diff options
Diffstat (limited to 'tools/testing/selftests/mm/ksm_functional_tests.c')
| -rw-r--r-- | tools/testing/selftests/mm/ksm_functional_tests.c | 97 |
1 files changed, 91 insertions, 6 deletions
diff --git a/tools/testing/selftests/mm/ksm_functional_tests.c b/tools/testing/selftests/mm/ksm_functional_tests.c index d8b5b4930412..7bc9fc17c9f0 100644 --- a/tools/testing/selftests/mm/ksm_functional_tests.c +++ b/tools/testing/selftests/mm/ksm_functional_tests.c @@ -15,8 +15,10 @@ #include <errno.h> #include <fcntl.h> #include <sys/mman.h> +#include <sys/prctl.h> #include <sys/syscall.h> #include <sys/ioctl.h> +#include <sys/wait.h> #include <linux/userfaultfd.h> #include "../kselftest.h" @@ -178,7 +180,6 @@ unmap: static void test_unmerge_uffd_wp(void) { struct uffdio_writeprotect uffd_writeprotect; - struct uffdio_register uffdio_register; const unsigned int size = 2 * MiB; struct uffdio_api uffdio_api; char *map; @@ -210,10 +211,7 @@ static void test_unmerge_uffd_wp(void) } /* Register UFFD-WP, no need for an actual handler. */ - uffdio_register.range.start = (unsigned long) map; - uffdio_register.range.len = size; - uffdio_register.mode = UFFDIO_REGISTER_MODE_WP; - if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register) < 0) { + if (uffd_register(uffd, map, size, false, true, false)) { ksft_test_result_fail("UFFDIO_REGISTER_MODE_WP failed\n"); goto close_uffd; } @@ -241,9 +239,93 @@ unmap: } #endif +/* Verify that KSM can be enabled / queried with prctl. */ +static void test_prctl(void) +{ + int ret; + + 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; + } + + ret = prctl(PR_GET_MEMORY_MERGE, 0, 0, 0, 0); + if (ret < 0) { + ksft_test_result_fail("PR_GET_MEMORY_MERGE failed\n"); + return; + } else if (ret != 1) { + ksft_test_result_fail("PR_SET_MEMORY_MERGE=1 not effective\n"); + return; + } + + ret = prctl(PR_SET_MEMORY_MERGE, 0, 0, 0, 0); + if (ret) { + ksft_test_result_fail("PR_SET_MEMORY_MERGE=0 failed\n"); + return; + } + + ret = prctl(PR_GET_MEMORY_MERGE, 0, 0, 0, 0); + if (ret < 0) { + ksft_test_result_fail("PR_GET_MEMORY_MERGE failed\n"); + return; + } else if (ret != 0) { + ksft_test_result_fail("PR_SET_MEMORY_MERGE=0 not effective\n"); + return; + } + + ksft_test_result_pass("Setting/clearing PR_SET_MEMORY_MERGE works\n"); +} + +/* Verify that prctl ksm flag is inherited. */ +static void test_prctl_fork(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) { + exit(prctl(PR_GET_MEMORY_MERGE, 0, 0, 0, 0)); + } else if (child_pid < 0) { + ksft_test_result_fail("fork() failed\n"); + return; + } + + if (waitpid(child_pid, &status, 0) < 0) { + ksft_test_result_fail("waitpid() failed\n"); + return; + } else if (WEXITSTATUS(status) != 1) { + ksft_test_result_fail("unexpected PR_GET_MEMORY_MERGE result in child\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"); +} + int main(int argc, char **argv) { - unsigned int tests = 2; + unsigned int tests = 4; int err; #ifdef __NR_userfaultfd @@ -271,6 +353,9 @@ int main(int argc, char **argv) test_unmerge_uffd_wp(); #endif + test_prctl(); + test_prctl_fork(); + err = ksft_get_fail_cnt(); if (err) ksft_exit_fail_msg("%d out of %d tests failed\n", |