Hi Paul. On Wed, 2007-01-31 at 17:26 -0800, Paul E. McKenney wrote: > This patch adds an optional preemption kernel thread to the rcutorture > tests. This thread sets itself to a low RT priority and chews up CPU > in 10-second bursts, verifying that grace periods progress during this > 10-second interval. Passes RCU torture testing on a 4-CPU (a pair of > 2-CPU dies) 64-bit Xeon system.
[...] > Signed-off-by: Paul E. McKenney <[EMAIL PROTECTED]> > +static int rcu_torture_preempt(void *arg) > +{ > + int completedstart; > + int err; > + time_t gcstart; > + struct sched_param sp; > + > + sp.sched_priority = MAX_RT_PRIO - 1; > + err = sched_setscheduler(current, SCHED_RR, &sp); > + if (err != 0) > + printk(KERN_ALERT "rcu_torture_preempt() priority err: %d\n", > + err); > + current->flags |= PF_NOFREEZE; > + > + do { > + completedstart = rcu_torture_completed(); > + gcstart = xtime.tv_sec; > + while ((xtime.tv_sec - gcstart < 10) && > + (rcu_torture_completed() == completedstart)) > + cond_resched(); > + if (rcu_torture_completed() == completedstart) > + rcu_torture_preempt_errors++; > + schedule_timeout_interruptible(HZ); > + } while (!kthread_should_stop()); > + return 0; > +} Does it need to be NOFREEZE? I would think that it should be frozen during a suspend/hibernate. Regards, Nigel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/