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Merge pull request #956 from hodgesds/layered-optimize-v1

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scx_layered: Remove high fallback dsq budget check
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Daniel Hodges 2024-11-21 20:38:22 +00:00 committed by GitHub
commit 8f89fc6876
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1 changed files with 0 additions and 23 deletions
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scheds/rust/scx_layered/src/bpf/main.bpf.c
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@ -1395,16 +1395,6 @@ void layered_dispatch_no_topo(s32 cpu, struct task_struct *prev)
return;
}
/*
* If one of the fallback DSQs has the most budget then consume from
* it to prevent starvation.
*/
if (has_pref_fallback_budget(costc)) {
dsq_id = budget_id_to_fallback_dsq(costc->pref_budget);
if (scx_bpf_consume(dsq_id))
return;
}
/* consume preempting layers first */
bpf_for(idx, 0, nr_layers) {
layer_idx = rotate_layer_id(costc->pref_layer, idx);
@ -1678,19 +1668,6 @@ void BPF_STRUCT_OPS(layered_dispatch, s32 cpu, struct task_struct *prev)
return;
}
/*
* If one of the fallback DSQs has the most budget then consume from it
* to prevent starvation.
*/
if (has_pref_fallback_budget(costc)) {
dsq_id = budget_id_to_fallback_dsq(costc->pref_budget);
trace("COST consuming fallback %lld", dsq_id);
if (dsq_id > LO_FALLBACK_DSQ)
scx_bpf_error("invalid fallback dsq %lld", dsq_id);
if (scx_bpf_consume(dsq_id))
return;
}
/* consume preempting layers first */
if (consume_preempting(costc, cctx->cache_idx) == 0)
return;