Re: [PATCH] kthread_should_stop_check_freeze (was: Re: [PATCH -mm 3/7] Freezer: Remove PF_NOFREEZE from rcutorture thread)

From: Paul E. McKenney
Date: Sat Mar 17 2007 - 15:30:16 EST


On Mon, Mar 12, 2007 at 11:39:06PM +0100, Pavel Machek wrote:
> Hi!
>
> > > > Looks good to me! The other kthread_should_stop() calls in
> > > > rcutorture.c should also become
> > > > kthread_should_top_check_freeze().
>
> > > Why is it useful?
> >
> > Because we want to avoid repeating
> >
> > while (!kthread_should_stop()) {
> > try_to_freeze();
> > ...
> > }
> >
> > in many places?
>
> Do not do it, then. Confusion it causes is not worth saving one line
> of code.
>
> You do less typing, but the resulting code is _less_ readable, not
> more.
>
> NAK.

Another problem is people doing "kthread_should_stop()" and forgetting
about freezing. Then we continue ending up with situations where we are
intermittently unable to freeze. In the spirit of "Rusty Scale" interface
design, how do we make it difficult for people to misuse this interface?

Thanx, Paul
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/