Commit 08a7a2ec authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcutorture: Vary forward-progress test interval 



Some of the Linux kernel's RCU implementations provide several mechanisms
to promote forward progress that operate over different timeframes.
This commit therefore causes rcu_torture_fwd_prog() to vary the duration
of its forward-progress testing in order to test each such mechanism.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 152f4afb

kernel/rcu/rcutorture.c

+6 −1
Original line number Diff line number Diff line
@@ -1676,16 +1676,21 @@ static int rcu_torture_fwd_prog(void *args) 
	unsigned long cver;

	unsigned long gps;

	int idx;

	int sd;

	int sd4;

	unsigned long stopat;

	bool tested = false;

	int tested_tries = 0;

	static DEFINE_TORTURE_RANDOM(trs);



	VERBOSE_TOROUT_STRING("rcu_torture_fwd_progress task started");

	do {

		schedule_timeout_interruptible(fwd_progress_holdoff * HZ);

		cver = READ_ONCE(rcu_torture_current_version);

		gps = cur_ops->get_gp_seq();

		stopat = jiffies + cur_ops->stall_dur() / fwd_progress_div;

		sd = cur_ops->stall_dur() + 1;

		sd4 = (sd + fwd_progress_div - 1) / fwd_progress_div;

		stopat = jiffies + sd4 + torture_random(&trs) % (sd - sd4);

		while (time_before(jiffies, stopat) && !torture_must_stop()) {

			idx = cur_ops->readlock();

			udelay(10);