consume_stock(9)

💖 NAME 💖

okay bestie, welcome to consume_stock(9) from the Kernel API Manual ✨ its whole thing is: try to consume stocked charge on this cpu. no cap.

🌸 SYNOPSIS 🌸

bool consume_stock (struct mem_cgroup *memcg , unsigned int nr_pages );

🎀 ARGUMENTS 🎀

• memcg — the memcg to consume from. literally the one you're pulling from 💅
• nr_pages — how many pages to charge. the page count, bestie.

🦋 DESCRIPTION 🦋

so consume_stock() consumes the cached charge if enough nr_pages are present; otherwise it returns failure 😭. it also returns failure if the charge request is larger than MEMCG_CHARGE_BATCH, or if the local lock is already taken. yes, that's a real failure case, not a drill 💀

and it returns true if successful, false otherwise. periodt. 👑

✨ SEE ALSO ✨

Kernel file ./mm/memcontrol.c is the main spot, and the whole friend group is:

• 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)
• __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)
• obj_cgroup_uncharge_zswap(9)

bye bestie 💅 this one comes from ./mm, dated October 2026, and it's consume_stock(9) 🫶