i#5843 scheduler: Accumulate quanta across runs #6502
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Changes the quanta accounting to match the real kernel by accumulating it across executions if a prior execution was terminated early due to a voluntary context switch. Adds new testing, and updates old tests with the behavior change. Scheduler unit test string changes were carefully vetted. E.g., for test_synthetic_with_syscalls_multiple(): the output strings changed because H's quantum accumulates and it hits a preempt in the middle of its second HH sequence, which decrements B's quantum, causing B to become available sooner. Issue: #5843
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a64 had some weird seemingly unrelated failures but the machine turned out to be out of disk space (discovered in the middle of this re-run). |
abhinav92003
approved these changes
Dec 12, 2023
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Changes the quanta accounting to match the real kernel by accumulating it across executions if a prior execution was terminated early due to a voluntary context switch.
Adds new testing, and updates old tests with the behavior change. Scheduler unit test string changes were carefully vetted. E.g., for test_synthetic_with_syscalls_multiple(): the output strings changed because H's quantum accumulates and it hits a preempt in the middle of its second HH sequence, which decrements B's quantum, causing B to become available sooner.
Issue: #5843