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Fig 1

Fig 1. Multimedia tasks (processes or threads). performance requirements (via system calls). monitoring. scheduling. SRT Scheduler. demand distribution. Profiler. time allocation. GRACE-OS. Speed Adaptor. speed scaling. CPU. Fig 2. j th job. ( j+ 1) th job. out. in.

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Fig 1

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  1. Fig 1 Multimedia tasks (processes or threads) performance requirements (via system calls) monitoring scheduling SRT Scheduler demand distribution Profiler time allocation GRACE-OS Speed Adaptor speed scaling CPU

  2. Fig 2 jth job (j+1)th job out in finish/out in finish/out in out in out in c1 c2 c3 c4 c5 c7 c8 c9 c10 c6 cycles cycles for jth job = (c2 – c1) + (c4 – c3) cycles for (j+1)th job = (c6 – c5) + (c8 – c7) + (c10 – c9) legend in profiled task is switched in for execution out profiled task is switched out for suspension finish profiled task finishes a job

  3. b1 b2 Fig 3 1 cumulative distribution function F(x) cumulative probability Cmin=b0 br=Cmax br-1 cycle demand

  4. b1 b2 Fig 4 statistical performance requirement 1 p cumulative probability Cmin=b0 br=Cmax bm cycle demand cycle allocation C

  5. Fig 5 cycle: speed: 0 100 MHz 1 x 106 120 MHz 2 x 106 180 MHz 3 x 106 300 MHz (a) Speed schedule with four scaling points 120 speed (MHz) 100 job1's cycles=1.6x10 6 time (ms) 10 15 180 120 speed (MHz) 100 job2's cycles = 2.5 x 10 6 time (ms) 10 18.3 21.1 300 speed (MHz) 180 120 100 job3's cycles = 3.9 x 10 6 time (ms) 10 18.3 23.8 26.8 (b) Speed scaling for three jobs using speed schedule in (a)

  6. SRT tasks (processes or threads) • Instrumented with SRT APIs user level kernel level system calls process control block standard Linux scheduler • SRT-DVS modules • Soft real-time scheduling • PowerNow speed scaling hook Fig 6

  7. process control block • SRT flag • cycle counter • cycle budget • speed schedule • current point • other attributes … scaling point (cycle, speed) (cycle, speed) speed increase … (cycle, speed) Fig 7

  8. fig 8

  9. fig 9

  10. Table 4 (DVS overhead)

  11. Fig 10-a

  12. Fig 10-b

  13. Fig 11-a

  14. Fig 11-b

  15. Fig 11-c

  16. Fig 11-d

  17. Table 6

  18. Table 9-10

  19. Fig 12

  20. Fig 13

  21. Fig 14

  22. Eq 6-7 Eq 8-10

  23. Eq 11-12 Eq 13

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