perf_cpu_map__is_empty(9)

✨ perf_cpu_map__is_empty ✨

okay bestie so this one lives in the Kernel API Manual (that's the manual name, bestie, we're fancy) and it's literally the vibe check for a cpu map 🎀

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💖 NAME 💖

perf_cpu_map__is_empty — does the map contain no values and it doesn't contain the special "any CPU"/dummy value.

like, that's the whole personality. two conditions. both gotta be true. no cap. ✨

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🌸 SYNOPSIS 🌸

LIBPERF_API bool perf_cpu_map__is_empty (const struct perf_cpu_map *map
);

that's it. that's the whole call. LIBPERF_API, returns a bool, takes a const struct perf_cpu_map *. clean. iconic. 💅

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🦋 ARGUMENTS 🦋

• map — -- undescribed -- 🫶

ngl the original page just does not describe this one. it says -- undescribed -- and honestly? it ate. we respect the honesty. it's the const struct perf_cpu_map * you're checking. that's what we know, and that's what we're telling you. 😭

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👑 SEE ALSO 👑

Kernel file ./tools/lib/perf/include/perf/cpumap.h — go read it, iykyk 📖

• struct perf_cpu(9)
• perf_cpu_map__new_any_cpu(9)
• perf_cpu_map__new_online_cpus(9)
• perf_cpu_map__new(9)
• perf_cpu_map__cpu(9)
• perf_cpu_map__nr(9)
• perf_cpu_map__has_any_cpu_or_is_empty(9)
• perf_cpu_map__is_any_cpu_or_is_empty(9)
• perf_cpu_map__min(9)
• perf_cpu_map__max(9)

like the whole cpumap friend group is right there, go say hi 💜

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💀 real talk though bestie: this is the strict one. perf_cpu_map__has_any_cpu_or_is_empty(9) and perf_cpu_map__is_any_cpu_or_is_empty(9) are the chill ones. perf_cpu_map__is_empty says "no values and no special "any CPU"/dummy value" — both. don't mix them up, that's how you end up debugging at 3am 😭✨

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main character energy from ./tools/lib/perf/include/perf, version Kernel API Manual, dated October 2026 — slay, see you in the next one 🧚‍♀️💖🌈