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SubjectRe: start sorting out the ZONE_DEVICE refcount mess v2
From
Christoph,
Thanks a lot for rebase our patches. I just ran our amdgpu hmm-tests
with this series and all passed.

Regards,
Alex Sierra

On 2/10/2022 1:28 AM, Christoph Hellwig wrote:
> Hi all,
>
> this series removes the offset by one refcount for ZONE_DEVICE pages
> that are freed back to the driver owning them, which is just device
> private ones for now, but also the planned device coherent pages
> and the ehanced p2p ones pending.
>
> It does not address the fsdax pages yet, which will be attacked in a
> follow on series.
>
> Note that if we want to get the p2p series rebased on top of this
> we'll need a git branch for this series. I could offer to host one.
>
> A git tree is available here:
>
> git://git.infradead.org/users/hch/misc.git pgmap-refcount
>
> Gitweb:
>
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/pgmap-refcount
>
> Changes since v1:
> - add a missing memremap.h include in memcontrol.c
> - include rebased versions of the device coherent support and
> device coherent migration support series as well as additional
> cleanup patches
>
> Diffstt:
> arch/arm64/mm/mmu.c | 1
> arch/powerpc/kvm/book3s_hv_uvmem.c | 1
> drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 35 -
> drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 1
> drivers/gpu/drm/drm_cache.c | 2
> drivers/gpu/drm/nouveau/nouveau_dmem.c | 3
> drivers/gpu/drm/nouveau/nouveau_svm.c | 1
> drivers/infiniband/core/rw.c | 1
> drivers/nvdimm/pmem.h | 1
> drivers/nvme/host/pci.c | 1
> drivers/nvme/target/io-cmd-bdev.c | 1
> fs/Kconfig | 2
> fs/fuse/virtio_fs.c | 1
> include/linux/hmm.h | 9
> include/linux/memremap.h | 36 +
> include/linux/migrate.h | 1
> include/linux/mm.h | 59 --
> lib/test_hmm.c | 353 ++++++++++---
> lib/test_hmm_uapi.h | 22
> mm/Kconfig | 7
> mm/Makefile | 1
> mm/gup.c | 127 +++-
> mm/internal.h | 3
> mm/memcontrol.c | 19
> mm/memory-failure.c | 8
> mm/memremap.c | 75 +-
> mm/migrate.c | 763 ----------------------------
> mm/migrate_device.c | 822 +++++++++++++++++++++++++++++++
> mm/rmap.c | 5
> mm/swap.c | 49 -
> tools/testing/selftests/vm/Makefile | 2
> tools/testing/selftests/vm/hmm-tests.c | 204 ++++++-
> tools/testing/selftests/vm/test_hmm.sh | 24
> 33 files changed, 1552 insertions(+), 1088 deletions(-)

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