update_sd_pick_busiest(9)

💅 update_sd_pick_busiest(9) — the Kernel API Manual, bestie edition 🎀

Okay so real talk, this is a page from the Kernel API Manual and it's all about update_sd_pick_busiest(9) — a little function in the scheduler's load balancer that's basically the "are you the busiest one here?" vibe check. It's short, it's sweet, it slays. Let's go ✨

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✨ NAME ✨

update_sd_pick_busiest — returns 1 when the group is the busiest one 🏆

🌸 SYNOPSIS 🌸

bool update_sd_pick_busiest (struct lb_env *env , struct sd_lb_stats
*sds , struct sched_group *sg , struct sg_lb_stats *sgs );

🦋 ARGUMENTS 🦋

• env — the load balancing environment. Like, the whole setup it's operating in 💖
• sds — the sched_domain statistics 📊
• sg — the sched_group candidate that's getting checked to see if it's the busiest one 👀
• sgs — the sched_group statistics 🧮

💜 DESCRIPTION 💜

So what it does is: it figures out whether sg is a busier group than the busiest group that was already picked before. That's it. That's the whole function. Iconic behavior, honestly 🫶

🔥 RETURN 🔥

• true — if sg is a busier group than the previously selected busiest group 👑
• false — otherwise 💀

Not me stressing over the return value — it's literally just true or false, bestie, you got this 🍓

🌈 SEE ALSO 🌈

Kernel file ./kernel/sched/fair.c plus all these lil friends:

• 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)
• sched_group_asym(9)
• update_sg_lb_stats(9)
• idle_cpu_without(9)
• update_sd_lb_stats(9)
• calculate_imbalance(9)
• sched_balance_find_src_group(9)

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And that's the whole page, bestie — mwah 💋 Signing off from ./kernel/sched, dated October 2026, for update_sd_pick_busiest(9). Go forth and balance those loads, no cap 🧚‍♀️✨