A process can enable KSM with the prctl system call. When the process is forked the KSM flag is inherited by the child process. However if the process is executing an exec system call directly after the fork, the KSM setting is cleared. This patch series addresses this problem. 1) Change the mask in coredump.h for execing a new process 2) Add a new test case in ksm_functional_tests Stefan Roesch (2): mm/ksm: support fork/exec for prctl mm/ksm: Test case for prctl fork/exec workflow include/linux/sched/coredump.h | 7 ++- tools/testing/selftests/mm/Makefile | 2 + .../selftests/mm/ksm_fork_exec_child.c | 9 ++++ .../selftests/mm/ksm_functional_tests.c | 50 ++++++++++++++++++- 4 files changed, 65 insertions(+), 3 deletions(-) create mode 100644 tools/testing/selftests/mm/ksm_fork_exec_child.c base-commit: 15bcc9730fcd7526a3b92eff105d6701767a53bb -- 2.39.3
