pcpu_balance_free(9)

💅 pcpu_balance_free — the Kernel API Manual one, bestie ✨

Okay so picture this: it's pcpu_balance_free(9) from the Kernel API Manual, and she's here to manage the amount of free chunks. That's literally the whole vibe. 🎀

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🌸 SYNOPSIS 🌸

void pcpu_balance_free (bool empty_only );

No return value, no drama, she just does the thing and leaves. Iconic behavior honestly.

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🦋 ARGUMENTS 🦋

• empty_only — when this is true, she'll only free chunks if there are no populated pages in them. Like, she checks the vibe first. Respectful queen. 👑

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💖 DESCRIPTION 💖

So here's the tea, bestie:

• If empty_only is false — she's reclaiming all fully free chunks, regardless of how many populated pages they have. No filter, no hesitation. She's taking everything that qualifies. 🔥
• Otherwise (so, if empty_only is true) — she's only reclaiming the chunks that have no populated pages. Strictly the empty ones. Nothing more. 💅

That's it, that's the whole function. Not me being obsessed with a chunk-reclaiming routine but here we are. 🫶

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⭐ CONTEXT ⭐

She runs holding pcpu_lock — but plot twist, the lock can be dropped temporarily. So yeah, she's flexible like that. 🌈

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🎀 SEE ALSO 🎀

All her friends, all in the kernel file ./mm/percpu.c. Impeccable guest list, no notes:

• 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_populated(9)
• pcpu_reclaim_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)

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Heads up bestie: everything above lives in ./mm, and this page is dated October 2026. Yes, a future date. She's ahead of her time, we love a forward-thinking queen. 🧚💜

Anyway mwah, go read the source, ily, bye! 🍓💀✨