cgroup_migrate_execute(9)

✨ cgroup_migrate_execute ✨

okay bestie, welcome to the Kernel API Manual — this one's a lil kernel-function glow-up and it's honestly kind of a big deal 🎀

💖 NAME 💖

cgroup_migrate_execute — migrate a taskset 🦋

🌸 SYNOPSIS 🌸

int cgroup_migrate_execute (struct cgroup_mgctx *mgctx );

🎀 ARGUMENTS 🎀

• mgctx — the migration context, aka the whole vibe of the move you're about to do ✨

💅 DESCRIPTION 💅

so here's the tea ☕ — cgroup_migrate_execute migrates the tasks in mgctx, exactly as they were set up by the migration preparation functions. like, prep time is over, this is showtime 💃

it fails iff one of the ->can_attach callbacks fails or a CGROUP_TASK_MIGRATING notification fails. and the guarantee? iconic. it guarantees that either all of the tasks in mgctx are migrated or none of them are — all or nothing, no half-finished mess, periodt 👑

oh and one more thing — mgctx is consumed regardless of success. so like… whether it slays or flops, that context is gone, bestie. don't come back looking for it 🙈

🦋 SEE ALSO 🦋

the kernel file ./kernel/cgroup/cgroup.c and literally the 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_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)

and that's the whole page, bestie 💖✨🎀🦋🌸💅🫶 — filed under ./kernel/cgroup, dated October 2026, same as cgroup_migrate_execute(9). go forth and migrate responsibly, ily 😭👑🌈⭐💀🍓🧚💜