next_demotion_node(9)

💅 next_demotion_node — from the Kernel API Manual 💅

okay bestie, this is the whole vibe for next_demotion_node(9) — the tiny little lookup that tells you where the demotion path goes next. no cap, it's giving “follow the node brick road” energy 🧚✨

🌸 NAME 🌸

next_demotion_node — Get the next node in the demotion path.

✨ SYNOPSIS ✨

int next_demotion_node (int node , const nodemask_t *allowed_mask );

🎀 ARGUMENTS 🎀

• node — The starting node to lookup the next node.
• allowed_mask — The pointer to allowed node mask.

💖 RETURN 💖

You get the node id for the next memory node in the demotion path hierarchy from node; NUMA_NO_NODE if node is terminal. This does not keep node online or guarantee that it continues to be the next demotion target. 🫶

⚠️ real talk: that “does not keep node online” part is important — it is not a promise that the node stays available, and it is not a guarantee that it keeps being the next demotion target.

🌈 SEE ALSO 🌈

• Kernel file ./mm/memory-tiers.c
• folio_use_access_time(9)
• register_mt_adistance_algorithm(9)
• unregister_mt_adistance_algorithm(9)
• mt_calc_adistance(9)

okay that’s the page, bestie 💅 source is ./mm, dated October 2026, and it’s literally next_demotion_node(9) — periodt ✨🎀🦋