[PATCH v2 00/53] make MM selftests more CI friendly

[Mike Rapoport]

From: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>

Hi,

There's a lot of dancing around HugeTLB settings in run_vmtests.sh.
Some test need just a few default huge pages, some require at least 256 MB, and
some just skip lots of tests if huge pages of all supported sizes are not
available.

The goal of this set is to make tests deal with HugeTLB setup and teardown.

There are already convenient helpers that allow easy reading and writing of
/proc and /sysfs, so adding a few APIs that will detect and update HugeTLB
settings shouldn't be a big deal. But these nice helpers use kselftest
framework, and many of HugeTLB (and even THP) test don't, so as a result this
patchset also includes a lot of churn for conversion of those tests to
kselftest framework (patches 7-19).

The series break out:
patches 1-4:   small fixes
patches 7-19:  mechanical conversion to kselftest framework
patches 20-26: extension of thp_settings to hugepage_settings to also include
               HugeTLB helpers
patches 27-28: add helpers for setting up SHM limits in hugetlb-shm and
               thuge-gen tests
patches 29-51: integrate the new APIs in all the tests that use HugeTLB
patches 52-53: drop HugeTLB setup from run_vmtests.sh

I belive at this point this can go to mm-new and wait there for more review
feedback.

Based on mm-stable-2026-04-18-02-14

v2 changes:
* fix hugetlb mmap tests to actually test file mappings
* increase maximal tests number in khugepaged
* add tags, thanks everyone!

v1: https://lore.kernel.org/all/20260406141735.2179309-1-rppt@xxxxxxxxxx

Mike Rapoport (Microsoft) (53):
  selftests/mm: hugetlb-read-hwpoison: add SIGBUS handler
  selftests/mm: khugepaged: enable collapse_single_pte_entry_compound for shmem
  selftests/mm: migration: don't assume hupe page is TWOMEG
  selftests/mm: run_vmtests.sh: don't gate THP and KSM tests on HAVE_HUGEPAGES
  selftests/mm: merge map_hugetlb into hugepage-mmap
  selftests/mm: rename hugepage-* tests to hugetlb-*
  selftests/mm: hugetlb-shm: use kselftest framework
  selftests/mm: hugetlb-vmemmap: use kselftest framework
  selftests/mm: hugetlb-madvise: use kselftest framework
  selftests/mm: hugetlb_madv_vs_map: use kselftest framework
  selftests/mm: hugetlb-read-hwpoison: use kselftest framework
  selftests/mm: khugepaged: group tests in an array
  selftests/mm: khugepaged: use ksefltest framework
  selftests/mm: ksm_tests: use kselftest framework
  selftests/mm: protection_keys: use descriptive test names in TAP output
  selftests/mm: protection_keys: use kselftest framework
  selftests/mm: uffd-stress: use kselftest framework
  selftests/mm: uffd-unit-tests: use kselftest framework
  selftests/mm: va_high_addr_switch: use kselftest framework
  selftests/mm: add atexit() and signal handlers to thp_settings
  selftests/mm: rename thp_settings.[ch] to hugepage_settings.[ch]
  selftests/mm: move HugeTLB helpers to hugepage_settings
  selftests/mm: hugepage_settings: use unsigned long in detect_hugetlb_page_size
  selftests/mm: hugepage_settings: add APIs to get and set nr_hugepages
  selftests/mm: hugepage_settings: rename get_free_hugepages()
  selftests/mm: hugepage_settings: add APIs for HugeTLB setup and teardown
  selftests/mm: move read_file(), read_num() and write_num() to vm_util
  selftests/mm: vm_util: add helpers to set and restore shm limits
  selftests/mm: compaction_test: use HugeTLB helpers ...
  selftests/mm: cow: add setup of HugeTLB pages
  selftests/mm: gup_longterm: add setup of HugeTLB pages
  selftests/mm: gup_test: add setup of HugeTLB pages
  selftests/mm: hmm-tests: add setup of HugeTLB pages
  selftests/mm: hugepage_dio: add setup of HugeTLB pages
  selftests/mm: hugetlb_fault_after_madv: add setup of HugeTLB pages
  selftests/mm: hugetlb-madvise: add setup of HugeTLB pages
  selftests/mm: hugetlb_madv_vs_map: add setup of HugeTLB pages
  selftests/mm: hugetlb-mmap: add setup of HugeTLB pages
  selftests/mm: hugetlb-mremap: add setup of HugeTLB pages
  selftests/mm: hugetlb-shm: add setup of HugeTLB pages
  selftests/mm: hugetlb-soft-online: add setup of HugeTLB pages
  selftests/mm: hugetlb-vmemmap: add setup of HugeTLB pages
  selftests/mm: migration: add setup of HugeTLB pages
  selftests/mm: pagemap_ioctl: add setup of HugeTLB pages
  selftests/mm: protection_keys: use library code for HugeTLB setup
  selftests/mm: thuge-gen: add setup of HugeTLB pages
  selftests/mm: uffd-stress: use hugetlb_save and alloc huge pages
  selftests/mm: uffd-unit-tests: add setup of HugeTLB pages
  selftests/mm: uffd-wp-mremap: add setup of HugeTLB pages
  selftests/mm: va_high_addr_switch: add setup of HugeTLB pages
  selftests/mm: va_high_addr_switch.sh: drop huge pages setup
  selftests/mm: run_vmtests.sh: free memory if available memory is low
  selftests/mm: run_vmtests.sh: drop detection and setup of HugeTLB

