obj_cgroup_uncharge_zswap(9)

💅 obj_cgroup_uncharge_zswap

okay bestie, welcome to the Kernel API Manual — section 9, we're in the kernel internals era and it's honestly giving main character energy. this one's a tiny little function, but she's important, so let's get into it ✨

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🎀 NAME 🎀

obj_cgroup_uncharge_zswap — uncharge compression backend memory

like, she uncharges stuff. that's her whole thing. 💸

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✨ SYNOPSIS ✨

void obj_cgroup_uncharge_zswap (struct obj_cgroup *objcg , size_t size
);

no cap, that's the whole signature. two args, returns nothing (void), very demure, very mindful 🫶

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🌸 ARGUMENTS 🌸

• objcg — the object cgroup 👑 like, the cgroup we're doing the uncharging on
• size — size of compressed object 📦 literally just how big the compressed thing is

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🦋 DESCRIPTION 🦋

Uncharges zswap memory on page in. 💫

that's it, that's the description. short and iconic, she ate and left no crumbs. when a page comes in, the zswap memory that was being charged gets uncharged. periodt. 🔥

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🌈 SEE ALSO 🌈

okay so this is the part where I list literally everyone in the group chat 💖 — and yes, all of them, because we don't do half-finished lists here:

Kernel file ./mm/memcontrol.c, plus:

• 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_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)

that's the whole squad, iykyk 💜

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ngl, if you're reading this at 3am in ./mm/memcontrol.c wondering why your zswap accounting looks weird — hi, same, sending hugs 🫂

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and that's the page, bestie! 🎀 this lil' entry comes to you from the source ./mm, dated October 2026, and yes the page name is obj_cgroup_uncharge_zswap(9) — mwah, go touch some folios 💋🧚‍♀️