sched_group_asym(9)

✨ sched_group_asym(9) ✨

okay so this is a page from the Kernel API Manual, bestie — it's sched_group_asym, and it's literally the little function that decides whether a CPU is fancy enough to do asym_packing balancing. sit down, hydrate, let's get into it 🫶

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💖 NAME 💖

sched_group_asym — check if the destination CPU can do asym_packing balance ✨

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🎀 SYNOPSIS 🎀

bool sched_group_asym (struct lb_env *env , struct sg_lb_stats *sgs ,
struct sched_group *group );

like, it takes three things and gives you back a bool. that's the whole vibe 💅

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🌸 ARGUMENTS 🌸

• env — the load balancing environment, aka the whole situation she's operating in 🌀
• sgs — load-balancing statistics of the candidate busiest group (receipts! numbers! data!) 📊
• group — the candidate busiest group, the one we're side-eyeing 👀

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🦋 DESCRIPTION 🦋

so here's the tea: env::dst_cpu can do asym_packing if it has higher priority than the preferred CPU of group 🏆

that's it, that's the whole check. no cap. she literally just looks at who's got the higher priority and goes from there ✨

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🌈 RETURN 🌈

• true — if env::dst_cpu can do with asym_packing load balance 🎉 slay
• False — otherwise 🙈 (yes, the manpage capitalises it like that, and honestly? iconic)

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👑 SEE ALSO 👑

kernel file ./kernel/sched/fair.c — and like, a whole friend group of functions that hang out together:

• update_tg_load_avg(9)
• update_cfs_rq_load_avg(9)
• attach_entity_load_avg(9)
• detach_entity_load_avg(9)
• cpu_util(9)
• sched_use_asym_prio(9)
• update_sg_lb_stats(9)
• update_sd_pick_busiest(9)
• idle_cpu_without(9)
• update_sd_lb_stats(9)
• calculate_imbalance(9)
• sched_balance_find_src_group(9)

fr fr go read those too, they're all in the same friend group and the lore is deep 🧚

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and that's the page!! mwah 💋 this one came out of ./kernel/sched, dated October 2026 — so yeah, she's from the future, main character energy only ⭐💜