count_free_highmem_pages(9)

💖 count_free_highmem_pages(9) 💖

okay so bestie, welcome to the Kernel API Manual entry for count_free_highmem_pages — yes that's a whole mouthful and yes it's exactly as iconic as it sounds 🫶

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✨ NAME ✨

count_free_highmem_pages — literally computes the total number of free highmem pages 💅 no cap, that's the whole job

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🌸 SYNOPSIS 🌸

unsigned int count_free_highmem_pages (void );

that's it. that's the whole call. she takes nothing, she gives you an unsigned int 👑

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🎀 ARGUMENTS 🎀

• void — no arguments. not a single one. she doesn't need them, she's booked and busy on her own 🌈

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🦋 DESCRIPTION 🦋

so the number she hands back? it's system-wide — like, the whole system, not just your little corner of it. main character energy fr fr 💜

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⭐ SEE ALSO ⭐

okay gather round, because the friend group here is huge and every single one of them is invited to the group chat 💖

kicking it off, all of these live in the kernel file ./kernel/power/snapshot.c:

• get_image_page(9)
• free_image_page(9)
• alloc_rtree_node(9)
• free_mem_extents(9)
• create_mem_extents(9)
• memory_bm_next_pfn(9)
• mark_nosave_pages(9)
• create_basic_memory_bitmaps(9)
• free_basic_memory_bitmaps(9)
• snapshot_additional_pages(9)
• count_highmem_pages(9)
• count_data_pages(9)
• swsusp_free(9)
• preallocate_image_pages(9)
• free_unnecessary_pages(9)
• minimum_image_size(9)
• hibernate_preallocate_memory(9)
• pack_pfns(9)
• snapshot_read_next(9)
• unpack_orig_pfns(9)
• count_highmem_image_pages(9)
• prepare_highmem_image(9)
• copy_last_highmem_page(9)
• prepare_image(9)
• snapshot_write_next(9)
• restore_highmem(9)

like I said. huge friend group. all of them linked, all of them slay 🔥

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ngl if you're poking around hibernation/snapshot code, this is your people. go say hi 👋

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and that's the vibe check bestie — this one came out of ./kernel/power back in October 2026, so big ups to the source and that date 💐 mwah, periodt 💅💖