cgroup_subsys_on_dfl(9)

📦 version 7.3.1, in nixpkgs unstable

✨ cgroup_subsys_on_dfl 💅

okay so bestie, welcome to the Kernel API Manual — yes this is a real kernel manpage and yes it's about cgroups, buckle up 🎀

🌸 NAME 🌸

cgroup_subsys_on_dfl — the fast test on whether a subsys is on the default hierarchy ✨

like, it's literally a quick vibe check for your subsystem's hierarchy status, no cap 🔥

🦋 SYNOPSIS 🦋

cgroup_subsys_on_dfl (ss );

that's it. that's the whole call. she's short and she knows it 💅

🎀 ARGUMENTS 🎀

  • ss — the subsystem in question 👑 this is the one you're asking about, the main character of the whole operation fr fr

🌈 SEE ALSO 🌈

Kernel file ./include/linux/cgroup.h — go read it, it's giving source of truth 📖✨

and then the whole friend group of related functions, all invited to the group chat 🫶:

bestie moment: this is a kernel-internal thing, so if you're out here calling it from userspace you're doing too much 🙈 keep it in the kernel where it belongs, iykyk 💀

and that's the whole page, periodt 💖 sourced straight from ./include/linux, dated October 2026 — mwah, go slay some cgroups for me 🧚‍♀️⭐🍓

📦 where this page comes from