setup_per_zone_wmarks(9)

💖 setup_per_zone_wmarks — the Kernel API Manual bestie 💖

okay so bestie, this is setup_per_zone_wmarks(9) from the Kernel API Manual, and it’s lowkey a short one but it still ate. Let’s get into the lore, no cap. 💅

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🌸 NAME 🌸

setup_per_zone_wmarks — called when min_free_kbytes changes or when memory is hot-{added|removed}. That’s the whole assignment, fr fr. ✨

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🦋 SYNOPSIS 🦋

void setup_per_zone_wmarks (void );

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🎀 ARGUMENTS 🎀

• void — no arguments. literally none, bestie, it’s giving “I need zero input” energy. 🫶

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✨ DESCRIPTION ✨

okay so the whole vibe here is making sure the watermark[min,low,high] values for each zone are set correctly with respect to min_free_kbytes. That’s it. That’s the task. It’s very “keep the watermark situation correct” and honestly? iconic. 💖

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🔥 SEE ALSO 🔥

Kernel file: ./mm/page_alloc.c

• __get_pfnblock_flags_mask(9)
• get_pfnblock_bit(9)
• get_pfnblock_migratetype(9)
• __set_pfnblock_flags_mask(9)
• set_pfnblock_bit(9)
• clear_pfnblock_bit(9)
• set_pageblock_migratetype(9)
• __move_freepages_block_isolate(9)
• __putback_isolated_page(9)
• __free_pages(9)
• free_pages(9)
• alloc_pages_exact(9)
• alloc_pages_exact_nid(9)
• free_pages_exact(9)
• nr_free_zone_pages(9)
• nr_free_buffer_pages(9)
• find_next_best_node(9)
• free_reserved_pages(9)
• __free_contig_range(9)
• alloc_contig_frozen_range(9)
• alloc_contig_range(9)
• alloc_contig_frozen_pages(9)
• alloc_contig_pages(9)
• free_contig_frozen_range(9)
• free_contig_range(9)
• alloc_pages_nolock(9)

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that’s the whole page, bestie 🫶 source/version: ./mm · date: October 2026 · you just read setup_per_zone_wmarks(9) from the Kernel API Manual. periodt 💅✨