cpu__get_core_id(9)

💖 cpu__get_core_id — a whole manpage, but make it bestie 💖

okay so this is cpu__get_core_id(9) from the Kernel API Manual — yes, the kernel has lore and yes we're gonna read it together 🫶

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✨ NAME ✨

cpu__get_core_id — returns the core id, read straight out of /sys/devices/system/cpu/cpuX/topology/core_id, for the CPU you hand it. that's it. that's the whole job. and honestly? iconic for that 🌸

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🎀 SYNOPSIS 🎀

int cpu__get_core_id (struct perf_cpu cpu );

it takes one struct perf_cpu and gives you back an int. simple. clean. no cap 💅

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🦋 ARGUMENTS 🦋

• cpu — literally listed as -- undescribed -- in the source docs 😭 so like… the manual itself is being mysterious about it. it's the struct perf_cpu from the synopsis. we know that. the docs just chose not to elaborate and honestly, respect the confidence 💀

ngl, bestie, if you need to know more about cpu you're gonna have to go read the header, because this page is giving absolutely nothing on that front 🙈

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👑 SEE ALSO 👑

the whole friend group, fr fr — all from the kernel file ./tools/perf/util/cpumap.h:

• cpu_map__is_dummy(9)
• cpu__get_node(9)
• cpu__get_socket_id(9)
• cpu__get_die_id(9)
• cpu__get_cluster_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)

like okayyy topology family reunion 🌈 every single one of them is on the list, we don't gatekeep here ✨

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and that's the whole page, bestie 💖 shoutout to ./tools/perf/util for shipping this from October 2026 — the source, the version, the date, all of it, mwah 🍓 go read your topology ids. slay. periodt 🧚‍♀️