bpf_get_root_mem_cgroup(9)

📦 version 7.3.1, in nixpkgs unstable

okay so bestie, welcome to bpf_get_root_mem_cgroup(9) — it's chillin' in the Kernel API Manual and it's literally about the root memory cgroup. no cap, the vibes are immaculate ✨

🌸 NAME 🌸

bpf_get_root_mem_cgroup — Returns a pointer to the root memory cgroup. that's the whole assignment, and it ate 💅

✨ SYNOPSIS ✨

the whole vibe is:

__bpf_kfunc struct mem_cgroup * bpf_get_root_mem_cgroup (void );

🎀 ARGUMENTS 🎀

  • void — no arguments. not a single one. it's giving minimalism, and honestly? iconic 🫶

🦋 DESCRIPTION 🦋

so the function has KF_ACQUIRE semantics, even though the root memory cgroup is never destroyed after being created and doesn't require reference counting. like, it's built different and it stays alive forever, periodt 👑

and it's perfectly safe to pass it to bpf_put_mem_cgroup. yes bestie, safe. no drama, no tears, just good clean pointer energy 💖

👑 RETURN 👑

A pointer to the root memory cgroup. that's it. that's the return. main character pointer energy fr fr ⭐

🌈 SEE ALSO 🌈

the kernel file is literally ./mm/bpf_memcontrol.c, and the whole squad is:

iykyk, go read them too 🦋💜

and that's the page, bestie 💋 this lil edition is from source/version ./mm, dated October 2026, and it's all about bpf_get_root_mem_cgroup(9). mwah 🎀

📦 where this page comes from