On 12/17/2010 02:15 AM, Mike Galbraith wrote:
BTW, with this vruntime donation thingy, what prevents a task from forking off accomplices who do nothing but wait for a wakeup and yield_to(exploit)? Even swapping vruntimes in the same cfs_rq is dangerous as hell, because one party is going backward.
I just realized the answer to this question. We only give cpu time to tasks that are runnable, but not currently running. That ensures one task cannot block others from running by having time yielded to it constantly. -- 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
