Re: [RFC PATCH -rt 2/2] RCU priority boosting additions to rcutorture

[Nigel Cunningham <nigel@nigel.suspend2.net>]

Hi Paul.

On Wed, 2007-01-31 at 18:31 -0800, Paul E. McKenney wrote:
> Good to hear from you, Nigel!

Thanks :)

> Should indeed be OK to freeze during suspend/hibernate.  Will my
> schedule_timeout_interruptible() be sufficient to allow the freeze
> to happen, or do I need to add an explicit try_to_freeze()?

You need a try_to_freeze() - the process has to enter the refrigerator()
function to be counted as frozen.

> Ah, and I probably need to use the same trick that mtd_blktrans_thread()
> does to avoid having all my sleeps killed of by an errant signal:
> 
> 	spin_lock_irq(&current->sighand->siglock);
> 	sigfillset(&current->blocked);
> 	recalc_sigpending();
> 	spin_unlock_irq(&current->sighand->siglock);
> 
> Or is such paranoia unnecessary?

Yeah. try_to_freeze() is a function now, so you can do something if
(try_to_freeze()) goto sleep_again if you so desire.

Regards,

Nigel