evsel__is_group_event(9)

💅 evsel__is_group_event — yes bestie, this is a whole manual page

Okay so real talk, the header up top says this lives in the kernel API manual and the function is literally called evsel__is_group_event — say that five times fast, I dare you. It's giving perf-tools main character energy, and we're gonna get through it together. 🫶

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✨ NAME ✨

evsel__is_group_event — returns whether the given evsel is a group event. That's it, that's the whole vibe check. 🎀

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🌸 SYNOPSIS 🌸

bool evsel__is_group_event (struct evsel *evsel );

(Yeah the space before the last paren is canon, she said what she said. 💅)

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🦋 ARGUMENTS 🦋

• evsel — honestly the original page just says -- undescribed -- and like… relatable? 😭 but no cap, that's literally all it gives us, so we're not gonna make up lore. 🙈

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💖 DESCRIPTION 💖

So <pink>evsel</pink> is the evsel selector that's getting tested. Poke it, prod it, see what it says. 🔍

The function returns true iff event group view is enabled and evsel is an actual group leader which has other members in the group. Both conditions, bestie — <hotpink>iff</hotpink> is doing so much heavy lifting in that sentence and she ate. 🔥

So if group view's off, or this evsel is a lone wolf leader with an empty group, it's false. Simple as. 👑

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🧚 SEE ALSO 🧚

Kernel file: ./tools/perf/util/evsel.h

• evsel__read_on_cpu(9)
• evsel__read_on_cpu_scaled(9)
• evsel__is_group_leader(9)

Go read those next, iykyk. ⭐

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And that's the page!! This iconic little number ships from ./tools/perf/util, dated October 2026, and the header/footer both agree it's evsel__is_group_event(9) — periodt. 💜✨🎀