swap_put_entries_direct(9)

📦 version 7.3.1, in nixpkgs unstable

okay bestie, welcome to swap_put_entries_direct(9) — it's from the Kernel API Manual, and it's giving “release the reference, then reclaim if nobody's holding on” realness 💅✨

🎀 NAME 🎀

swap_put_entries_direct is literally the “drop a reference on this whole range of swap entries” girlie, and if no more references remain, she also tries to reclaim their cache. slay. 💖

✨ SYNOPSIS ✨

void swap_put_entries_direct (swp_entry_t entry , int nr );

🌸 ARGUMENTS 🌸

  • entry — the first entry of the range. 🎀
  • nr — the number of entries in the range. 🦋

💖 DESCRIPTION 💖

okay so here's the lore: it goes through each swap entry in the contiguous range and releases a reference. If any swap entries become free, it tries to reclaim their underlying folios — but only if those folios are present. 👑

The offset range is defined by [entry.offset, entry.offset + nr), no cap. 🌈

🦋 CONTEXT 🦋

bestie, caution moment: the caller must ensure there is no race condition on the reference owner — e.g., by locking the PTL of a PTE containing the entry being released. Don't skip the lock, iykyk. 🔒😭

🔥 SEE ALSO 🔥

Kernel file: ./mm/swapfile.c

that's the whole page, bestie — sourced from ./mm, dated October 2026, and filed under swap_put_entries_direct(9). mwah 💋🫶🌈

📦 where this page comes from