folio_free_swap(9)

✨ folio_free_swap(9) ✨

okay so this is a page from the Kernel API Manual, and bestie, we're about to learn how to give swap space back 💅 like literally handing the bytes back to the universe. it's giving spring cleaning for your memory. let's GO 🦋

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🌸 NAME 🌸

folio_free_swap — frees the swap space that this folio was using, no cap 💖

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🎀 SYNOPSIS 🎀

bool folio_free_swap (struct folio *folio );

that's the whole vibe check: you hand it a struct folio * and you get a bool back. simple, iconic, periodt ✨

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🫶 ARGUMENTS 🫶

• folio — the folio we're removing. like, the actual star of the show 👑 this is the one whose swap space is getting released.

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💖 DESCRIPTION 💖

so here's the tea ☕ if swap is getting full, or if there are literally no more mappings of this folio, then that's your cue to call folio_free_swap and free its swap space. main character energy: the folio is done, the mappings are gone (or the swap is bursting), and the swap space gets to go home 🏠✨

lowkey important: it's an either/or situation, bestie — swap getting full or no more mappings of the folio. both of those are valid reasons to call it 🙈

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🔥 RETURN 🔥

it returns true if we were actually able to release the swap space 💀 like, that's the good ending. that's the slay.

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🌈 SEE ALSO 🌈

the whole friend group, fr fr — all living in the kernel file ./mm/swapfile.c:

• swap_put_entries_cluster(9)
• swap_dup_entries_cluster(9)
• folio_alloc_swap(9)
• folio_dup_swap(9)
• folio_put_swap(9)
• swap_entry_swapped(9)
• swap_put_entries_direct(9)
• swap_alloc_hibernation_slot(9)
• swap_free_hibernation_slot(9)
• pin_hibernation_swap_type(9)
• unpin_hibernation_swap_type(9)
• find_hibernation_swap_type(9)

iykyk, go read them all, they're all connected 🧚💜

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and that's the page!! this lil beauty comes from ./mm and it's dated October 2026 — go forth and free those swap folios, bestie, you've got this 🍓⭐🎀