diff options
| -rw-r--r-- | tools/testing/selftests/mm/ksm_functional_tests.c | 66 |
1 files changed, 65 insertions, 1 deletions
diff --git a/tools/testing/selftests/mm/ksm_functional_tests.c b/tools/testing/selftests/mm/ksm_functional_tests.c index 901e950f9138..fbff0dd09191 100644 --- a/tools/testing/selftests/mm/ksm_functional_tests.c +++ b/tools/testing/selftests/mm/ksm_functional_tests.c @@ -26,6 +26,7 @@ #define KiB 1024u #define MiB (1024 * KiB) +#define FORK_EXEC_CHILD_PRG_NAME "ksm_fork_exec_child" static int mem_fd; static int ksm_fd; @@ -479,6 +480,64 @@ static void test_prctl_fork(void) ksft_test_result_pass("PR_SET_MEMORY_MERGE value is inherited\n"); } +static int ksm_fork_exec_child(void) +{ + /* Test if KSM is enabled for the process. */ + return prctl(PR_GET_MEMORY_MERGE, 0, 0, 0, 0) == 1; +} + +static void test_prctl_fork_exec(void) +{ + int ret, status; + pid_t child_pid; + + ksft_print_msg("[RUN] %s\n", __func__); + + ret = prctl(PR_SET_MEMORY_MERGE, 1, 0, 0, 0); + if (ret < 0 && errno == EINVAL) { + ksft_test_result_skip("PR_SET_MEMORY_MERGE not supported\n"); + return; + } else if (ret) { + ksft_test_result_fail("PR_SET_MEMORY_MERGE=1 failed\n"); + return; + } + + child_pid = fork(); + if (child_pid == -1) { + ksft_test_result_skip("fork() failed\n"); + return; + } else if (child_pid == 0) { + char *prg_name = "./ksm_functional_tests"; + char *argv_for_program[] = { prg_name, FORK_EXEC_CHILD_PRG_NAME }; + + execv(prg_name, argv_for_program); + return; + } + + if (waitpid(child_pid, &status, 0) > 0) { + if (WIFEXITED(status)) { + status = WEXITSTATUS(status); + if (status) { + ksft_test_result_fail("KSM not enabled\n"); + return; + } + } else { + ksft_test_result_fail("program didn't terminate normally\n"); + return; + } + } else { + ksft_test_result_fail("waitpid() failed\n"); + return; + } + + if (prctl(PR_SET_MEMORY_MERGE, 0, 0, 0, 0)) { + ksft_test_result_fail("PR_SET_MEMORY_MERGE=0 failed\n"); + return; + } + + ksft_test_result_pass("PR_SET_MEMORY_MERGE value is inherited\n"); +} + static void test_prctl_unmerge(void) { const unsigned int size = 2 * MiB; @@ -536,9 +595,13 @@ unmap: int main(int argc, char **argv) { - unsigned int tests = 7; + unsigned int tests = 8; int err; + if (argc > 1 && !strcmp(argv[1], FORK_EXEC_CHILD_PRG_NAME)) { + exit(ksm_fork_exec_child() == 1 ? 0 : 1); + } + #ifdef __NR_userfaultfd tests++; #endif @@ -576,6 +639,7 @@ int main(int argc, char **argv) test_prctl(); test_prctl_fork(); + test_prctl_fork_exec(); test_prctl_unmerge(); err = ksft_get_fail_cnt(); |