pcpu_reclaim_populated(9)

💖 pcpu_reclaim_populated(9) — Kernel API Manual 💖

okay bestie, this is the pcpu_reclaim_populated(9) page, and it's giving very specific kernel-core energy. iykyk ✨ Let's get into it.

🌸 NAME 🌸

pcpu_reclaim_populated — scan over to_depopulate chunks and free empty pages

✨ SYNOPSIS ✨

void pcpu_reclaim_populated (void );

that's the whole signature, no cap. 💅

🎀 ARGUMENTS 🎀

• void — no arguments. literally none, bestie. 🫶

🦋 DESCRIPTION 🦋

• Scan over chunks in the depopulate list and try to release unused populated pages back to the system. 🌈
• Depopulated chunks are sidelined to prevent repopulating these pages unless required.
• Fully free chunks are reintegrated and freed accordingly (1 is kept around). 👑
• If we drop below the empty populated pages threshold, reintegrate the chunk if it has empty free pages.
• Each chunk is scanned in reverse order to keep populated pages close to the beginning of the chunk. 🦋

💜 CONTEXT 💜

pcpu_lock (can be dropped temporarily). 🫶

🌈 SEE ALSO 🌈

• Kernel file ./mm/percpu.c
• pcpu_addr_in_chunk(9)
• pcpu_check_block_hint(9)
• pcpu_next_md_free_region(9)
• pcpu_next_fit_region(9)
• pcpu_mem_zalloc(9)
• pcpu_mem_free(9)
• pcpu_chunk_relocate(9)
• pcpu_block_update(9)
• pcpu_chunk_refresh_hint(9)
• pcpu_block_refresh_hint(9)
• pcpu_block_update_hint_alloc(9)
• pcpu_block_update_hint_free(9)
• pcpu_is_populated(9)
• pcpu_find_block_fit(9)
• pcpu_alloc_area(9)
• pcpu_free_area(9)
• pcpu_alloc_first_chunk(9)
• pcpu_chunk_populated(9)
• pcpu_chunk_depopulated(9)
• pcpu_chunk_addr_search(9)
• pcpu_alloc(9)
• pcpu_balance_free(9)
• pcpu_balance_populated(9)
• pcpu_balance_workfn(9)
• free_percpu(9)
• is_kernel_percpu_address(9)
• per_cpu_ptr_to_phys(9)
• pcpu_alloc_alloc_info(9)
• pcpu_free_alloc_info(9)
• pcpu_dump_alloc_info(9)
• pcpu_setup_first_chunk(9)
• pcpu_build_alloc_info(9)
• pcpu_embed_first_chunk(9)
• pcpu_page_first_chunk(9)

okay that's the whole page, bestie! source/version: ./mm · date: October 2026 · and the main character of this whole thing is pcpu_reclaim_populated(9). bye, ily! 🫶✨