binder_alloc_free_page(9)

💅 binder_alloc_free_page(9) — the Kernel API Manual, but make it make sense ✨

okay so bestie, you found a kernel manpage in section 9 of the Kernel API Manual, and honestly? it's a little icon and you're about to understand it fr fr 🫶

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🎀 NAME 🎀

binder_alloc_free_page — the shrinker callback whose whole job is freeing pages. that's it, that's the vibe 💅

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🌸 SYNOPSIS 🌸

enum lru_status binder_alloc_free_page (struct list_head *item ,
                                        struct list_lru_one *lru ,
                                        void *cb_arg );

like, look at her. three args, returns an enum lru_status. main character energy fr 🔥

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🦋 ARGUMENTS 🦋

• item — the item to free. yes literally, this is the thing getting freed, no cap 🍓
• lru — the list_lru instance that item belongs to. it's giving "know your roots" 🌈
• cb_arg — the callback argument. mysterious, lowkey, does its thing 🙈

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💖 DESCRIPTION 💖

so this one gets called from list_lru_walk inside binder_shrink_scan, and its whole purpose in life is to free up pages when the system is under memory pressure 😭✨ like when RAM is going through it, this function shows up and does the freeing. periodt.

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👑 SEE ALSO 👑

the kernel file that houses all this magic:

• ./drivers/android/binder_alloc.c

and the whole friend group of related functions (collect them all, iykyk 💜):

• binder_alloc_prepare_to_free(9)
• binder_alloc_new_buf(9)
• binder_alloc_get_page(9)
• binder_alloc_clear_buf(9)
• binder_alloc_free_buf(9)
• binder_alloc_mmap_handler(9)
• binder_alloc_print_allocated(9)
• binder_alloc_print_pages(9)
• binder_alloc_get_allocated_count(9)
• binder_alloc_vma_close(9)
• binder_alloc_init(9)
• check_buffer(9)
• binder_alloc_copy_user_to_buffer(9)

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🧚 tiny note bestie: none of these are optional reading if you're going deep — every single one is linked on purpose 💫

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and that's the page!! sign-off time 🎀 this one lives under ./drivers/android, dated October 2026, and the header/footer both literally just say binder_alloc_free_page(9) over and over because the manual loves consistency. slay 💅✨