• Felipe Cerqueira's avatar
    Major Commit: Suspension-aware Scheduling · 3f39fe20
    Felipe Cerqueira authored
    1) Definition of a generic model for job suspensions based on
       received service (e.g., job j_1 should suspend for 4ms as
       soon as service reaches 5ms).
    2) Definition of the dynamic suspension model (i.e., cumulative
       suspension of job j_1 <= X).
    3) Analysis of suspension-aware scheduling by inflation of job
       costs (via schedule reduction). In the literature, this is
       called suspension-oblivious analysis.
    4) Analysis of suspension-aware scheduling by adjusting job
       jitter (via schedule reduction).
    5) Proof of (weak) sustainability of job costs under suspension-aware
       scheduling. We show that if we increase the costs of all jobs while
       reducing their suspension times in a certain way, the response times
       of all jobs do not decrease.
       This has an important implication regarding worst-case schedules: if
       some schedulability analysis already accounts for the fact that job
       suspension times can vary from 0 to the task suspension bound, then
       it's perfectly safe to assume that jobs execute for their WCET.
    6) Proof of sustainability of the cost of a single job under
       suspension-aware scheduling. That is, we show that increasing the
       cost of a single job does not reduce its own response time.
       (Note that this is a very basic result that applies to many
       work-conserving, JLFP schedulers. We don't claim anything about
       the response time of other jobs.)
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