Instance Caging is available from Oracle Database 11g Release 2 onwards.
Database Instance Caging: A Simple Approach to Server Consolidation
Instance Caging
Configuring and Monitoring Instance Caging [ID 1362445.1]
CPU count consideration for Oracle Parameter setting when using Hyper-Threading Technology [ID 289870.1]
Instance caging is one of the best ways to allocate resources from a database standpoint. It really takes it one step further from products like the IBM Workload Manager but is far superior.