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The following two patches add selftests to verify that the ksm_merging_pages counter and the global ksm_zero_pages counter are updated correctly during fork. Test Results ============ Without the first patch ----------------------- # [RUN] test_fork_ksm_merging_page_count not ok 10 ksm_merging_page in child: 32 # [RUN] test_fork_global_ksm_zero_pages_count not ok 11 Incorrect global ksm zero page counter after fork With the first patch -------------------- # [RUN] test_fork_ksm_merging_page_count ok 10 ksm_merging_pages is not inherited after fork # [RUN] test_fork_global_ksm_zero_pages_count ok 11 Global ksm zero page count is correct after fork Changes: v1 -> v2 : - Rebased to mm-new branch - Fixed incorrect global ksm_zero_pages counter issue during fork and added a selftest to verify it. v1: https://lore.kernel.org/all/2e662107e01417bf9af23bc7f52863cd538419be.1756211338.git.donettom@linux.ibm.com/ Donet Tom (3): mm/ksm: Fix incorrect KSM counter handling in mm_struct during fork selftests/mm: Added fork inheritance test for ksm_merging_pages counter selftests/mm: Added fork test to verify global ksm_zero_pages counter behavior include/linux/ksm.h | 8 +- .../selftests/mm/ksm_functional_tests.c | 114 +++++++++++++++++- 2 files changed, 120 insertions(+), 2 deletions(-) -- 2.51.0