diff options
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/refperf.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/kernel/rcu/refperf.c b/kernel/rcu/refperf.c index 61161530acc8..4d686fdc3105 100644 --- a/kernel/rcu/refperf.c +++ b/kernel/rcu/refperf.c @@ -57,7 +57,10 @@ MODULE_PARM_DESC(perf_type, "Type of test (rcu, srcu, refcnt, rwsem, rwlock."); torture_param(int, verbose, 0, "Enable verbose debugging printk()s"); -// Number of loops per experiment, all readers execute an operation concurrently +// Wait until there are multiple CPUs before starting test. +torture_param(int, holdoff, IS_BUILTIN(CONFIG_RCU_REF_PERF_TEST) ? 10 : 0, + "Holdoff time before test start (s)"); +// Number of loops per experiment, all readers execute operations concurrently. torture_param(long, loops, 10000000, "Number of loops per experiment."); #ifdef MODULE @@ -248,6 +251,8 @@ ref_perf_reader(void *arg) set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); set_user_nice(current, MAX_NICE); atomic_inc(&n_init); + if (holdoff) + schedule_timeout_interruptible(holdoff * HZ); repeat: VERBOSE_PERFOUT("ref_perf_reader %ld: waiting to start next experiment on cpu %d", me, smp_processor_id()); @@ -357,6 +362,8 @@ static int main_func(void *arg) // Wait for all threads to start. wait_event(main_wq, atomic_read(&n_init) == (nreaders + 1)); + if (holdoff) + schedule_timeout_interruptible(holdoff * HZ); // Start exp readers up per experiment for (exp = 0; exp < nreaders && !torture_must_stop(); exp++) { @@ -420,8 +427,8 @@ static void ref_perf_print_module_parms(struct ref_perf_ops *cur_ops, const char *tag) { pr_alert("%s" PERF_FLAG - "--- %s: verbose=%d shutdown=%d loops=%ld\n", perf_type, tag, - verbose, shutdown, loops); + "--- %s: verbose=%d shutdown=%d holdoff=%d loops=%ld\n", perf_type, tag, + verbose, shutdown, holdoff, loops); } static void |