[v2,0/3] HMM tests and minor fixes

Message

Ralph Campbell Oct. 15, 2019, 8:48 p.m. UTC

These changes are based on Jason's rdma/hmm branch (5.4.0-rc1).
Patch 1 was previously posted here [1] but was dropped from that orginal
series. Hopefully, the tests will reduce concerns about edge conditions.
I'm sure more tests could be usefully added but I thought this was a good
starting point.

Changes since v1:
Rebased to Jason's rdma/hmm branch (5.4.0-rc1).
Cleaned up locking for the test driver's page tables.
Incorporated Christoph Hellwig's comments.

[1] https://lore.kernel.org/linux-mm/[e-mail]/

Ralph Campbell (3):
  mm/hmm: make full use of walk_page_range()
  mm/hmm: allow snapshot of the special zero page
  mm/hmm/test: add self tests for HMM

 MAINTAINERS                            |    3 +
 drivers/char/Kconfig                   |   11 +
 drivers/char/Makefile                  |    1 +
 drivers/char/hmm_dmirror.c             | 1574 ++++++++++++++++++++++++
 include/Kbuild                         |    1 +
 include/uapi/linux/hmm_dmirror.h       |   74 ++
 mm/hmm.c                               |  147 ++-
 tools/testing/selftests/vm/.gitignore  |    1 +
 tools/testing/selftests/vm/Makefile    |    3 +
 tools/testing/selftests/vm/config      |    3 +
 tools/testing/selftests/vm/hmm-tests.c | 1311 ++++++++++++++++++++
 tools/testing/selftests/vm/run_vmtests |   16 +
 tools/testing/selftests/vm/test_hmm.sh |   97 ++
 13 files changed, 3178 insertions(+), 64 deletions(-)
 create mode 100644 drivers/char/hmm_dmirror.c
 create mode 100644 include/uapi/linux/hmm_dmirror.h
 create mode 100644 tools/testing/selftests/vm/hmm-tests.c
 create mode 100755 tools/testing/selftests/vm/test_hmm.sh