On Mon, Aug 18, 2025 at 10:00 PM Usama Arif <usamaarif642@xxxxxxxxx> wrote: > > > > On 18/08/2025 06:55, Yafang Shao wrote: > > This self-test verifies that PMD-mapped THP allocation is restricted in > > page faults for tasks within a specific cgroup, while still permitting > > THP allocation via khugepaged. > > > > Since THP allocation depends on various factors (e.g., system memory > > pressure), using the actual allocated THP size for validation is > > unreliable. Instead, we check the return value of get_suggested_order(), > > which indicates whether the system intends to allocate a THP, regardless of > > whether the allocation ultimately succeeds. > > > > Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx> > > --- > > tools/testing/selftests/bpf/config | 3 + > > .../selftests/bpf/prog_tests/thp_adjust.c | 224 ++++++++++++++++++ > > .../selftests/bpf/progs/test_thp_adjust.c | 76 ++++++ > > .../bpf/progs/test_thp_adjust_failure.c | 25 ++ > > 4 files changed, 328 insertions(+) > > create mode 100644 tools/testing/selftests/bpf/prog_tests/thp_adjust.c > > create mode 100644 tools/testing/selftests/bpf/progs/test_thp_adjust.c > > create mode 100644 tools/testing/selftests/bpf/progs/test_thp_adjust_failure.c > > > > I think would be good to add selftests to make sure the bpf programs are working > after fork/exec as intended. Good suggestion. I will add a self test for it. -- Regards Yafang
