ktime_get_real_fast_ns(9)

💫 ktime_get_real_fast_ns(9) — like, the fast one 💫

okay so bestie, welcome to the Kernel API Manual 🌸 — this is the page for ktime_get_real_fast_ns, and honestly? she's iconic. let's get into it 🫶

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✨ NAME ✨

ktime_get_real_fast_ns — NMI safe and fast access to clock realtime. that's it, that's the whole vibe 💅

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🦋 SYNOPSIS 🦋

u64 ktime_get_real_fast_ns (void );

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🎀 ARGUMENTS 🎀

• void — no arguments, bestie. nothing. zero. she takes nothing and gives you a u64. main character energy fr fr 👑

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💖 DESCRIPTION 💖

okay so here's the tea ☕ — for the whole rundown on how the timestamps are ordered, you gotta go see ktime_get_mono_fast_ns. that's where the documentation lives, no cap. this one's the realtime-flavoured sibling and she is NMI safe and fast 😭🔥

ngl, do not skip the ktime_get_mono_fast_ns reading. it's giving required prerequisite, iykyk 🙈

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🌈 SEE ALSO 🌈

the whole friendship group 🫶 — Kernel file ./kernel/time/timekeeping.c plus literally everyone:

• 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)
• 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)
• update_wall_time(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)

like, that's the entire group chat and every single one of them ate 💀🍓

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okay that's the page!! mwah 💋 this lil slice of the kernel lives over in ./kernel/time, and this edition is the October 2026 drop ✨ go be NMI safe and fast out there bestie, stan 🧚💜