css_task_iter_start(9)

💅 css_task_iter_start(9) — Kernel API Manual ✨

Ok bestie, welcome to the Kernel API Manual corner of the group chat 💖. This is the page for css_task_iter_start, and yes, it's giving “start the task walk” energy. No cap.

💖 NAME 💖

css_task_iter_start — initiate task iteration 🎀

✨ SYNOPSIS ✨

void css_task_iter_start (struct cgroup_subsys_state *css , unsigned int
       flags , struct css_task_iter *it );

🎀 ARGUMENTS 🎀

• css — the css whose tasks you're walking, bestie 💅
• flags — the CSS_TASK_ITER_* flags, literally those ones ✨
• it — the task iterator you're gonna use 🫶

🦋 DESCRIPTION 🦋

So like, this function initiates iteration through the tasks of css 👑. The caller can call css_task_iter_next to walk through the tasks until the function returns NULL — yes, NULL is the “we're done here” moment 💀.

On completion of iteration, css_task_iter_end must be called. Do not skip this step, bestie, it's not a vibe to leave it hanging 😭.

🌈 SEE ALSO 🌈

Kernel file ./kernel/cgroup/cgroup.c, plus the whole cgroup bestie lineup: 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_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_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).

Cute sign-off time 🎀: source/version ./kernel/cgroup, date October 2026, page css_task_iter_start(9) — slay, you made it to the end 💖✨