STRUCT SYSTEM_COUNTERVAL_T(9)

✨ struct system_counterval_t(9) ✨

okay so bestie, this one is a kernel API manual page — it's giving "struct that holds a system counter value plus the ID of the clocksource it came from" and honestly? iconic. it lives in the Kernel API Manual section (section 9, if you're keeping track 💅). let's get into it 🎀

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💫 NAME 💫

struct system_counterval_t — a system counter value that also carries the ID of the corresponding clocksource. like, the value and its receipts, fr fr 🫶

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🌸 SYNOPSIS 🌸

struct system_counterval_t {
    u64 cycles;
    enum clocksource_ids    cs_id;
    bool use_nsecs;
 };

there she is. three members, no notes. 🦋

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👑 Members 👑

⭐ cycles

the system counter value itself. that's the number, bestie, the whole point of the struct 💖

⭐ cs_id

the clocksource ID corresponding to the system counter value. timekeeping code uses this to verify comparability of two cycle values — like a vibe check, but for numbers 😭. important detail: the default ID, CSID_GENERIC, does not identify a specific clocksource. so it's kind of the "no one in particular" ID, ngl.

⭐ use_nsecs

when this is set, cycles is in nanoseconds. that's it, that's the flag. 🧚

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🌈 SEE ALSO 🌈

• Kernel file ./include/linux/timekeeping.h
• 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_boottime_ns(9)
• ktime_get_clocktai_ns(9)
• ktime_get_raw_ns(9)
• struct system_time_snapshot(9)
• struct system_device_crosststamp(9)

like, the whole friend group honestly 💜

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heads up bestie: anything you read here is only true if it's in the original page — no invented behaviour, no extra tips, periodt. 💅

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and that's the page!! sign-off time 🎀 it ships from ./include/linux, dated October 2026, and the header/footer both say struct system_counterval_t(9) — so you literally can't miss it. go forth and timekeep, queen 👑✨