clear_young_dirty_ptes(9)

✨ clear_young_dirty_ptes(9) ✨

okay so this is a page from the Kernel API Manual, section 9 — the kernel-internals girlies know 💅

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🎀 NAME 🎀

clear_young_dirty_ptes — marks PTEs that map consecutive pages of the same folio as old/clean. that's it, that's the whole job 🫶

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🌸 SYNOPSIS 🌸

void clear_young_dirty_ptes (struct vm_area_struct *vma , unsigned long
addr , pte_t *ptep , unsigned int nr , cydp_t flags );

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💖 ARGUMENTS 💖

• vma — literally marked -- undescribed -- in the docs 😭 the manpage said "no thoughts, head empty" on this one, so we're not gonna invent anything. ngl it's giving mystery.
• addr — the address where the first page is mapped at. your starting point, bestie 📍
• ptep — page table pointer for the first entry. the entry point, if you will ✨
• nr — how many entries you're marking old/clean. a whole little squad of them 🔥
• flags — flags to modify the PTE batch semantics. yes they change how the batch behaves, and yes that matters 🌈

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🦋 DESCRIPTION 🦋

so this function may be overridden by the architecture — arch girlies get to do their own thing 💅 — otherwise it's implemented by get_and_clear/modify/set for each pte in the range. one by one, no skipping 🎀

heads up: PTE bits in the PTE range besides the PFN can differ! for example, some PTEs might be write-protected. so don't go assuming every entry in the batch is a perfect twin, because it is not 🙈

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👑 CONTEXT 👑

the caller holds the page table lock 🔒 periodt.

the PTEs map consecutive pages that belong to the same folio. and all the PTEs are in the same PMD. same folio, same PMD, no cap 🧚

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⭐ SEE ALSO ⭐

• Kernel file ./include/linux/pgtable.h
• lazy_mmu_mode_enable(9)
• lazy_mmu_mode_disable(9)
• __task_lazy_mmu_mode_pause(9)
• lazy_mmu_mode_pause(9)
• __task_lazy_mmu_mode_resume(9)
• lazy_mmu_mode_resume(9)
• pte_batch_hint(9)
• set_ptes(9)
• get_and_clear_full_ptes(9)
• get_and_clear_ptes(9)
• clear_full_ptes(9)
• clear_ptes(9)
• clear_nonpresent_ptes(9)
• ptep_try_set(9)
• flush_tlb_before_set(9)
• wrprotect_ptes(9)
• clear_flush_young_ptes(9)
• test_and_clear_young_ptes(9)
• modify_prot_start_ptes(9)
• modify_prot_commit_ptes(9)
• pfnmap_setup_cachemode(9)
• pfnmap_track(9)
• pfnmap_untrack(9)
• pfnmap_setup_cachemode_pfn(9)

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and that's the whole page, bestie 🍓 this one lives in ./include/linux, stamped October 2026, and it's filed under clear_young_dirty_ptes(9) — go forth and clear those young dirty PTEs, love u 💜🦋