trace_itimer_expire(9)

🌸 NAME 🌸

okay so bestie, welcome to the Kernel API Manual page for trace_itimer_expire(9) 💖. This is literally the function that gets called when an itimer expires — yes, that itimer-expiry moment 👑. The name line is trace_itimer_expire, and the one-line vibe is: called when itimer expires. No cap, that’s the whole NAME tea 🍓.

✨ SYNOPSIS ✨

here’s the signature, bestie — type it exactly, don’t get creative with the commas or the line break 😭:

void trace_itimer_expire (int which , struct pid *pid , unsigned long
long now );

🎀 ARGUMENTS 🎀

okay so there are three args, and they’re all giving important context 🌈:

• which — the type of the interval timer. That’s the whole assignment, bestie: which timer type.
• pid — the pid of the process that owns the timer. It’s literally the owner’s pid, no extra lore 💅.
• now — the current time, and it’s used to calculate the latency of itimer. Time math era ⏰✨.

🦋 SEE ALSO 🦋

the source file mentioned is the kernel file ./include/trace/events/timer.h — and the whole related cast is here, so don’t leave anyone out 😤:

• trace_timer_init(9)
• trace_timer_start(9)
• trace_timer_expire_entry(9)
• trace_timer_expire_exit(9)
• trace_timer_cancel(9)
• trace_hrtimer_setup(9)
• trace_hrtimer_start(9)
• trace_hrtimer_expire_entry(9)
• trace_hrtimer_start_expired(9)
• trace_hrtimer_expire_exit(9)
• trace_hrtimer_cancel(9)
• trace_hrtimer_rearm(9)
• trace_itimer_state(9)

mwah 💋 — this page is brought to you by ./include/trace/events and dated October 2026, signed off with all the sparkle. xoxo, the Kernel API Manual bestie 🫶💖