ktime_get_boottime_ns(9)

💅 ktime_get_boottime_ns(9)

okay so welcome to the Kernel API Manual bestie, today's main character is ktime_get_boottime_ns — the function that tells you how long it's been since boot, in nanoseconds. yes, nanoseconds. she's precise. periodt. ✨

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🌸 NAME 🌸

ktime_get_boottime_ns — get the monotonic time since boot in nanoseconds 🕐

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🎀 SYNOPSIS 🎀

u64 ktime_get_boottime_ns (void );

like, that's the whole vibe. returns a u64, takes nothing. no cap. 💖

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🦋 ARGUMENTS 🦋

• void — no arguments, bestie. it literally needs nothing from you. she's low maintenance like that. 🙈

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✨ RETURN ✨

the current boottime converted to nanoseconds ⭐

that's it, that's the return value. a u64 full of nanoseconds since boot. iconic behavior honestly. 👑

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🌈 SEE ALSO 🌈

• the kernel file is ./include/linux/timekeeping.h — that's where she lives, iykyk 🧚
• ktime_get_real(9)
• ktime_get_boottime(9)
• ktime_get_clocktai(9)
• ktime_mono_to_real(9)
• ktime_get_ns(9)
• ktime_get_real_ns(9)
• ktime_get_clocktai_ns(9)
• ktime_get_raw_ns(9)
• struct system_time_snapshot(9)
• struct system_counterval_t(9)
• struct system_device_crosststamp(9)

like a whole friend group of time functions fr fr 🫶 go say hi to all of them.

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ngl if you're doing timing stuff in the kernel, read the whole timekeeping.h file — she's got lore and it's all documented. 💀

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anyway that's the page!! tysm for reading, mwah 💋

source path: ./include/linux · version date: October 2026 · and yes we're still shipping ktime_get_boottime_ns(9) in this economy 💅✨