update_sibling_cpumasks(9)

✨ update_sibling_cpumasks(9) ✨

okay so real talk — this is a Kernel API Manual page, like the actual update_sibling_cpumasks(9) one, and I'm gonna walk you through it bestie because honestly it's short and sweet and you're gonna eat 💅

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🌸 NAME 🌸

update_sibling_cpumasks — literally just updates the sibling cpusets' cpumasks. that's the whole vibe. no cap. 🦋

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🎀 SYNOPSIS 🎀

here's the signature, copy it exactly pls, don't be weird about the spaces:

void update_sibling_cpumasks (struct cpuset *parent , struct cpuset *cs
, struct tmpmasks *tmp );

like, void return — nothing comes back, this function is a generous icon who gives and doesn't take 👑

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⭐ ARGUMENTS ⭐

three parameters, three little besties, let's meet them:

• parent — the parent cpuset. the mothership. the one in charge 🫶
• cs — the current cpuset, aka the one we're actually looking at right now. main character energy fr 🌈
• tmp — temp variables. scratch space. the messy little side quest that makes the whole thing work 😭

that's it. that's the whole argument list. no hidden flags, no secret options, no environment variables lurking in the shadows. we love a low-drama API 💖

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👑 SEE ALSO 👑

okay this is the part where it gets LONG, because the cpuset crew is huge and everybody knows everybody. all of these live in the kernel file ./kernel/cgroup/cpuset.c — say hi to the whole family:

• cpuset_lock(9)
• cpuset_full_lock(9)
• partition_is_populated(9)
• alloc_cpumasks(9)
• alloc_tmpmasks(9)
• free_tmpmasks(9)
• dup_or_alloc_cpuset(9)
• free_cpuset(9)
• cpus_excl_conflict(9)
• cpuset_update_tasks_cpumask(9)
• compute_effective_cpumask(9)
• compute_effective_nodemask(9)
• rm_siblings_excl_cpus(9)
• update_parent_effective_cpumask(9)
• compute_partition_effective_cpumask(9)
• validate_partition(9)
• partition_cpus_change(9)
• update_cpumask(9)
• update_exclusive_cpumask(9)
• cpuset_update_tasks_nodemask(9)
• update_prstate(9)
• cpuset_css_alloc(9)
• cpuset_init(9)
• cpuset_hotplug_update_tasks(9)
• cpuset_handle_hotplug(9)
• cpuset_init_smp(9)
• cpuset_cpus_allowed_locked(9)
• cpuset_cpus_allowed(9)
• cpuset_cpus_allowed_fallback(9)
• cpuset_mems_allowed(9)
• cpuset_nodemask_valid_mems_allowed(9)
• cpuset_nodes_allowed(9)
• cpuset_spread_node(9)
• cpuset_mem_spread_node(9)
• cpuset_mems_allowed_intersects(9)
• cpuset_print_current_mems_allowed(9)

like. that's thirty-six whole friends. the cpuset subsystem is not beating the "has a big friend group" allegations 😭💀

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just a lil reminder bestie: this page gives you the signature and the gang, not the internals. if you need to know what actually happens inside, go read ./kernel/cgroup/cpuset.c — i'm not out here making stuff up 💅

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aaaand that's the page!! 🎀 this gem comes from the source directory ./kernel/cgroup, dated October 2026, and it's the update_sibling_cpumasks(9) page, obviously. go forth and update those siblings, queen — you've got this 💖✨🦋