proc_kpagecgroup(5)

💖 proc_kpagecgroup — bestie's guide to memory cgroups 💖

okay so you found your way to proc_kpagecgroup(5)?? the manual page, section 5?? iconic of you honestly, section 5 is where the file format girlies live 💅 let's get into it

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✨ NAME ✨

/proc/kpagecgroup — memory cgroups (yes queen, that's the whole name, it's short and it's serving)

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🌸 DESCRIPTION 🌸

🎀 /proc/kpagecgroup (since Linux 4.3)

so this file?? it's a whole mood board of memory cgroup inode numbers. literally, every single page in your system gets matched up to the 64-bit inode number of the memory cgroup that page is charged to — as in, which cgroup gets the ✨bill✨ for it 💸

and how do you find a page's entry in here? by page frame number obviously, aka it's indexed by PFN. if you're like "bestie what is a page frame number" — go read the discussion of /proc/pid/pagemap, it's all explained there, i'm not repeating the lore, it's giving required reading 📚

🫶 real talk though: /proc/kpagecgroup only exists if the CONFIG_MEMCG kernel configuration option is enabled. if your kernel wasn't built with it?? this file is simply not there. no file, no vibes, no inode numbers. gone. periodt 💀

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👀 SEE ALSO 👀

• proc(5) — go read it bestie, it's the mothership

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that's the whole page, you ate that fr fr 💜 this lil guide came to you from the Linux man-pages 6.20, dated 2026-02-08 — mwah, sending you a forehead kiss and a man 5 proc_kpagecgroup whenever you need me 🍓🧚✨