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
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