cgroup_apply_control_enable(9)

💅 cgroup_apply_control_enable(9) 💅

okay so bestie, welcome to the Kernel API Manual — this is the page for cgroup_apply_control_enable, and yes the name is a mouthful but we're gonna slay it together 🫶

---

✨ NAME ✨

cgroup_apply_control_enable — turn on or show the csses according to control, no cap 💅

---

🎀 SYNOPSIS 🎀

int cgroup_apply_control_enable (struct cgroup *cgrp );

like, that's the whole signature, she's short and iconic 👑

---

🌸 ARGUMENTS 🌸

• cgrp — the root of the target subtree. that's it. that's the vibe. she's the main character here 💖

---

🦋 DESCRIPTION 🦋

so what she does is: walk cgrp's subtree and either create new csses or make the existing ones visible. literally strolling through the tree like it's a group chat, making sure everyone's present and seen ✨

here's the tea though 🍵 — a css gets created invisible if it's being implicitly enabled through dependency. sneaky! 🙈 but then an invisible css is made visible when the userland explicitly enables it. so it's giving "waiting for the user to actually say something" energy. periodt.

• returns 0 on success 😌
• returns -errno on failure 😭

⚠️ bestie listen to me — on failure, the csses which have been processed already aren't cleaned up. nobody's coming to tidy that for you. the caller is responsible for cleaning up with cgroup_apply_control_disable. that's on you, fr fr 💀

---

🌈 SEE ALSO 🌈

all my girls in one list, the Kernel file ./kernel/cgroup/cgroup.c plus this entire friend group:

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), 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_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)

---

💖 that's the whole page babes 💖

she lives at ./kernel/cgroup, dated October 2026, and she's filed under cgroup_apply_control_enable(9) — mwah, go touch some cgroups, ily 🧚‍♀️🎀