enable_controllers(9)

💅 enable_controllers — the kernel API manual, bestie edition

okay so real talk, this page is from the Kernel API Manual, and it's about enable_controllers(9) — yes that's the whole title, she's a section 9 girlie, deal with it 💖

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✨ NAME ✨

enable_controllers — literally just turns on cgroup v2 controllers. that's the whole personality. no cap 🎀

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🌸 SYNOPSIS 🌸

int enable_controllers (const char *relative_path , const char *controllers );

like, two strings in, one int out. we love a simple signature 🦋

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🫶 ARGUMENTS 🫶

• relative_path — the cgroup path, but make it relative to the workdir, bestie. don't come at her with absolute paths, she's not that kind of function 🙈
• controllers — the list of controllers you wanna enable, and it's got to be in cgroup.controllers format. format matters, iykyk ✨

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💜 DESCRIPTION 💜

so what she does is: she enables the cgroup v2 controllers you asked for. the vibe check here is that if controllers is NULL, she doesn't pick and choose — she enables all the available controllers. main character energy, honestly. 👑

and if it works out? if the slay is successful? she returns 0. that's it. that's the whole return. a clean little 0. periodt 💅

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🌈 SEE ALSO 🌈

the whole friend group, fr fr — go read these too:

• Kernel file ./tools/testing/selftests/bpf/cgroup_helpers.c — the source file herself, iconic
• write_cgroup_file(9)
• write_cgroup_file_parent(9)
• setup_cgroup_environment(9)
• join_cgroup(9)
• join_root_cgroup(9)
• join_parent_cgroup(9)
• set_cgroup_xattr(9)
• __cleanup_cgroup_environment(9)
• cleanup_cgroup_environment(9)
• get_root_cgroup(9)
• create_and_get_cgroup(9)
• get_cgroup_id_from_path(9)
• setup_classid_environment(9)
• set_classid(9)
• join_classid(9)
• cleanup_classid_environment(9)
• get_classid_cgroup_id(9)
• get_cgroup1_hierarchy_id(9)
• open_classid(9)

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🍓 reminder bestie: this is enable_controllers in section 9, so it's kernel API territory — not your normal userland command. know the difference, it's giving competence 💀

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okay that's the page!! sourced straight from ./tools/testing/selftests/bpf, dated October 2026, and logged under enable_controllers(9) forever and always. love that for us 🧚‍♀️✨🌸