__memcg_kmem_uncharge_page(9)

💅 __memcg_kmem_uncharge_page — uncharge a kmem page

okay so bestie, welcome to the Kernel API Manual ✨ this one's a function page, and it's short and sweet — honestly iconic for that. Let's get into it 🫶

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🌸 NAME 🌸

__memcg_kmem_uncharge_page — uncharge a kmem page 💖

Like, it takes the charge back off. Un-charge. De-charge. Give the memory accounting its bag back. no cap.

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✨ SYNOPSIS ✨

void __memcg_kmem_uncharge_page (struct page *page , int order );

that's it. that's the whole signature. two args, returns nothing (void), does its thing. slay 💅

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🎀 ARGUMENTS 🎀

• page — the page to uncharge 💖 that's page, a struct page *. this is the main character of the whole operation, fr
• order — the allocation order 🔥 like, how big the allocation was, as in the buddy allocator's order. you're telling it what size situation you're undoing

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🦋 SEE ALSO 🦋

okay this is the part where the manpage goes absolutely feral with the cross-references, and honestly? obsessed. the whole squad lives in the kernel file ./mm/memcontrol.c:

• 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) ← the literal opposite of this one, the charge to our uncharge, iykyk 👑
• 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)

like, thirty-seven cross-refs. thirty-seven. she ate and left no crumbs 🍓

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ngl there are no options, no env vars, no exit statuses, and no bug notes on this page — it's just a humble little uncharge function doing its job. vibe check: passed 🌈

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mwah 💜 this page came from the ./mm source tree, dated October 2026, and it lives happily under the __memcg_kmem_uncharge_page(9) name. go uncharge something, bestie — responsibly 🧚✨