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The test creates shmem huge pages shared by both a paren= t > and a child processes, where the parent process punches holes in the sh= mem > to cause folio_split() in the kernel and the child process reads the sh= mem > in 16 threads to cause filemap_get_entry() in the kernel. > filemap_get_entry() reads the folio and xarray split by folio_split() > locklessly. The original test[2] is written in rust and uses memfd (shm= em > backed). This C port uses shmem directly. > > Note: the initial rust to C conversion is done by Cursor. > > Link: https://lore.kernel.org/all/CAKNNEtw5_kZomhkugedKMPOG-sxs5Q5OLumW= JdiWXv+C9Yct0w@mail.gmail.com/ [1] > Link: https://github.com/dfinity/thp-madv-remove-test [2] > Signed-off-by: Bas van Dijk > Signed-off-by: Adam Bratschi-Kaye > Signed-off-by: Zi Yan > --- > From V1: > 1. added prctl(PR_SET_PDEATHSIG, SIGTERM) to avoid child looping > forever. > 2. removed page_idx % PUNCH_INTERVAL >=3D 0, since it is a nop. Added a= > comment. > 3. added a child process status check to prevent parent looping forever= > and record that as a failure. > 4. used ksft_exit_skip() instead of ksft_finished() when the program is= > not running as root. > 5. restored THP settings properly when the program exits abnormally. > > tools/testing/selftests/mm/Makefile | 1 + > .../selftests/mm/folio_split_race_test.c | 431 ++++++++++++++++++= > tools/testing/selftests/mm/run_vmtests.sh | 2 + > 3 files changed, 434 insertions(+) > create mode 100644 tools/testing/selftests/mm/folio_split_race_test.c > It seems that I sent a stale version. Will update it. Sorry for the noise= =2E Best Regards, Yan, Zi