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scx_layered: Update idle topology selection order

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Update the idle topology selection order, the current logic is:

core architecture (big/little) -> LLC -> NUMA -> Machine

It's probably better to try to keep cache lines clean and do:

LLC -> core architecture (big/little) -> NUMA -> Machine

Signed-off-by: Daniel Hodges <hodges.daniel.scott@gmail.com>
This commit is contained in:
Daniel Hodges 2024-10-07 10:34:11 -07:00
parent 4979cb8762
commit 0b497d6df0
1 changed files with 13 additions and 12 deletions
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25
scheds/rust/scx_layered/src/bpf/main.bpf.c
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@ -705,7 +705,19 @@ s32 pick_idle_cpu(struct task_struct *p, s32 prev_cpu,
}
/*
* If the layer uses BigLittle growth algo try a big cpu first
* Try a CPU in the current LLC
*/
bpf_cpumask_copy(pref_idle_cpumask, idle_cpumask);
bpf_cpumask_and(pref_idle_cpumask, cache_cpumask,
cast_mask(pref_idle_cpumask));
bpf_cpumask_and(pref_idle_cpumask, layer_cpumask,
cast_mask(pref_idle_cpumask));
if ((cpu = pick_idle_cpu_from(cast_mask(pref_idle_cpumask),
prev_cpu, idle_cpumask)) >= 0)
goto out_put;
/*
* If the layer uses BigLittle growth algo try a big cpu
*/
if (has_little_cores
&& big_cpumask
@ -728,17 +740,6 @@ s32 pick_idle_cpu(struct task_struct *p, s32 prev_cpu,
goto out_put;
}
/*
* Try a CPU in the current LLC
*/
bpf_cpumask_copy(pref_idle_cpumask, idle_cpumask);
bpf_cpumask_and(pref_idle_cpumask, cache_cpumask,
cast_mask(pref_idle_cpumask));
bpf_cpumask_and(pref_idle_cpumask, layer_cpumask,
cast_mask(pref_idle_cpumask));
if ((cpu = pick_idle_cpu_from(cast_mask(pref_idle_cpumask),
prev_cpu, idle_cpumask)) >= 0)
goto out_put;
/*
* Next try a CPU in the current node