__mem_cgroup_uncharge_swap(9)

💅 __mem_cgroup_uncharge_swap (9) 💅

okay bestie, so this is a page straight outta the Kernel API Manual, and it's giving "one tiny function that does exactly one thing" energy. iconic of it, honestly 🎀

---

✨ NAME ✨

__mem_cgroup_uncharge_swap — uncharge swap space 🫶

That's it. That's the whole vibe. It uncharges swap space. no cap.

---

🌸 SYNOPSIS 🌸

void __mem_cgroup_uncharge_swap (unsigned short id , unsigned int
nr_pages );

return type is void, so it's not gonna hand you anything back — it just does the thing and dips 💅

---

🦋 ARGUMENTS 🦋

• id — the cgroup id to uncharge. this is your "who are we uncharging" of the situation 👑
• nr_pages — the amount of swap space to uncharge. like, how much of it. a whole number of pages, specifically 🍓

two args, both literally doing exactly what they say on the tin. we love a straightforward icon ✨

---

⭐ SEE ALSO ⭐

okay so the source of truth here is the kernel file ./mm/memcontrol.c and it has a lot of friends. like, an entire group chat. here's everybody:

• 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)
• obj_cgroup_may_zswap(9)
• obj_cgroup_charge_zswap(9)
• obj_cgroup_uncharge_zswap(9)

bestie there are 37 of them, i counted, and yes you should probably go read the sibling __mem_cgroup_try_charge_swap(9) and __memcg_kmem_uncharge_page(9) if you're doing the whole charge/uncharge duo thing. iykyk 💜

---

🧚 sign-off 🧚

and that's the whole page!! it lives in ./mm, the manual's dated October 2026, and it's filed under that same __mem_cgroup_uncharge_swap(9) header we started with. slay, bye, go uncharge some swap 💖🌈

---