round_jiffies(9)

💖 NAME 💖

okay so bestie, this is the round_jiffies(9) page from the Kernel API Manual — and it's literally the function to round jiffies to a full second. iconic behavior, no cap ✨

✨ SYNOPSIS ✨

unsigned long round_jiffies (unsigned long j );

🎀 ARGUMENTS 🎀

• j — the time in (absolute) jiffies that should be rounded. that's the whole vibe 🫶

🦋 DESCRIPTION 🦋

round_jiffies rounds an absolute time in the future (in jiffies) up or down to (approximately) full seconds. highkey useful for timers where the exact time they fire does not matter too much, as long as they fire approximately every X seconds. periodt 💅

by rounding these timers to whole seconds, all such timers will fire at the same time, rather than at various times spread out. the goal of this is to have the CPU wake up less, which saves power. slay for the planet 🌈🔋

the return value is the rounded version of the j parameter. that's it, that's the tea 🍓

🌸 SEE ALSO 🌸

go bother these besties next, iykyk 👑

• Kernel file ./kernel/time/timer.c struct timer_base(9)
• __round_jiffies_relative(9)
• round_jiffies_relative(9)
• __round_jiffies_up_relative(9)
• round_jiffies_up(9)
• round_jiffies_up_relative(9)
• timer_init_key(9)
• mod_timer_pending(9)
• mod_timer(9)
• timer_reduce(9)
• add_timer(9)
• add_timer_local(9)
• add_timer_global(9)
• add_timer_on(9)
• __timer_delete(9)
• timer_delete(9)
• timer_shutdown(9)
• __try_to_del_timer_sync(9)
• timer_delete_sync_try(9)
• __timer_delete_sync(9)
• timer_delete_sync(9)
• timer_shutdown_sync(9)
• fetch_next_timer_interrupt_remote(9)
• timer_unlock_remote_bases(9)
• timer_lock_remote_bases(9)
• timer_base_is_idle(9)
• timer_expire_remote(9)
• get_next_timer_interrupt(9)
• timer_base_try_to_set_idle(9)
• timer_clear_idle(9)
• __run_timers(9)

mwah 💖 this lil page lives under source ./kernel/time, dated October 2026, and it's the round_jiffies(9) manual page. byeee bestie 🫶🎀