On Tuesday 13 November 2007, Nick Piggin wrote: > > All this does is prevent constant and needless checking for > > "do you want to preempt me now?" "now?" "now?" in "now?" the > > middle "now?" of "now?" i/o "now?" loops. > > Actually that's wrong.
Certainly it's right for the mainstream kernel. Dropping a lock (other than a raw spinlock) does that checking; when a loop needs to acquire then drop such a lock, that's exactly what's going on. And in the RT kernel, it's got to do the same thing ... because dropping that lock may mean that a higher priority task should immediately run and grab the lock. - 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/
