__cgroup_task_count(9)

💖 __cgroup_task_count(9) — Kernel API Manual, bestie edition 💖

okay so this is the Kernel API Manual page for __cgroup_task_count(9), and it’s giving “tiny function, very serious lock responsibility” energy. ✨

🌸 NAME 🌸

__cgroup_task_count — count the number of tasks in a cgroup. The caller is responsible for taking the css_set_lock.

🫶 bestie, this lock note is the whole vibe: the caller is responsible for taking the css_set_lock. That part is not decorative.

🎀 SYNOPSIS 🎀

int __cgroup_task_count (const struct cgroup *cgrp );

💬 ARGUMENTS 💬

• cgrp — the cgroup in question. Literally the cgroup we’re asking about, no cap.

🦋 SEE ALSO 🦋

Kernel file: ./kernel/cgroup/cgroup.c

the whole related-function group chat is right here:

cgroup_ssid_enabled(9), cgroup_on_dfl(9), cgroup_e_css_by_mask(9),
cgroup_e_css(9), cgroup_get_e_css(9), cgroup_task_count(9), for_each_css(9),
do_each_subsys_mask(9), css_set_populated(9), css_update_populated(9),
css_set_update_populated(9), css_set_move_task(9), compare_css_sets(9),
find_existing_css_set(9), allocate_cgrp_cset_links(9), link_css_set(9),
find_css_set(9), cgroup_file_mode(9), cgroup_calc_subtree_ss_mask(9),
cgroup_kn_unlock(9), cgroup_kn_lock_live(9), css_clear_dir(9),
css_populate_dir(9), cgroup_attach_lock(9), cgroup_attach_unlock(9),
cgroup_migrate_add_task(9), cgroup_taskset_first(9),
cgroup_taskset_next(9), cgroup_migrate_execute(9),
cgroup_migrate_vet_dst(9), cgroup_migrate_finish(9),
cgroup_migrate_add_src(9), cgroup_migrate_prepare_dst(9),
cgroup_migrate(9), cgroup_attach_task(9), cgroup_update_dfl_csses(9),
cgroup_lock_and_drain_offline(9), cgroup_save_control(9),
cgroup_propagate_control(9), cgroup_restore_control(9),
cgroup_apply_control_enable(9), cgroup_apply_control_disable(9),
cgroup_apply_control(9), cgroup_finalize_control(9),
cgroup_enable_threaded(9), cgroup_tryget_css(9), cgroup_addrm_files(9),
cgroup_rm_cftypes(9), cgroup_add_cftypes(9), cgroup_add_dfl_cftypes(9),
cgroup_add_legacy_cftypes(9), cgroup_file_notify(9),
cgroup_file_show(9), css_next_child(9), css_next_descendant_pre(9),
css_rightmost_descendant(9), css_next_descendant_post(9),
css_has_online_children(9), css_task_iter_advance_css_set(9),
css_task_iter_start(9), css_task_iter_next(9), css_task_iter_end(9),
css_create(9), kill_css_sync(9), kill_css_finish(9),
cgroup_destroy_locked(9), cgroup_init_early(9), cgroup_init(9),
cgroup_fork(9), cgroup_v1v2_get_from_file(9), cgroup_get_from_file(9),
cgroup_css_set_fork(9), cgroup_css_set_put_fork(9), cgroup_can_fork(9),
cgroup_cancel_fork(9), cgroup_post_fork(9), cgroup_task_exit(9),
css_tryget_online_from_dir(9), css_from_id(9), cgroup_get_from_path(9),
cgroup_v1v2_get_from_fd(9), cgroup_get_from_fd(9), cgroup_parse_float(9)

mwah 💋 source ./kernel/cgroup, October 2026 — __cgroup_task_count(9) said what she said and left. 🎀