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Janos

Janos. Patrick Tullmann Flux Research Group University of Utah. Janos JVM. Extend Java virtual machine Support OS-like processes Fine-grained resource controls Flexible system Run on OSKit == Active Node Run as Unix process == Java OS. Ex: Network Administration. MCI. Attacker.

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Janos

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  1. Janos Patrick Tullmann Flux Research Group University of Utah

  2. Janos JVM • Extend Java virtual machine • Support OS-like processes • Fine-grained resource controls • Flexible system • Run on OSKit == Active Node • Run as Unix process == Java OS

  3. Ex: Network Administration MCI Attacker Victim AT&T

  4. A Current Approach • MCI’s Denial of Service Tracker (DoSTrack) • DoSTrack walks “upstream” following the trail to the attacker • Shortcomings of DoSTrack • Only works in the MCI administrative domain • Requires a Cisco router and Perl5

  5. An Active Network Approach 1. Install extensible system on each router Safe language system 2. Add infrastructure to separate tasks Who & what is executing 3. Add support for hierarchical resource controls Packet Forwarding MCI Other AT & T

  6. Motivation • Java Virtual Machine provides: • Safety • Platform independence • Active Node OS needs: • Multiple “user” management • Resource management • Flexible & extensible control

  7. Approach • Traditional OS a good model • Hardware provides safety mechanism • OS provides management • Fluke OS nested process model

  8. Nested Process Model • Hierarchical • Environment of process controlled by parents • Parent can manage all, few, or no resources of child • Any process can create sub-processes AltaVirtual Machine Untrusted Container Trusted Container Root Task Admin Component

  9. Mapping an OS into Java • Type safety replaces hardware page protections • Bytecodes replace simple instructions • Native methods replace privileged instructions • All higher-level abstractions are equivalent

  10. JavaOS Prototype: Alta • Supports Fluke features for process management • Mimics Fluke structure • Provides parent process with control • No CPU controls • Maintains backwards compatibility • Existing Java apps work (JDK 1.0)

  11. JavaOS Prototype: Alta • Maintains “whole JVM” illusion • Per-process, flexible typespaces • Inter-process sharing • Sharing & resource control

  12. User-level Sharing • Child allocates -> Parent references • Harmless. If parent dies then child dies • Useful. Child can pass IPC arguments • Sibling allocates -> Sibling references • Allowable. Parent trades communication costs for separation • Parent allocates -> Child references • Standard server behavior • Cannot deallocate without child’s cooperation

  13. Alta vs. Fluke • Use similar internal organization • Both implement a “red line” [Back 1999] • Fully preemptible kernel • Alta allows kernel / user data sharing • Performance is weak • Improve Java • Improve structure of Alta

  14. Contributions • Prototype demonstrates applicability of OS abstractions to Java • The Fluke NPM with a different protection mechanism • Multiple application support in a JVM • Type-safe sharing between inconsistent typespaces

  15. Building an Active Node • Expand resource management • CPU Inheritance Scheduling • Network access • Memory management • Shared objects • Garbage collection • Flask security architecture • Java optimizations and improvements

  16. Memory: GC & Sharing • CPU time for GC • Charging for shared objects

  17. Java Optimization • Memory management • Stack allocation • Non-GC processes • Optimized/restricted environments • Java code on the fast-path

  18. Extend to EE • Provide resource controls in ANTS • CPU • Network • Memory • Challenges in applying to ANTS • Per-protocol • Subdivision of resources

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