cgroup_update_dfl_csses(9)

📦 version 7.3.1, in nixpkgs unstable

✨ NAME ✨

cgroup_update_dfl_csses — bestie, this is the one that updates the css assoc of a subtree in the default hierarchy 💅 (and yes, that's the whole vibe of the function, "Kernel API Manual" energy, we're in the kernel docs now 🎀)

🌸 SYNOPSIS 🌸

int cgroup_update_dfl_csses (struct cgroup *cgrp );

🎀 ARGUMENTS 🎀

  • cgrp — the root of the subtree whose csses we're updating 🫶 like, this is the starting point, the main character of the operation.

💅 DESCRIPTION 💅

okay so picture this: cgrp's control masks have changed 😳 and its subtree's css associations need to be updated to match, accordingly, no cap. That's the whole situation.

So this function does the iconic three-step:

  1. it looks up all the css_sets that are attached to the subtree 👀
  2. it creates the matching updated css_sets ✨
  3. it migrates the tasks over to the new ones 🚚💨

like, it's giving "glow-up for the whole subtree", periodt. Obsessed.

🦋 SEE ALSO 🦋

Kernel file ./kernel/cgroup/cgroup.c — and bestie, the friend group here is huge, so buckle up 💖

lowkey that's a lot of cross-references but every single one ate, fr fr 💯 go read them, iykyk

okay bestie that's the whole page 🌈 this one lives in ./kernel/cgroup and it's dated October 2026 — mwah, go slay some css updates 💖✨🦋

📦 where this page comes from