Yuanyuan ZhouUIUC-CS Challenges and Opportunities for OS in the Multi-Core Era Yuanyuan (YY) Zhou University of Illinois at Urbana-Champaign

Yuanyuan Zhou UIUC-CS Real Life Analogy OS--- Parent Core --- Kid People say  Going from one kid to two is a quality change for the parent, not just a quantity change  And so is multi-core for OS!

Yuanyuan Zhou UIUC-CS Challenges “Toy” competition & sharing  How to allocate resources (L2 cache?)  How to improve resource utilization Scalability --- how to handle 100 kids?  How to avoid become the bottleneck  How to improve the parallelism of OS (use TMM for OS?) Scheduling  Memory and IO become a bottleneck  Maybe memory-centric scheduling?

Yuanyuan Zhou UIUC-CS Opportunities “Task offloading”  Offloading tasks to idle cores  Example: Have CPU resources to analyze patterns to make better decision Run the hyper-visor on a different core “Peer-pressure” & “tattletale”  Use idle cores to monitor execution on the other cores for security and reliability “Backup solution”  When one core fails, some other core can take over  Run critical applications on two cores redundantly