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scx_layered: Implement monitor #842

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hodgesds opened this issue Oct 23, 2024 · 0 comments
Open

scx_layered: Implement monitor #842

hodgesds opened this issue Oct 23, 2024 · 0 comments
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bpf good first issue Good for newcomers help wanted Extra attention is needed scx_layered

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@hodgesds
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hodgesds commented Oct 23, 2024 •
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After #841 lands the layered monitor should be implemented. Some ideas for what the monitor should do are:

  • Implement a global stat that indicates if the scheduler is in a degraded state. Figure out a good hueristic for what a degraded state is. Ideally, the state would still be collected before/if the scheduler gets kicked to help know if the scheduler is in a bad state.
  • Add a trace log if DSQs are backlogged by checking the results of scx_bpf_dsq_nr_queued for DSQs.

Other interesting ideas:

  • If a layer is backlogged apply a temporary performance boost using scx_bpf_cpuperf_set.
@hodgesds hodgesds added good first issue Good for newcomers help wanted Extra attention is needed bpf scx_layered labels Oct 23, 2024
@hodgesds hodgesds changed the title scx_layered: Implement watchdog scx_layered: Implement monitor Oct 24, 2024
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