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refperf: Simplify initialization-time wakeup protocol 

This commit moves the reader-launch wait loop from ref_perf_init()
to main_func(), removing one layer of wakeup and allowing slightly
faster system boot.

Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-05-27 16:46:56 -07:00
parent 9d1914d34c
commit 96af866959
1 changed files with 5 additions and 12 deletions
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17
kernel/rcu/refperf.c
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@ -369,13 +369,14 @@ static int main_func(void *arg)
VERBOSE_PERFOUT_ERRSTRING("out of memory");
errexit = true;
}
atomic_inc(&n_init);
// Wait for all threads to start.
wait_event(main_wq, atomic_read(&n_init) == (nreaders + 1));
if (holdoff)
schedule_timeout_interruptible(holdoff * HZ);
// Wait for all threads to start.
atomic_inc(&n_init);
while (atomic_read(&n_init) < nreaders + 1)
schedule_timeout_uninterruptible(1);
// Start exp readers up per experiment
for (exp = 0; exp < nruns && !torture_must_stop(); exp++) {
if (errexit)
@ -565,14 +566,6 @@ ref_perf_init(void)
firsterr = torture_create_kthread(main_func, NULL, main_task);
if (firsterr)
goto unwind;
schedule_timeout_uninterruptible(1);
// Wait until all threads start
while (atomic_read(&n_init) < nreaders + 1)
schedule_timeout_uninterruptible(1);
wake_up(&main_wq);
torture_init_end();
return 0;