mem_cgroup_...e_protection(9)

💖 mem_cgroup_...e_protection(9) 💖

okay so bestie, this one comes from the Kernel API Manual, and the actual function is mem_cgroup_calculate_protection — yes the header is doing that truncated-name thing, we love a mysterious queen ✨

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🌸 NAME 🌸

mem_cgroup_calculate_protection — check if memory consumption is in the normal range 💅

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✨ SYNOPSIS ✨

void mem_cgroup_calculate_protection (struct mem_cgroup *root , struct
       mem_cgroup *memcg );

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🎀 ARGUMENTS 🎀

• root — the top ancestor of the sub-tree being checked 🌳
• memcg — the memory cgroup to check 👀

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🧠 DESCRIPTION 🧠

⚠️ WARNING: This function is not stateless! It can only be used as part of a top-down tree iteration, not for isolated queries. fr fr, do not just call it randomly and expect a cute little standalone answer 😭

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👑 SEE ALSO 👑

Kernel file ./mm/memcontrol.c — plus all these iconic little friends:

• 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)
• get_mem_cgroup_from_folio(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_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)

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xoxo, signed off from ./mm — October 2026 — with the Kernel API Manual energy we deserve 💅✨🫶