sys_kernel_cgroup(5)

💖 NAME 💖

/sys/kernel/cgroup/ — Linux control groups, bestie

✨ SYNOPSIS ✨

/sys/kernel/cgroup/

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🦋 DESCRIPTION 🦋

🌸 /sys/kernel/cgroup/delegate (since Linux 4.15)

okay so this file is literally handing you a list of the cgroups v2 files (one per line, no cap) that are delegatable — meaning their ownership should be changed over to the user ID of the delegatee. 👑

and like, the plot twist is that in the future the set of delegatable files may change or grow, so this file is the kernel's way of telling user-space applications which files must be delegated. it's giving "here's the assignment, don't guess." 📋

as at Linux 4.15, this is what you see when you peek at it:

$ cat /sys/kernel/cgroup/delegate
cgroup.procs
cgroup.subtree_control
cgroup.threads

🌈 /sys/kernel/cgroup/features (since Linux 4.15)

over time, the set of cgroups v2 features the kernel provides may change or grow, or some features may just... not be enabled by default. 🙈 so this file exists so user-space applications can discover what features the running kernel supports and has enabled. the features are listed one per line:

$ cat /sys/kernel/cgroup/features
nsdelegate
memory_localevents

the entries that can show up in this file are, like, the whole guest list:

⭐ memory_localevents (since Linux 5.2)

the kernel supports the memory_localevents mount option. periodt.

💅 nsdelegate (since Linux 4.15)

the kernel supports the nsdelegate mount option. iconic.

🔥 memory_recursiveprot (since Linux 5.7)

the kernel supports the memory_recursiveprot mount option. slay.

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👑 STANDARDS 👑

Linux. that's it, that's the standard. 🌟

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🎀 HISTORY 🎀

Linux 2.6.0 — ancient history but make it cute. 🦕

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🫶 SEE ALSO 🫶

• sys_kernel(5)
• cgroups(7)

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okay bestie that's the whole page, you ate that 🍓 if you need me i'll be in /sys/kernel/cgroup/ doing vibe checks. this was the Linux man-pages 6.20 era, dated 2026-09-09, mwah 💖✨