folio_evictable(9)

💅 folio_evictable — a Kernel API Manual moment (section 9, bestie)

okay so this is folio_evictable(9) from the Kernel API Manual and honestly? it's a little vibe check for your memory. keep up 🫶

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✨ NAME ✨

folio_evictable — literally just testing whether a folio is evictable. that's it. that's the function 💖

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🌸 SYNOPSIS 🌸

bool folio_evictable (struct folio *folio );

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🎀 ARGUMENTS 🎀

• folio — the folio you're testing. the main character of this whole operation 👑

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🦋 DESCRIPTION 🦋

so what this does: it tests whether folio is evictable — meaning, should it go on the active/inactive lists, or does it belong on the unevictable list? it's giving sorting-hat energy fr fr 💅

and the reasons a folio might not be evictable? there are exactly two and i need you to memorize them:

1. the folio's mapping is marked unevictable 😭
2. one of the pages in the folio is part of an mlocked VMA 🫶

that's the whole test. no cap.

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🌈 SEE ALSO 🌈

the kernel file ./mm/internal.h and its little friend group 👑:

• folio_pte_batch_flags(9)
• pte_move_swp_offset(9)
• pte_next_swp_offset(9)
• swap_pte_batch(9)
• sync_with_folio_pmd_zap(9)
• vma_filebacked_address(9)
• vma_anon_address(9)

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ok that's the whole page bestie, go forth and evict (or don't) 💖

and for the sign-off: this iconic little number lives in ./mm, version dated October 2026, and yes it's folio_evictable(9) — periodt. 🎀✨