update_exclusive_cpumask(9)

💅✨ update_exclusive_cpumask(9) — Kernel API Manual, section 9 ✨💅

hey bestie!! welcome to the man page for update_exclusive_cpumask — it's giving kernel energy and honestly it's kind of iconic. okay so let's get into it, no cap 💖

🌸 NAME 🌸

update the exclusive_cpus mask of a cpuset — like, it literally does what it says on the tin 🎀

✨ SYNOPSIS ✨

int update_exclusive_cpumask (struct cpuset *cs , struct cpuset *trialcs
       , const char *buf );

🦋 ARGUMENTS 🦋

• cs — the cpuset you're looking at, like the main character of this operation 👑
• trialcs — a trial cpuset (yes, it's trying things out, we love a test run 🧪)
• buf — a buffer full of cpu numbers that got written to this cpuset, cute!

💜 DESCRIPTION 💜

okay so here's the tea: if cs is a valid partition root (iykyk), then the tasks' cpumask gets updated. that's it, that's the whole vibe check ✅. no cap, that's literally what it does.

🔥 SEE ALSO 🔥

• the kernel file is ./kernel/cgroup/cpuset.c
• 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)
• update_sibling_cpumasks(9)
• validate_partition(9)
• partition_cpus_change(9)
• update_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)

so yeah, that's the whole page! this was from the Kernel API Manual, section 9, and the source/version is ./kernel/cgroup from October 2026. catch you on the flip side, bestie! 💕✨🎀