time_after(9)

✨ time_after(9) ✨

okay so bestie, welcome to the Kernel API Manual entry for time_after — yes that's the manual name, we're fancy now 💅 this whole page is literally just the kernel's way of asking "is a later than b?" and honestly? relatable.

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🌸 NAME 🌸

time_after — returns true if the time a is after time b. that's it. that's the whole vibe. 🎀

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🦋 SYNOPSIS 🦋

bool time_after (u64 a , u64 b );

look at her. so clean. so iconic. 👑

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🍓 ARGUMENTS 🍓

• a — the first thing we're comparing, and it's a u64. yes, specifically u64, no cap.
• b — the second thing we're comparing, also a u64. they match, it's giving symmetry 🫶

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💜 DESCRIPTION 💜

so here's the tea: do this with <0 and >=0 to only test the sign of the result. like, only check the sign, nothing else — that's the whole trick.

and the compiler tea? a good compiler would generate better code for this (and a really good compiler wouldn't even care). gcc is currently neither 😭 like not one, not the other, just out here being mid. fr fr.

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🌈 RETURN 🌈

true if time a is after time b, otherwise false. simple as that, bestie. no surprises, no plot twists 💀

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🔥 SEE ALSO 🔥

kernel file: ./tools/sched_ext/include/scx/common.bpf.h — go read her, iykyk ⭐

and the whole friend group:

• RESIZABLE_ARRAY(9)
• MEMBER_VPTR(9)
• ARRAY_ELEM_PTR(9)
• __sink(9)
• time_delta(9)
• time_before(9)
• time_after_eq(9)
• time_before_eq(9)
• time_in_range(9)
• time_in_range_open(9)

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ngl these are all gonna be on the exam and they're all just little time-comparison besties living their best lives 🌸

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okay that's the page, mwah 💖 she lives in ./tools/sched_ext/include/scx and she's stamped October 2026 — go forth and compare your u64s responsibly, main character 🧚‍♀️