Hello, Michael. On Tue, Dec 20, 2011 at 09:09:08PM +0200, Michael S. Tsirkin wrote: > Another question, wanted to make sure: > virtnet_poll does schedule_delayed_work(&vi->refill, 0); > separately refill work itself also does > schedule_delayed_work(&vi->refill, HZ/2); > If two such events happen twice, on different CPUs, we are still guaranteed > the work will only run once, right?
No, it's not. Normal workqueues only guarantee non-reentrance on local CPU. If you want to guarantee that only one instance of a given item is executing across all CPUs, you need to use the nrt workqueue. Thanks. -- tejun _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
