time_delta(9)

💅 time_delta(9) — from the Kernel API Manual, bestie

okay so you know how the kernel is literally always comparing timestamps and someone has to do the math? yeah. that someone is time_delta, and she ate. no cap.

✨ NAME ✨

time_delta — calculate the delta between new and old time stamp 🕐💫

🌸 SYNOPSIS 🌸

s64 time_delta (u64 after , u64 before );

🎀 ARGUMENTS 🎀

• after — your first comparable, typed as a u64 (this is the "new" one, main character energy)
• before — your second comparable, also a u64 (the "old" one, respectfully)

fr fr just hand her two u64 values and she'll sort out the rest.

🦋 RETURN 🦋

the time difference, which is >= 0 ⭐ — yes bestie, always zero or up, never ever negative, we don't do negativity here 💅

👑 SEE ALSO 👑

• Kernel file ./tools/sched_ext/include/scx/common.bpf.h — go peek, iykyk 📂
• RESIZABLE_ARRAY(9)
• MEMBER_VPTR(9)
• ARRAY_ELEM_PTR(9)
• __sink(9)
• time_after(9)
• time_before(9)
• time_after_eq(9)
• time_before_eq(9)
• time_in_range(9)
• time_in_range_open(9)

that's the whole time-comparison friend group right there, and time_delta is the one who actually does the subtraction 🫶

and that's the page, bestie 💖 brought to you by ./tools/sched_ext/include/scx, dated October 2026, under the very iconic title time_delta(9) — slay, go compare some timestamps 🌈🧚