memory_grou...ster_dynamic(9)

💖 memory_group_register_dynamic(9) 💖

okay so bestie, we're in the Kernel API Manual today and the star of the show is memory_group_register_dynamic — yes the header truncates it to memory_grou...ster_dynamic(9) but we know her full name, she's iconic like that ✨

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🌸 NAME 🌸

memory_group_register_dynamic — register a dynamic memory group 🎀

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🦋 SYNOPSIS 🦋

int memory_group_register_dynamic (int nid , unsigned long unit_pages );

that's the whole signature, no cap, she takes exactly two things and hands you back an int 💅

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⭐ ARGUMENTS ⭐

• nid — the node id, literally just the node id, that's it 🫶
• unit_pages — the unit in pages in which memory gets added/removed in this dynamic memory group 📦

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🌈 DESCRIPTION 🌈

so what she does is: register a brand-new dynamic memory group and return the memory group id 👑

memory inside a dynamic memory group is added/removed dynamically in unit_pages — that's the whole vibe, it's giving flexible, it's giving main character energy 🧚

💀 warning bestie: she returns an error if you're out of memory, if the node id is invalid, if no new memory groups can be registered, or if unit_pages is invalid — and "invalid" here means 0, not a power of two, or smaller than a single memory block. three separate ways to fumble it, don't be that girl 😭

otherwise? she returns the new memory group id. slay ✨

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👑 SEE ALSO 👑

peep these in the kernel file ./drivers/base/memory.c — she runs with a whole crew fr fr:

• memory_block_advise_max_size(9)
• memory_block_advised_max_size(9)
• memory_block_add_nid_early(9)
• walk_memory_blocks(9)
• for_each_memory_block(9)
• memory_group_register_static(9)
• memory_group_unregister(9)

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okay that's the whole page, ily, go register some dynamic memory groups responsibly 💖

this lil manpage lives in ./drivers/base, dated October 2026, from the Kernel API Manual — mwah, see u next time bestie 🍓🌸💜