On Mon, 2009-11-23 at 16:06 +0200, Gleb Natapov wrote: > Do not preempt kernel. Just maintain counter to know if task can be rescheduled. > Asynchronous page fault may be delivered while spinlock is held or current > process can't be preempted for other reasons. KVM uses preempt_count() to check if preemptions is allowed and schedule other process if possible. This works > with preemptable kernels since they maintain accurate information about > preemptability in preempt_count. This patch make non-preemptable kernel > maintain accurate information in preempt_count too. I'm thinking you're going to have to convince some people this won't slow them down for no good. Personally I always have PREEMPT=y, but other people seem to feel strongly about not doing so. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
