compute_effective_nodemask(9)

💅 compute_effective_nodemask(9) 💅

okay so bestie, welcome to the page for compute_effective_nodemask(9) from the Kernel API Manual — yes, we’re doing cpuset nodemask lore today and it’s lowkey iconic. ✨

🌸 NAME 🌸

compute_effective_nodemask — compute the effective nodemask of the cpuset. That’s the name, that’s the mission, no cap. 💖

✨ SYNOPSIS ✨

Here’s the exact signature, bestie — don’t let the line break scare you:

void compute_effective_nodemask (nodemask_t *new_mems , struct cpuset
*cs , struct cpuset *parent );

🫶 ARGUMENTS 🫶

• new_mems — the temp variable for the new effective_mems mask. It’s where the new mask goes to hang out. 💅
• cs — the cpuset that needs to recompute the new effective_mems mask. Main character cpuset energy. 👑
• parent — the parent cpuset. Yep, the parent. Family tree tea. 🌳

💖 DESCRIPTION 💖

For v2: if nodemask is empty, the parent’s effective_mems is inherited. That’s the whole rule — when the nodemask is empty, inherited parent effective_mems is the vibe. 🫖✨

👀 SEE ALSO 👀

Kernel file: ./kernel/cgroup/cpuset.c — that’s the spot. The whole cpuset crew is here:

• 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)
• 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)
• 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)

source/version: ./kernel/cgroup • date: October 2026 — mwah, bestie, go recompute those nodemasks 💅💖