[v2,0/2] mm/ksm: fix ksm exec support for prctl

Message

Jinjiang Tu March 22, 2024, 6:09 a.m. UTC

commit 3c6f33b7273a ("mm/ksm: support fork/exec for prctl") inherits
MMF_VM_MERGE_ANY flag when a task calls execve(). Howerver, it doesn't
create the mm_slot, so ksmd will not try to scan this task. The first
patch fixes the issue.

The second patch extend the selftests of ksm to verfity the deduplication
really happens after fork/exec inherits ths KSM setting.

Changelog since v1:
  - Add ksm cleanup in __bprm_mm_init() when error occurs.
  - Add some comment.
  - Extend the selftests of ksm fork/exec.

Jinjiang Tu (2):
  mm/ksm: fix ksm exec support for prctl
  selftest/mm: ksm_functional_tests: extend test case for ksm fork/exec

 fs/exec.c                                     | 10 +++
 include/linux/ksm.h                           | 13 +++
 .../selftests/mm/ksm_functional_tests.c       | 79 +++++++++++++++++--
 3 files changed, 96 insertions(+), 6 deletions(-)