cpu_aggr_map__empty_new(9)

💅 cpu_aggr_map__empty_new (9) — Kernel API Manual 🎀

okay so bestie, welcome to the Kernel API Manual, section 9, and today's main character is cpu_aggr_map__empty_new. she's giving very much ✨allocator energy✨ and honestly? she ate.

🌸 NAME 🌸

cpu_aggr_map__empty_new — Create a cpu_aggr_map of size nr with every entry being empty.

like, you hand her a number, she hands you back a whole map where every single slot is a cute lil empty void. no thoughts. head empty. every entry. periodt 💅

✨ SYNOPSIS ✨

struct cpu_aggr_map * cpu_aggr_map__empty_new (int nr );

that's it. that's the whole vibe check. one function, one int, one pointer coming back at you like 🫶

🦋 ARGUMENTS 🦋

• nr — -- undescribed --

bestie. the docs literally left this one blank 😭 it's giving "professor didn't finish the slides." so no cap, the manual does not describe this argument. we are not gonna sit here and invent lore for it — that would be lying, and lying is not iconic. go read the source if you need the tea 🙈

🔥 SEE ALSO 🔥

the whole fam, and yes she travels with a crowd. rollerskates in formation, if you will 🛼:

• Kernel file ./tools/perf/util/cpumap.h — the home base, the mothership, the address 🏠
• 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__get_core_id(9)
• cpu_aggr_map__new(9) — her sister, the one who actually fills stuff in 👑
• 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)

lowkey reminder bestie: nr is genuinely undocumented in this page (-- undescribed --). don't come for me, come for the manpage 💀

okay that's the whole page, you're so welcome, go be smart about cpu aggregation maps and slay responsibly 🧚‍♀️💖

source: ./tools/perf/util · dated: October 2026 · bye bestie, mwah 💋