mem_cgroup_charge(9)

💖 mem_cgroup_charge(9) 💖

🌟 NAME 🌟

mem_cgroup_charge — Charge a newly allocated folio to a cgroup. This is the Kernel API Manual page, and bestie, it’s literally about charging a newly allocated folio to a cgroup. Main character energy, honestly. 🫶

✨ SYNOPSIS ✨

okay here’s the exact signature, no cap:

int mem_cgroup_charge (struct folio *folio , struct mm_struct *mm ,
gfp_t gfp );

🦋 ARGUMENTS 🦋

• folio — the folio to charge. 💅
• mm — the mm context of the allocating task. 🧚
• gfp — reclaim mode. 🔥

🌸 DESCRIPTION 🌸

So the vibe is: try to charge folio to the memcg that mm belongs to, reclaiming pages according to gfp if necessary. ✨ If mm is NULL, try to charge to the active memcg. 🫶

⚠️ Do not use this for folios allocated for swapin. Not me warning you dramatically, but this is a hard no — fr fr. 💀

🌈 RETURN 🌈

0 on success. Otherwise, an error code is returned. That’s the whole tea, periodt. 💖

👑 SEE ALSO 👑

I’m highkey obsessed with these references, iykyk:

• Kernel file ./include/linux/memcontrol.h
• mem_cgroup_shrink_is_root(9)
• mem_cgroup_uncharge(9)
• mem_cgroup_lruvec(9)
• folio_lruvec(9)
• parent_mem_cgroup(9)

Signed off from ./include/linux, dated October 2026, on the mem_cgroup_charge(9) page — slay and stay charged 💅🎀✨