv/mm: Enable THP migration
    >
    > arch/riscv/Kconfig | 1 +
    > arch/riscv/include/asm/pgtable-bits.h | 2 +-
    > arch/riscv/include/asm/pgtable.h | 16 +++++++++++-----
    > 3 files changed, 13 insertions(+), 6 deletions(-)
    >

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