diff options
| -rw-r--r-- | tools/testing/selftests/futex/functional/futex_priv_hash.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/tools/testing/selftests/futex/functional/futex_priv_hash.c b/tools/testing/selftests/futex/functional/futex_priv_hash.c index 24a92dc94eb8..625e3be4129c 100644 --- a/tools/testing/selftests/futex/functional/futex_priv_hash.c +++ b/tools/testing/selftests/futex/functional/futex_priv_hash.c @@ -111,6 +111,30 @@ static void join_max_threads(void) } } +#define SEC_IN_NSEC 1000000000 +#define MSEC_IN_NSEC 1000000 + +static void futex_dummy_op(void) +{ + pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; + struct timespec timeout; + int ret; + + pthread_mutex_lock(&lock); + clock_gettime(CLOCK_REALTIME, &timeout); + timeout.tv_nsec += 100 * MSEC_IN_NSEC; + if (timeout.tv_nsec >= SEC_IN_NSEC) { + timeout.tv_nsec -= SEC_IN_NSEC; + timeout.tv_sec++; + } + ret = pthread_mutex_timedlock(&lock, &timeout); + if (ret == 0) + ksft_exit_fail_msg("Succeffuly locked an already locked mutex.\n"); + + if (ret != ETIMEDOUT) + ksft_exit_fail_msg("pthread_mutex_timedlock() did not timeout: %d.\n", ret); +} + static void usage(char *prog) { printf("Usage: %s\n", prog); @@ -129,7 +153,7 @@ int main(int argc, char *argv[]) int futex_slots1, futex_slotsn, online_cpus; pthread_mutexattr_t mutex_attr_pi; int use_global_hash = 0; - int ret; + int ret, retry = 20; int c; while ((c = getopt(argc, argv, "cghv:")) != -1) { @@ -208,8 +232,24 @@ int main(int argc, char *argv[]) */ ksft_print_msg("Online CPUs: %d\n", online_cpus); if (online_cpus > 16) { +retry_getslots: futex_slotsn = futex_hash_slots_get(); if (futex_slotsn < 0 || futex_slots1 == futex_slotsn) { + retry--; + /* + * Auto scaling on thread creation can be slightly delayed + * because it waits for a RCU grace period twice. The new + * private hash is assigned upon the first futex operation + * after grace period. + * To cover all this for testing purposes the function + * below will acquire a lock and acquire it again with a + * 100ms timeout which must timeout. This ensures we + * sleep for 100ms and issue a futex operation. + */ + if (retry > 0) { + futex_dummy_op(); + goto retry_getslots; + } ksft_print_msg("Expected increase of hash buckets but got: %d -> %d\n", futex_slots1, futex_slotsn); ksft_exit_fail_msg(test_msg_auto_inc); |