tick_nohz_idle_exit(9)

💅 tick_nohz_idle_exit

okay so bestie, welcome to the Kernel API Manual — this is tick_nohz_idle_exit(9) and honestly she's that girl who shows up right when the idle task dips out and gets the tick situation sorted. 🎀 Let's get into it.

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✨ NAME ✨

tick_nohz_idle_exit — update the tick upon idle task exit 🦋

✨ SYNOPSIS ✨

void tick_nohz_idle_exit (void );

✨ ARGUMENTS ✨

• void — no arguments, bestie. none. zero. she takes nothing and gives everything 💅

✨ DESCRIPTION ✨

so when the idle task exits, the tick gets updated depending on which of these situations we're in 👑 like it's genuinely a vibe check for the tick:

1. If the CPU is not in nohz_full mode (aka the most cases, the normie path), then restart the tick. periodt. 🔥
2. If the CPU is in nohz_full mode (the corner case, the main character scenario 🙈):

2.1) If the tick can be kept stopped (no tick dependencies at all, like none), then re-evaluate the next tick and try to keep it stopped as long as possible. lowkey iconic — keep that tick asleep 😴✨

2.2) If the tick has dependencies though, restart the tick. no cap, it's gotta come back. 💀

ngl, the whole point here is: figure out the tick's situation, then either restart it or keep it stopped as long as you possibly can. slay. 🌸

✨ SEE ALSO ✨

• Kernel file ./kernel/time/tick-sched.c 🫶
• tick_nohz_update_jiffies(9)
• tick_nohz_next_event(9)
• tick_nohz_idle_stop_tick(9)
• tick_nohz_idle_enter(9)
• tick_nohz_irq_exit(9)
• tick_nohz_idle_got_tick(9)
• tick_nohz_get_next_hrtimer(9)
• tick_nohz_get_sleep_length(9)
• tick_nohz_get_idle_calls_cpu(9)
• tick_nohz_switch_to_nohz(9)
• tick_setup_sched_timer(9)

these are literally the whole friend group, go read them too 🧚💜

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so yeah, that's the page!! it lives in ./kernel/time and this version is dated October 2026 — mwah, love that for us 💖⭐ go forth and let your ticks be unbothered 🦋🌈