collapse_pte_mapped_thp(9)

✨ collapse_pte_mapped_thp(9) ✨

okay bestie, welcome to the Kernel API Manual 💅 this is the page for collapse_pte_mapped_thp, and yes it's a real function, and yes it's kind of a big deal 🌸

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🌟 NAME 🌟

collapse_pte_mapped_thp — the way it tries to collapse a pte-mapped THP for mm at address haddr 🫶 literally that's the whole thing, no cap.

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🎀 SYNOPSIS 🎀

void collapse_pte_mapped_thp (struct mm_struct *mm , unsigned long addr
, bool install_pmd );

three args, one void return, zero drama 💖

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🧚 ARGUMENTS 🧚

• mm — the process address space where the collapse happens. it's giving "whose memory are we doing this to" energy 👑
• addr — the THP collapse address. this is where the magic goes down ✨
• install_pmd — if a huge PMD should be installed. yes/no, true/false, iconic/iconic-er 💅

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🔥 DESCRIPTION 🔥

so here's the tea, bestie ☕ this function goes and checks whether all the PTEs in the PMD are pointing to the right THP. that's the vibe check first, always 🕵️‍♀️

and if they are — slay — it retracts the page table so the THP can refault in with as pmd-mapped. it's basically clearing the runway so the big page can land properly 🛬✨

possibly it'll also install a huge PMD mapping the THP. that's the install_pmd flag doing its main character thing 🙈💜

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🌈 SEE ALSO 🌈

go read these next, bestie, iykyk 📚

• Kernel file ./mm/khugepaged.c — the source, the origin, the mothership 🧚
• struct khugepaged_scan(9)
• collapse_max_ptes_none(9)
• collapse_max_ptes_shared(9)
• collapse_max_ptes_swap(9)
• collapse_file(9)

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💀 reminder: keep every one of those references intact when you cite them, fr fr — they're the whole friend group and nobody gets left behind 🫶

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and that's the page!! tysm for reading, mwah 😭💖 this one shipped out of ./mm in October 2026 — go forth and collapse those pte-mapped THPs, you absolute icon 🌸👑