Re: [PATCH v1 0/5] mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault/prealloc memory

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On 17.03.21 12:06, David Hildenbrand wrote:
Excessive details on MADV_POPULATE_(READ|WRITE) can be found in patch #2.

Now accompanied by minor adjustments and selftests/vm tests.

RFCv2 -> v1
- "mm: fix variable name in declaration of populate_vma_page_range()"
-- Added
- "mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault ..."
-- Fix detection of memory holes when we have to re-lookup the VMA
-- Return -EHWPOISON to user space when we hit HW poisoned pages
-- Make variable names in definition and declaration consistent
- "MAINTAINERS: add tools/testing/selftests/vm/ to MEMORY MANAGEMENT"
-- Added
- "selftests/vm: add protection_keys_32 / protection_keys_64 to gitignore"
-- Added
- "selftests/vm: add test for MADV_POPULATE_(READ|WRITE)"
-- Added

RFC -> RFCv2:
- Fix re-locking (-> set "locked = 1;")
- Don't mimic MAP_POPULATE semantics:
--> Explicit READ/WRITE request instead of selecting it automatically,
     which makes it more generic and better suited for some use cases (e.g., we
     usually want to prefault shmem writable)
--> Require proper access permissions
- Introduce and use faultin_vma_page_range()
--> Properly handle HWPOISON pages (FOLL_HWPOISON)
--> Require proper access permissions (!FOLL_FORCE)
- Let faultin_vma_page_range() check for compatible mappings/permissions
- Extend patch description and add some performance numbers

David Hildenbrand (5):
   mm: make variable names for populate_vma_page_range() consistent
   mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault/prealloc
     memory
   MAINTAINERS: add tools/testing/selftests/vm/ to MEMORY MANAGEMENT
   selftests/vm: add protection_keys_32 / protection_keys_64 to gitignore
   selftests/vm: add test for MADV_POPULATE_(READ|WRITE)

  MAINTAINERS                                |   1 +
  arch/alpha/include/uapi/asm/mman.h         |   3 +
  arch/mips/include/uapi/asm/mman.h          |   3 +
  arch/parisc/include/uapi/asm/mman.h        |   3 +
  arch/xtensa/include/uapi/asm/mman.h        |   3 +
  include/uapi/asm-generic/mman-common.h     |   3 +
  mm/gup.c                                   |  54 ++++
  mm/internal.h                              |   5 +-
  mm/madvise.c                               |  69 +++++
  tools/testing/selftests/vm/.gitignore      |   3 +
  tools/testing/selftests/vm/Makefile        |   1 +
  tools/testing/selftests/vm/madv_populate.c | 342 +++++++++++++++++++++
  tools/testing/selftests/vm/run_vmtests.sh  |  16 +
  13 files changed, 505 insertions(+), 1 deletion(-)
  create mode 100644 tools/testing/selftests/vm/madv_populate.c


Gentle ping.

--
Thanks,

David / dhildenb





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