rcutorture: Vary forward-progress test interval (08a7a2ec) · Commits · 戴 / test

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:

Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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);

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