get_mem_cgroup_from_folio(9)

💖 get_mem_cgroup_from_folio(9) 💖

🌸 NAME 🌸

get_mem_cgroup_from_folio — Obtain a reference on a given folio's memcg. 🫶 and yes bestie, this page is from the Kernel API Manual — iconic.

🦋 SYNOPSIS 🦋

okay so the signature is literally:

struct mem_cgroup * get_mem_cgroup_from_folio (struct folio *folio );

🎀 ARGUMENTS 🎀

• folio — folio from which memcg should be extracted. 💅 that's the folio you're pulling the memcg out of, no cap.

✨ DESCRIPTION ✨

See folio_memcg for folio->objcg/memcg binding rules. that's the whole lore drop, bestie — literally the entire description 😭.

🔥 SEE ALSO 🔥

Kernel file ./mm/memcontrol.c is also in the mix, and the whole SEE ALSO crew is:

• get_mem_cgroup_css_from_folio(9)
• page_cgroup_ino(9)
• lruvec_page_state_monotonic(9)
• mod_memcg_state(9)
• mod_lruvec_state(9)
• count_memcg_events(9)
• get_mem_cgroup_from_mm(9)
• get_mem_cgroup_from_current(9)
• mem_cgroup_iter(9)
• mem_cgroup_iter_break(9)
• mem_cgroup_scan_tasks(9)
• folio_lruvec_lock(9)
• folio_lruvec_lock_irq(9)
• folio_lruvec_lock_irqsave(9)
• mem_cgroup_update_lru_size(9)
• mem_cgroup_margin(9)
• mem_cgroup_print_oom_context(9)
• mem_cgroup_print_oom_meminfo(9)
• mem_cgroup_get_oom_group(9)
• consume_stock(9)
• __memcg_kmem_charge_page(9)
• __memcg_kmem_uncharge_page(9)
• mem_cgroup_wb_stats(9)
• mem_cgroup_from_private_id(9)
• mem_cgroup_css_reset(9)
• mem_cgroup_calculate_protection(9)
• mem_cgroup_charge_hugetlb(9)
• mem_cgroup_swapin_charge_folio(9)
• mem_cgroup_replace_folio(9)
• mem_cgroup_migrate(9)
• mem_cgroup_sk_charge(9)
• mem_cgroup_sk_uncharge(9)
• __mem_cgroup_try_charge_swap(9)
• __mem_cgroup_uncharge_swap(9)
• obj_cgroup_may_zswap(9)
• obj_cgroup_charge_zswap(9)
• obj_cgroup_uncharge_zswap(9)

mwah 💋 — source/version ./mm, date October 2026, page get_mem_cgroup_from_folio(9).