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SubjectRe: [PATCH 00/10] HMM updates for 5.1

On 1/29/19 8:54 AM, wrote:
> From: Jérôme Glisse <>
> This patchset improves the HMM driver API and add support for hugetlbfs
> and DAX mirroring. The improvement motivation was to make the ODP to HMM
> conversion easier [1]. Because we have nouveau bits schedule for 5.1 and
> to avoid any multi-tree synchronization this patchset adds few lines of
> inline function that wrap the existing HMM driver API to the improved
> API. The nouveau driver was tested before and after this patchset and it
> builds and works on both case so there is no merging issue [2]. The
> nouveau bit are queue up for 5.1 so this is why i added those inline.
> If this get merge in 5.1 the plans is to merge the HMM to ODP in 5.2 or
> 5.3 if testing shows any issues (so far no issues has been found with
> limited testing but Mellanox will be running heavier testing for longer
> time).
> To avoid spamming mm i would like to not cc mm on ODP or nouveau patches,
> however if people prefer to see those on mm mailing list then i can keep
> it cced.
> This is also what i intend to use as a base for AMD and Intel patches
> (v2 with more thing of some rfc which were already posted in the past).
> [1]
> [2]
> Cc: Andrew Morton <>
> Cc: Felix Kuehling <>
> Cc: Christian König <>
> Cc: Ralph Campbell <>
> Cc: John Hubbard <>
> Cc: Jason Gunthorpe <>
> Cc: Dan Williams <>
> Jérôme Glisse (10):
> mm/hmm: use reference counting for HMM struct
> mm/hmm: do not erase snapshot when a range is invalidated
> mm/hmm: improve and rename hmm_vma_get_pfns() to hmm_range_snapshot()
> mm/hmm: improve and rename hmm_vma_fault() to hmm_range_fault()
> mm/hmm: improve driver API to work and wait over a range
> mm/hmm: add default fault flags to avoid the need to pre-fill pfns
> arrays.
> mm/hmm: add an helper function that fault pages and map them to a
> device
> mm/hmm: support hugetlbfs (snap shoting, faulting and DMA mapping)
> mm/hmm: allow to mirror vma of a file on a DAX backed filesystem
> mm/hmm: add helpers for driver to safely take the mmap_sem
> include/linux/hmm.h | 290 ++++++++++--
> mm/hmm.c | 1060 +++++++++++++++++++++++++++++--------------
> 2 files changed, 983 insertions(+), 367 deletions(-)

I have been testing this patch series in addition to [1] with some
success. I wouldn't go as far as saying it is thoroughly tested
but you can add:

Reviewed-by: Ralph Campbell <>

("[PATCH v5 0/9] mmu notifier provide context informations")

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