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scx_layered: keep_running must account for local-DSQ-dispatched tasks #3709

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ByteLab-David wants to merge 2 commits into from
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scx_layered: keep_running must account for local-DSQ-dispatched tasks #3709

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4fdd7bc
scx_layered: keep_running must account for local-DSQ-dispatched tasks
Jul 11, 2026
8a3d57b
Merge branch 'main' into upstream/layered-keep-running-pcpu-kthread
htejun Jul 17, 2026
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8 changes: 8 additions & 0 deletions scheds/rust/scx_layered/src/bpf/main.bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2293,6 +2293,14 @@ static bool keep_running(struct cpu_ctx *cpuc, struct task_struct *p,
if (scx_bpf_dsq_nr_queued(cpuc->hi_fb_dsq_id))
goto no;

/*
* Anything already dispatched to this CPU's local DSQ should run.
* Consider for example pcpu kthreads that are dispatched to the local
* DSQ and which won't be detected by antistall.
*/
if (scx_bpf_dsq_nr_queued(SCX_DSQ_LOCAL_ON | cpuc->cpu))
goto no;

/* @p has fully consumed its slice and still wants to run */
cpuc->ran_current_for += layer->slice_ns;

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