• Resource management/リソース管理
  • Synchronization: correctness, efficiency, deadlock avoidance
  • Fair and/or appropriate allocation of resources
  • Security
• Extension of the machine/拡張マシン
  • Expand memory through virtual memory
  • Expand non-volatile storage through file systems, volume managers, and network/distributed file systems
• Naming/ネーミング
  Naming is one of the principle functions of all computer systems.
  • Storage: registers, cache, main memory, disk memory, removable devices
  • Hardware: devices, especially dynamic ones (USB, iSCSI, etc.)
  • Virtual objects: processes, pipes
  • Data: URLs, URIs
  • Sharing names
• Data movement/データ転送
  Generally, user programs do not move data directly; they must ask the operating system to do it for them.
  • Moving data: buses, networks
  • Controlling the movement: registers, RPC, third-party transfers, etc.
  • Performance: data layout, resource allocation at multiple levels (e.g., I/O bus and memory bus)
  • Real-time constraints: buffering, jitter, missed revolutions, tape stalls