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rcutorture: Output number of elapsed grace periods 

This commit adds code to print the grace-period number at the start
of the test along with both the grace-period number and the number of
elapsed grace periods at the end of the test.  Note that variants of
RCU)without the notion of a grace-period number (for example, Tiny RCU)
just print zeroes.

[ paulmck: Adjust commit log. ]
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Joel Fernandes (Google) 2020-06-18 16:29:55 -04:00 committed by Paul E. McKenney
parent 83224afd11
commit 959954df0c
1 changed files with 11 additions and 2 deletions
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13
kernel/rcu/rcutorture.c
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@ -172,6 +172,7 @@ static long n_barrier_successes; /* did rcu_barrier test succeed? */
static unsigned long n_read_exits;
static struct list_head rcu_torture_removed;
static unsigned long shutdown_jiffies;
static unsigned long start_gp_seq;
static int rcu_torture_writer_state;
#define RTWS_FIXED_DELAY 0
@ -2469,8 +2470,9 @@ rcu_torture_cleanup(void)
rcutorture_get_gp_data(cur_ops->ttype, &flags, &gp_seq);
srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp, &flags, &gp_seq);
pr_alert("%s: End-test grace-period state: g%lu f%#x\n",
cur_ops->name, gp_seq, flags);
pr_alert("%s: End-test grace-period state: g%ld f%#x total-gps=%ld\n",
cur_ops->name, (long)gp_seq, flags,
rcutorture_seq_diff(gp_seq, start_gp_seq));
torture_stop_kthread(rcu_torture_stats, stats_task);
torture_stop_kthread(rcu_torture_fqs, fqs_task);
if (rcu_torture_can_boost())
@ -2594,6 +2596,8 @@ rcu_torture_init(void)
long i;
int cpu;
int firsterr = 0;
int flags = 0;
unsigned long gp_seq = 0;
static struct rcu_torture_ops *torture_ops[] = {
&rcu_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops,
&busted_srcud_ops, &tasks_ops, &tasks_rude_ops,
@ -2636,6 +2640,11 @@ rcu_torture_init(void)
nrealreaders = 1;
}
rcu_torture_print_module_parms(cur_ops, "Start of test");
rcutorture_get_gp_data(cur_ops->ttype, &flags, &gp_seq);
srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp, &flags, &gp_seq);
start_gp_seq = gp_seq;
pr_alert("%s: Start-test grace-period state: g%ld f%#x\n",
cur_ops->name, (long)gp_seq, flags);
/* Set up the freelist. */