try_to_unmap(9)

📦 version 7.3.1, in nixpkgs unstable

🦋 try_to_unmap — like, the kernel API manual bestie 💅

okay so bestie, we're in the Kernel API Manual today and the page is literally called try_to_unmap(9) and honestly? she's a baddie. let's get into it ✨

🌸 NAME 🌸

try_to_unmap — try to remove all the page table mappings to a folio. that's the whole vibe. no cap.

✨ SYNOPSIS ✨

void try_to_unmap (struct folio *folio , enum ttu_flags flags );

look at her go 🫶 the signature is right there, don't touch it, she's perfect.

🎀 ARGUMENTS 🎀

  • folio — the folio we're unmapping. that's the main character of this whole operation ngl 💖
  • flags — the action and the flags. that's it, that's the description, the manpage said so and we respect it 🙈

🔥 DESCRIPTION 🔥

so the whole point: try_to_unmap tries to remove all the page table entries that are currently mapping this here <italic>folio</italic>. like, every single one. it's giving eviction notice 💀

and here's the part you CANNOT skip — it is the caller's responsibility to check if the folio is still mapped, if that's something you need. bestie, it's not gonna do it for you. use TTU_SYNC to prevent accounting races, okay? write that down 📝

ngl this is the one where you gotta do your own homework after. the function tries, she doesn't promise. periodt.

👑 CONTEXT 👑

the caller must hold the folio lock. no exceptions, no wiggle room, not negotiable. hold the lock or don't come to the function 💅🔒

🌈 SEE ALSO 🌈

the kernel file lives at ./mm/rmap.c and honestly? the whole friend group is here. say hi:

like. that's the whole group chat. iykyk 💜

and that's the page!! 🧚‍♀️✨ big kiss to the <italic>./mm</italic> crew, dated October 2026, filed under try_to_unmap(9) in the Kernel API Manual — slay forever, mwah 🫶🎀💖

📦 where this page comes from