cpu__get_die_id(9)

💅 cpu__get_die_id(9) — the Kernel API Manual, but make it cute

okay so bestie, welcome to the Kernel API Manual, section 9, and today's main character is cpu__get_die_id ✨ no cap, this one's short but she's iconic.

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🌸 NAME 🌸

cpu__get_die_id — returns the die id, and like… it literally reads it straight from /sys/devices/system/cpu/cpuX/topology/die_id for the CPU you hand it. that's the whole vibe. iykyk 💫

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🦋 SYNOPSIS 🦋

int cpu__get_die_id (struct perf_cpu cpu );

that's it. that's the function. copy it exactly, bestie, don't be out here improvising 🎀

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🎀 ARGUMENTS 🎀

• cpu — undescribed 🙈

okay so real talk: the docs literally just say undescribed for this one. not me making up lore that isn't there — the manual page gives us nothing on cpu beyond its name and its type in the synopsis, so that's all we're claiming. struct perf_cpu cpu, that's the girl. 💀

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👑 SEE ALSO 👑

like, go read these next, fr fr — they're all hanging out in the kernel file ./tools/perf/util/cpumap.h and they're giving family reunion energy 🫶

• cpu_map__is_dummy(9)
• cpu__get_node(9)
• cpu__get_socket_id(9)
• cpu__get_cluster_id(9)
• cpu__get_core_id(9)
• cpu_aggr_map__empty_new(9)
• cpu_aggr_map__new(9)
• aggr_cpu_id__socket(9)
• aggr_cpu_id__die(9)
• aggr_cpu_id__cluster(9)
• aggr_cpu_id__core(9)
• aggr_cpu_id__node(9)
• aggr_cpu_id__global(9)

every single one, listed, not a crumb left behind 💖

lowkey a warning tho: this page has no extra notes, no exit statuses, no signals, no environment variables, no bugs section — so don't let anyone tell you there is. what you see is what you get, and what we got is a die-id getter. periodt. 🔥

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🌈 sign-off 🌈

this lil masterpiece lives in ./tools/perf/util, dated October 2026, and it's filed under cpu__get_die_id(9) — go off, king 👑💅 slay 🌸🦋⭐