[Patch v3 0/2] assert rmap behaves as expected

[Wei Yang <richard.weiyang@gmail.com>]

As David suggested, currently we don't have a high level test case to
verify the behavior of rmap. This patch set introduce the verification
on rmap by migration.

Patch 1 is a preparation to move ksm related operations into vm_util.
Patch 2 is the new test case for rmap.

Currently it covers following four scenarios:

  * anonymous page
  * shmem page
  * pagecache page
  * ksm page

v2->v3:
  * handle ksm error return in worker
  * rebase on current mm-unstable
v1->v2:
  * do check on file opening in init_global_file_handlers()
  * factor out ksm_merge() and ksm_unmerge() instead of partial of it
  * align the return value of helpers: 0 on success, -errno on error
  * skip instead of assert if numa not available
  * check ksm sys file before continue
  * use private anonymous map instead of shared map
  * check pfn instead of content
  * retry migrate
  * fault in region for each process by FORCE_READ()

RFC->v1:
  * open file in function itself instead of pass fd as parameter
  * fault in the region by accessing it instead of print content

Wei Yang (2):
  selftests/mm: put general ksm operation into vm_util
  selftests/mm: assert rmap behave as expected

 MAINTAINERS                                   |   1 +
 tools/testing/selftests/mm/.gitignore         |   1 +
 tools/testing/selftests/mm/Makefile           |   3 +
 .../selftests/mm/ksm_functional_tests.c       | 134 +-----
 tools/testing/selftests/mm/rmap.c             | 433 ++++++++++++++++++
 tools/testing/selftests/mm/run_vmtests.sh     |   4 +
 tools/testing/selftests/mm/vm_util.c          | 123 +++++
 tools/testing/selftests/mm/vm_util.h          |   7 +
 8 files changed, 595 insertions(+), 111 deletions(-)
 create mode 100644 tools/testing/selftests/mm/rmap.c

-- 
2.34.1