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mm/ksm: test case for prctl fork/exec workflow

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This adds a new test case to the ksm functional tests to make sure that
the KSM setting is inherited by the child process when doing a fork/exec.

Link: https://lkml.kernel.org/r/20230922211141.320789-3-shr@devkernel.io
Signed-off-by: Stefan Roesch <shr@devkernel.io>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Carl Klemm <carl@uvos.xyz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Stefan Roesch 2023-09-22 14:11:41 -07:00 committed by Andrew Morton
parent 3c6f33b727
commit 0374af1da0
1 changed files with 65 additions and 1 deletions
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66
tools/testing/selftests/mm/ksm_functional_tests.c
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@ -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 @@ static void test_prot_none(void)
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();