cpu_map__is_dummy(9)

✨ NAME ✨

okay so we're in the Kernel API Manual, and the main character is cpu_map__is_dummy(9). The whole lore is literally this: events associated with a pid, rather than a CPU, use a single dummy map with an entry of -1. That's the vibe, that's the whole page, periodt. 💅

🛠️ SYNOPSIS 🛠️

bool cpu_map__is_dummy (const struct perf_cpu_map *cpus );

🌸 ARGUMENTS 🌸

• cpus — the manual says undescribed, and honestly bestie, that's all we're getting. It's the const struct perf_cpu_map * from the signature, no invented lore, no cap. 🫶

🔗 SEE ALSO 🔗

go peek at the Kernel file ./tools/perf/util/cpumap.h, plus these iconic references:

• 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__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)

made with 💖 from the ./tools/perf/util source/version, dated October 2026. 🎀