cgroup_apply...trol_disable(9)

📦 version 7.3.1, in nixpkgs unstable

👑 cgroup_apply_control_disable — the Kernel API Manual, bestie edition 💅

okay so you're reading a Kernel API Manual page, and the page you want is literally called cgroup_apply...trol_disable(9) (yes the title is truncated, no that's not a typo, that's just how they abbreviate things around here 💀). Buckle up, we're going into the cgroup guts 🫶

🌸 NAME 🌸

cgroup_apply_control_disable — kill or hide csses according to control ✨

🎀 SYNOPSIS 🎀

void cgroup_apply_control_disable (struct cgroup *cgrp );

🦋 ARGUMENTS 🦋

  • cgrp — the root of the target subtree. That's your starting point, the main character of this whole operation 👑

💖 DESCRIPTION 💖

So the vibe here is: we walk cgrp's subtree, and along the way we kill and hide csses so that they match cgroup_ss_mask and cgroup_visible_mask. That's the whole assignment fr fr 🌈

Now, when is a css hidden? When userland asks for it to be disabled but other subsystems are still depending on it 😭 like, it can't just be yeeted out of existence, other stuff needs it. So instead it gets hidden. Sneaky but iconic.

And the rule that comes with the hiding: the css must not actively control resources, and it has to be in the vanilla state if it's ever made visible again later. No cap, that's required — otherwise you'd un-hide a css that's out here still pulling levers 😳

Which means: controllers that may be depended upon should provide ->css_reset for exactly this purpose. That's their little reset button so the vanilla state is guaranteed 🧚

ngl this one's a "read the masks, respect the masks" situation — hide ≠ delete, and the css has to be pristine for its comeback arc ⭐

🌈 SEE ALSO 🌈

Sis, this list is long and honestly? goals. Every single one of these:

and obvs the kernel file it all lives in: ./kernel/cgroup/cgroup.c 🍓 iykyk

that's the whole page bestie, you ate that 💅 the source is ./kernel/cgroup and it's dated October 2026 — so when you're out here hiding csses, know that this lil doc was stamped October 2026 and the version tag on it is still cgroup_apply...trol_disable(9), periodt 🎀✨

📦 where this page comes from