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Outline

Outline. Models Design of experiments. Current Scheduler. Completely Fair Scheduler(CFS) Since Linux 2.6.23 /kernel/ sched.c Maintain balance (fairness) in providing processor time to tasks. Red-Black Tree. Our Ideas. Base on ready queue length Base on machine learning

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Outline

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  1. Outline • Models • Design of experiments

  2. Current Scheduler • Completely Fair Scheduler(CFS) • Since Linux 2.6.23 • /kernel/sched.c • Maintain balance (fairness) in providing processor time to tasks. • Red-Black Tree

  3. Our Ideas • Base on ready queue length • Base on machine learning • Energy-based model

  4. Assumptions • Core voltage cannot be adjusted to any value, but some pre-defined value. • Level • We know N, the number of tasks waiting in the ready queue. • Each task is only in core for execution during a short period before being swept out and back to ready queue.

  5. Base on Queue Length - 1 • Assume the time slice is fixed. • Higher core V => more cycles => more instructions executed => tasks can finish earlier. • Two methods • For every period of time, if N increases => raise core voltage. • For every period of time, if N doesn’t decreases => raise core voltage.

  6. Base on Queue Length - 2 • Assume the instruction retired is fixed. • Higher core V => more cycles => shorter time in core. • All N tasks should be executed at least once in T. • TmaxV ≦ T ≦ TminV • Adjust core voltageaccording to N. Vhigh Nt= 6+4 = 10 Vlow T

  7. Energy-based • Assume the V×t, energy of each task being executed once is fixed. • Similar to the previous one. • However, V×t is adjusted according to Battery Power Remaining.

  8. Design of Experiment • First we measure the power consumption and benchmark performance using L4Linux predefined strategy. • Vhighest and Vlowest. • Apply our strategies and measure: • Only one benchmark • Multiple benchmarks • Same • Different

  9. Paper Study • An Energy Conservation DVFS Algorithm for the Android Operating System • 2012 • An Energy Conservation DVFS Algorithm for the Android Operating System • 2010 • An Energy Conservation DVFS Algorithm for the Android Operating System • 2005

  10. Discussion

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