mem_pool_used(9)

💅 mem_pool_used(9) — Kernel API Manual

okay bestie, so this is a kernel API page, section 9, and we're literally about to learn how to peek at a memory pool's used-slot count. it's giving "quick little helper function" energy and honestly? obsessed. 🎀

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✨ NAME ✨

mem_pool_used — get the number of used slots in a memory pool 💖

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🌸 SYNOPSIS 🌸

unsigned long mem_pool_used (struct io_tlb_pool *pool );

that's the whole call, no cap. it hands you back an unsigned long and takes exactly one argument. periodt. ✨

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🦋 ARGUMENTS 🦋

• pool — the Software IO TLB memory pool. like, the actual pool you're curious about. that's it, that's the argument 🫶

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💜 DESCRIPTION 💜

so the vibe here is: you call it, you get a number. but bestie, hear me — the result is not accurate. fr fr. it's not the real, exact count. the page straight up tells you to go look at mem_used for the details on that. so don't @ me if the number looks a little sus 😭

💀 real talk: "not accurate" is literally in the docs. treat this as a ballpark, not gospel.

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🔥 RETURN 🔥

the approximate number of used slots. approximately. like how approximately five more minutes. 🕐✨

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👑 SEE ALSO 👑

the whole friend group, all here, all iconic:

• Kernel file ./kernel/dma/swiotlb.c ⭐
• struct io_tlb_slot(9)
• struct io_tlb_area(9)
• swiotlb_adjust_nareas(9)
• limit_nareas(9)
• add_mem_pool(9)
• alloc_dma_pages(9)
• swiotlb_alloc_tlb(9)
• swiotlb_free_tlb(9)
• swiotlb_alloc_pool(9)
• swiotlb_dyn_alloc(9)
• __swiotlb_find_pool(9)
• swiotlb_del_pool(9)
• swiotlb_dev_init(9)
• swiotlb_align_offset(9)
• swiotlb_search_pool_area(9)
• swiotlb_search_area(9)
• swiotlb_find_slots(9)
• mem_used(9)
• swiotlb_tbl_map_single(9)
• swiotlb_del_transient(9)
• is_swiotlb_allocated(9)
• default_swiotlb_base(9)
• default_swiotlb_limit(9)

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🌈 and that's the whole page, bestie! this one comes to you from ./kernel/dma, dated October 2026, and it's filed under mem_pool_used(9) 🎀 go forth and approximately count your slots 💖✨