thp_size(9)

🦋 thp_size — how big even IS this transparent huge page, bestie

okay so this one is from thp_size(9), straight out of the Kernel API Manual, and it's genuinely one of the shortest little guys in the whole kernel doc set — but that doesn't mean we're not gonna give it the full main-character treatment 💅

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✨ NAME ✨

thp_size — literally just: the size of a transparent huge page. that's the whole vibe. no cap. 🎀

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🌸 SYNOPSIS 🌸

unsigned long thp_size (struct page *page );

copy it exactly like that, bestie, spacing and all — do not come for me about formatting, that's how the original eats 🍓

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💖 ARGUMENTS 💖

• page — the head page of a transparent huge page. yes, the head one. the leader. the one with main character energy 👑 the rest of the pages in the huge page are just following along.

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⭐ RETURN ⭐

the return value is the number of bytes in this page. that's it. that's the answer. it's giving "small function, big responsibility" 😭

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🔥 SEE ALSO 🔥

okay this is the part where I need you to brace yourself, because the SEE ALSO section is serving — there are like a million cross-references here and I'm listing every single one because we do not skip entries in this house 🫶

• folio_page_idx(9)
• vma_flag_t(9)
• fault_flag_allow_retry_first(9)
• vma_kernel_pagesize(9)
• folio_order(9)
• folio_reset_order(9)
• folio_mapcount(9)
• folio_mapped(9)
• thp_order(9)
• folio_get(9)
• folio_put(9)
• folio_put_refs(9)
• folios_put(9)
• vma_flags_is_cow_mapping(9)
• vma_is_cow_mapping(9)
• vma_desc_is_cow_mapping(9)
• folio_pfn(9)
• folio_mk_pte(9)
• folio_mk_pmd(9)
• folio_mk_pud(9)
• folio_maybe_dma_pinned(9)
• is_zero_page(9)
• is_zero_folio(9)
• folio_nr_pages(9)
• folio_next(9)
• folio_shift(9)
• folio_size(9)
• folio_maybe_mapped_shared(9)
• folio_expected_ref_count(9)
• zap_vma(9)
• ptdesc_address(9)
• ptdesc_set_kernel(9)
• ptdesc_clear_kernel(9)
• ptdesc_test_kernel(9)
• pagetable_alloc(9)
• pagetable_free(9)
• vma_lookup(9)
• vma_start_pgoff(9)
• vma_end_pgoff(9)
• vma_last_pgoff(9)
• vma_start_anon_pgoff(9)
• vma_end_anon_pgoff(9)
• vma_last_anon_pgoff(9)
• mmap_action_remap(9)
• mmap_action_remap_full(9)
• mmap_action_ioremap(9)
• mmap_action_ioremap_full(9)
• mmap_action_simple_ioremap(9)
• mmap_action_map_kernel_pages(9)
• mmap_action_map_kernel_pages_full(9)
• range_is_subset(9)
• range_in_vma(9)
• range_in_vma_desc(9)
• clear_pages(9)

and if you're wondering where all these live — they're referenced from the kernel file ./include/linux/mm.h. that's the one. that's the header. go look, I'll wait 🧚

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💀 real talk though: thp_size gives you the byte count, but it's asking about a transparent huge page, so pass it the head page and not some random tail page you found lying around. iykyk.

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aaand that's the whole page, bestie — nothing more, nothing less 🌈

sign-off szn: this absolute gem comes to you from ./include/linux, dated October 2026, and it is iconic for being like four lines of actual content and then a whole SEE ALSO wall. obsessed. periodt 💜🎀