Commit 96af8669 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 9d1914d3

kernel/rcu/refperf.c

+5 −12
Original line number Diff line number Diff line
@@ -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;