tmigr_cpu_new_timer(9)

🎀 NAME 🎀

okay so bestie, this is tmigr_cpu_new_timer(9) from the Kernel API Manual, and its whole thing is enqueue next global timer into hierarchy (idle tmc) — yes, that’s the main character energy 💅✨

🦋 SYNOPSIS 🦋

u64 tmigr_cpu_new_timer (u64 nextexp );

🍓 ARGUMENTS 🍓

• nextexp — Next expiry of global timer (or KTIME_MAX if not) ⏰

🌸 DESCRIPTION 🌸

So the CPU is already deactivated in the timer migration hierarchy here — that’s the setup, no cap 😌

tick_nohz_get_sleep_length calls tick_nohz_next_event and thereby the timer idle path is executed once more 🔁

tmc->wakeup holds the first timer, when the timer migration hierarchy is completely idle 👑

Returns the first timer that needs to be handled by this CPU or KTIME_MAX if nothing needs to be done 🫶

🌈 SEE ALSO 🌈

• Kernel file ./kernel/time/timer_migration.c
• struct tmigr_walk(9)
• tmigr_cpu_activate(9)
• tmigr_handle_remote(9)
• tmigr_requires_handle_remote(9)
• tmigr_cpu_deactivate(9)
• tmigr_quick_check(9)
• tmigr_isolated_exclude_cpumask(9)

Signed off from ./kernel/time, October 2026, as tmigr_cpu_new_timer(9) — mwah 💋✨