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rcutorture: Consolidate rcu_torture_boost() timing and statistics 

This commit consolidates two loops in rcu_torture_boost(), one of which
counts the number of boost-test episodes and the other of which computes
the start time of the next episode, into one loop that does both with but
a single acquisition of boost_mutex.  This means that the count of the
number of boost-test episodes is incremented after an episode completes
rather than before it starts, but it also avoids the over-counting that
was possible previously.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-04-07 20:00:00 -07:00
parent 7b9dad7aba
commit 8c7ec02e2a
1 changed files with 4 additions and 10 deletions
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14
kernel/rcu/rcutorture.c
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@ -956,15 +956,6 @@ static int rcu_torture_boost(void *arg)
bool failed = false; // Test failed already in this test interval
bool gp_initiated = false;
/* Increment n_rcu_torture_boosts once per boost-test */
while (!kthread_should_stop()) {
if (mutex_trylock(&boost_mutex)) {
n_rcu_torture_boosts++;
mutex_unlock(&boost_mutex);
break;
}
schedule_timeout_uninterruptible(1);
}
if (kthread_should_stop())
goto checkwait;
@ -1015,7 +1006,10 @@ static int rcu_torture_boost(void *arg)
*/
while (oldstarttime == boost_starttime && !kthread_should_stop()) {
if (mutex_trylock(&boost_mutex)) {
boost_starttime = jiffies + test_boost_interval * HZ;
if (oldstarttime == boost_starttime) {
boost_starttime = jiffies + test_boost_interval * HZ;
n_rcu_torture_boosts++;
}
mutex_unlock(&boost_mutex);
break;
}