On Wed, Feb 15, 2012 at 04:07:49PM +0200, Avi Kivity wrote: > Well, it still has flushes inside the lock. And it seems to be more > complicated, but maybe that's because I thought of my idea and didn't > fully grok yours yet. If we go more complicated I prefer Avi's suggestion to move them all outside the lock. Yesterday I was also thinking at the regular pagetables and how we do not have similar issues there. On the regular pagetables we just do unconditional flush in fork when we make it readonly and KSM (the other place that ptes stuff readonly that later can cow) uses ptep_clear_flush which does an unconditional flush and furthermore it does it inside the PT lock, so generally we don't optimize for those things on the regular pagetables. But then these events don't happen as frequently as they can on KVM without EPT/NPT. -- 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
