timecounter_read_delta(9)

🌸 timecounter_read_delta(9) 🌸

okay so welcome to the Kernel API Manual, bestie — this is the entry for timecounter_read_delta(9) and it's lowkey all about grabbing a time delta. 💅

✨ NAME ✨

timecounter_read_delta — get nanoseconds since last call of this function. no cap, that's the whole name vibe ✨

💻 SYNOPSIS 💻

u64 timecounter_read_delta (struct timecounter *tc );

🎀 ARGUMENTS 🎀

• tc — pointer to time counter. that's it, that's the argument 🎀

🔥 DESCRIPTION 🔥

okay so here's the tea: when the underlying cycle counter runs over, this will be handled correctly — as long as it does not run over more than once between calls. fr fr, that's the condition. 🔥

the first call to this function for a new time counter initializes the time tracking and returns an undefined result. so like, yes, it gives you a u64, but on that first call the result is literally undefined — don't rely on it, bestie. 😭

⚠️ undefined result alert: first call for a new time counter = initializes the time tracking and returns an undefined result. that value is not giving trustworthy, mmkay? 💀

👀 SEE ALSO 👀

• Kernel file ./kernel/time/timecounter.c — go peek at the source if you want the full lore 👀

source/version vibes: ./kernel/time · October 2026 · timecounter_read_delta(9) — byeee bestie 🫶