update_wall_time(9)

💫 update_wall_time(9) 💫

ok so first things first, bestie: this is a page from the Kernel API Manual, section 9 — yes, the big-kid kernel developer section, we're in the source-adjacent part of the docs now, no cap 🫶

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✨ NAME ✨

update_wall_time — uses the current clocksource to increment the wall time 💅

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🎀 SYNOPSIS 🎀

void update_wall_time (void );

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🌸 ARGUMENTS 🌸

• void — no arguments. that's it. nothing to pass, nothing to worry about, she takes zero parameters and she serves zero parameters 💀✨

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🦋 DESCRIPTION 🦋

so what does she actually do? she uses the current clocksource to bump the wall time forward — that's the whole main-character job 🔥

and then, like, as if that wasn't already enough: it also updates the enabled auxiliary clock timekeepers 👑 lowkey doing overtime, fr fr.

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⭐ SEE ALSO ⭐

the whole extended friend group 🫶 and also the kernel file she lives in: ./kernel/time/timekeeping.c 😭 iconic address honestly.

• struct tk_fast(9)
• tk_setup_internals(9)
• update_fast_timekeeper(9)
• ktime_get_mono_fast_ns(9)
• ktime_get_raw_fast_ns(9)
• ktime_get_boot_fast_ns(9)
• ktime_get_tai_fast_ns(9)
• ktime_get_real_fast_ns(9)
• halt_fast_timekeeper(9)
• pvclock_gtod_register_notifier(9)
• pvclock_gtod_unregister_notifier(9)
• timekeeping_forward_now(9)
• ktime_get_real_ts64(9)
• ktime_mono_to_any(9)
• ktime_get_raw(9)
• ktime_get_ts64(9)
• ktime_get_seconds(9)
• ktime_get_real_seconds(9)
• __ktime_get_real_seconds(9)
• ktime_get_snapshot_id(9)
• adjust_historical_crosststamp(9)
• ktime_real_to_base_clock(9)
• get_device_system_crosststamp(9)
• timekeeping_clocksource_has_base(9)
• do_settimeofday64(9)
• __timekeeping_inject_offset(9)
• timekeeping_notify(9)
• ktime_get_raw_ts64(9)
• timekeeping_valid_for_hres(9)
• timekeeping_max_deferment(9)
• read_persistent_clock64(9)
• read_persistent_wall_and_boot_offset(9)
• __timekeeping_inject_sleeptime(9)
• timekeeping_inject_sleeptime64(9)
• timekeeping_resume(9)
• getboottime64(9)
• ktime_get_coarse_real_ts64_mg(9)
• ktime_get_real_ts64_mg(9)
• ktime_get_update_offsets_now(9)
• random_get_entropy_fallback(9)
• do_adjtimex(9)
• hardpps(9)
• ktime_get_aux(9)
• ktime_get_aux_ts64(9)

bestie there are 44 of these and i listed every single one because we don't do half-effort in this group chat 💖

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okay that's the page!! and for the little sign-off moment you always do at the end: this one came from the source spot ./kernel/time, dated October 2026, and it's filed under update_wall_time(9) — screenshot it, cite it, live ur truth 🌈💜