 tools/testing/selftests/mm/.gitignore         |   4 +
 tools/testing/selftests/mm/Makefile           |  13 +-
 tools/testing/selftests/mm/compaction_test.c  | 113 +----
 tools/testing/selftests/mm/cow.c              |  29 +-
 .../selftests/mm/folio_split_race_test.c      |   2 +-
 tools/testing/selftests/mm/guard-regions.c    |   2 +-
 tools/testing/selftests/mm/gup_longterm.c     |   3 +-
 tools/testing/selftests/mm/gup_test.c         |  12 +
 tools/testing/selftests/mm/hmm-tests.c        |  24 +-
 tools/testing/selftests/mm/hugepage-mmap.c    |  78 ----
 .../{thp_settings.c => hugepage_settings.c}   | 284 +++++++++++--
 .../{thp_settings.h => hugepage_settings.h}   |  75 +++-
 tools/testing/selftests/mm/hugetlb-madvise.c  | 209 ++++------
 tools/testing/selftests/mm/hugetlb-mmap.c     | 140 +++++++
 .../{hugepage-mremap.c => hugetlb-mremap.c}   |  13 +-
 .../selftests/mm/hugetlb-read-hwpoison.c      | 123 +++---
 .../mm/{hugepage-shm.c => hugetlb-shm.c}      |  65 ++-
 .../selftests/mm/hugetlb-soft-offline.c       |  45 +-
 .../{hugepage-vmemmap.c => hugetlb-vmemmap.c} |  46 +-
 tools/testing/selftests/mm/hugetlb_dio.c      |  15 +-
 .../selftests/mm/hugetlb_fault_after_madv.c   |   7 +-
 .../selftests/mm/hugetlb_madv_vs_map.c        |  22 +-
 tools/testing/selftests/mm/khugepaged.c       | 394 ++++++++----------
 tools/testing/selftests/mm/ksm_tests.c        | 182 ++++----
 tools/testing/selftests/mm/map_hugetlb.c      |  88 ----
 tools/testing/selftests/mm/migration.c        |  54 ++-
 tools/testing/selftests/mm/pagemap_ioctl.c    |  13 +-
 tools/testing/selftests/mm/pkey-helpers.h     |   6 +-
 .../testing/selftests/mm/prctl_thp_disable.c  |   2 +-
 tools/testing/selftests/mm/protection_keys.c  | 131 +++---
 tools/testing/selftests/mm/run_vmtests.sh     | 177 ++------
 tools/testing/selftests/mm/soft-dirty.c       |   2 +-
 .../selftests/mm/split_huge_page_test.c       |   2 +-
 tools/testing/selftests/mm/thuge-gen.c        |  80 +---
 tools/testing/selftests/mm/transhuge-stress.c |   2 +-
 tools/testing/selftests/mm/uffd-common.h      |   1 +
 tools/testing/selftests/mm/uffd-stress.c      |  44 +-
 tools/testing/selftests/mm/uffd-unit-tests.c  | 110 +++--
 tools/testing/selftests/mm/uffd-wp-mremap.c   |  12 +-
 .../selftests/mm/va_high_addr_switch.c        |  40 +-
 .../selftests/mm/va_high_addr_switch.sh       |  39 +-
 tools/testing/selftests/mm/vm_util.c          | 133 +++---
 tools/testing/selftests/mm/vm_util.h          |  15 +-
 43 files changed, 1376 insertions(+), 1475 deletions(-)
 delete mode 100644 tools/testing/selftests/mm/hugepage-mmap.c
 rename tools/testing/selftests/mm/{thp_settings.c => hugepage_settings.c} (60%)
 rename tools/testing/selftests/mm/{thp_settings.h => hugepage_settings.h} (55%)
 create mode 100644 tools/testing/selftests/mm/hugetlb-mmap.c
 rename tools/testing/selftests/mm/{hugepage-mremap.c => hugetlb-mremap.c} (94%)
 rename tools/testing/selftests/mm/{hugepage-shm.c => hugetlb-shm.c} (56%)
 rename tools/testing/selftests/mm/{hugepage-vmemmap.c => hugetlb-vmemmap.c} (76%)
 delete mode 100644 tools/testing/selftests/mm/map_hugetlb.c


base-commit: 0b5e8d7999076ac3c490fc18376a404e2626abff
--
2.53.0