blk_mq_num_possible_queues(9)

💅 blk_mq_num_possible_queues(9) — from the Kernel API Manual, bestie

Okay so picture this: you're deep in the kernel, you've got a multiqueue device (yes, the fancy one), and you need to know how many queues you're actually working with. That's this function. It literally says it in the name — blk_mq_num_possible_queues — "calc nr of queues for multiqueue devices." Iconic. No notes.

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✨ SYNOPSIS ✨

unsigned int blk_mq_num_possible_queues (unsigned int max_queues );

Returns an unsigned int, takes one unsigned int called max_queues. Simple, clean, slay.

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🎀 ARGUMENTS 🎀

• max_queues — the maximum number of queues that the hardware/driver can support. That's the ceiling, the limit, the "know your worth" number. And heads up: if max_queues is 0, the argument is just… ignored. Not used. Skipped. It said "not today" and the function moves on. 🫶

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🦋 DESCRIPTION 🦋

So what does it actually do? It calculates the number of queues to be used for a multiqueue device, based on the number of possible CPUs. That's it. That's the whole vibe. It's giving matchmaker, but for queues and CPUs. 💖

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👑 SEE ALSO 👑

Go touch some grass (or, like, read these):

• Kernel file ./block/blk-mq-cpumap.c
• blk_mq_num_online_queues(9)
• blk_mq_hw_queue_to_node(9)
• blk_mq_map_hw_queues(9)

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💀 fr fr, if you're poking around block layer queue mapping, read the whole little family up there — they all live together in the same corner of the kernel and they talk to each other. iykyk.

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🌸 That's the whole page, bestie — brought to you by ./block, dated October 2026, straight out of the Kernel API Manual. Go forth and queue responsibly. periodt. 💜