[v2,0/2] New selftest for mm

Message

Breno Leitao Oct. 5, 2023, 4:39 p.m. UTC

This is a simple test case that reproduces an mm problem[1], where a page
fault races with madvise(), and it is not trivial to reproduce and
debug.

This test-case aims to avoid such race problems from happening again,
impacting workloads that leverages external allocators, such as
tcmalloc, jemalloc, etc.

Changelog:
---------

V2:
 * Remove some unnecessary checks
 * Skip the test instead of failing in some cases

[1] https://lore.kernel.org/all/[e-mail]/#r

Breno Leitao (2):
  selftests/mm: export get_free_hugepages()
  selftests/mm: Add a new test for madv and hugetlb

 tools/testing/selftests/mm/Makefile           |  1 +
 tools/testing/selftests/mm/hugetlb-madvise.c  | 19 -----
 .../selftests/mm/hugetlb_fault_after_madv.c   | 73 +++++++++++++++++++
 tools/testing/selftests/mm/run_vmtests.sh     |  4 +
 tools/testing/selftests/mm/vm_util.c          | 19 +++++
 tools/testing/selftests/mm/vm_util.h          |  1 +
 6 files changed, 98 insertions(+), 19 deletions(-)
 create mode 100644 tools/testing/selftests/mm/hugetlb_fault_after_madv.c