mem_cgroup_s...charge_folio(9)

💅 mem_cgroup_s...charge_folio(9) — Kernel API Manual ✨

okay so bestie, welcome to the kernel API manual, this one's about mem_cgroup_s...charge_folio(9) and it's genuinely so niche but so important 🫶

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✨ NAME ✨

mem_cgroup_swapin_charge_folio — charge a newly allocated folio for swapin, no cap 💸

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🦋 SYNOPSIS 🦋

int mem_cgroup_swapin_charge_folio (struct folio *folio , unsigned short
id , struct mm_struct *mm , gfp_t gfp );

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🎀 ARGUMENTS 🎀

• folio — the folio to charge, that's the main character here 👑
• id — the memory cgroup id, iykyk
• mm — mm context of the victim 😭
• gfp — reclaim mode, literally the vibe check for reclaim

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🌸 DESCRIPTION 🌸

So this function charges a folio that was allocated for swapin. That's it, that's the whole gig 💖

⚠️ bestie pls listen: call this before adding the folio to the swapcache. Like, before. Not after. Periodt. 🙈

It returns 0 on success. Otherwise, an error code comes back at you, and you deal with it 😭

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👑 SEE ALSO 👑

Kernel file ./mm/memcontrol.c, plus the whole friend group right here 🫶

• 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_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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and that's the tea, bestie 🍓 this page came from ./mm, dated October 2026, and it's filed right back under mem_cgroup_s...charge_folio(9) 💜 slay, go charge those folios ✨🎀