STRUCT VDSO_TIME_DATA(9)

🦋 struct vdso_time_data(9) 🦋

okay bestie, welcome to the Kernel API Manual ✨ this one's straight out of ./include/vdso and it's lowkey iconic — it's the vdso datapage representation, and yes, you're gonna want to take notes 💅

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🌸 NAME 🌸

struct vdso_time_data — the vdso datapage representation, fr fr 🫶

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✨ SYNOPSIS ✨

struct vdso_time_data {
    struct arch_vdso_time_data      arch_data;
    struct vdso_clock               clock_data[CS_BASES];
    struct vdso_clock               aux_clock_data[MAX_AUX_CLOCKS];
    s32 tz_minuteswest;
    s32 tz_dsttime;
    u32 hrtimer_res;
    u32 __unused;
 };

like, that's the whole vibe. screenshot it, memorize it, whatever 💖

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🎀 Members 🎀

• arch_data — architecture specific data (it's optional, and it defaults to an empty struct — no cap, it just chills there empty if your arch doesn't need it) 🧚
• clock_data — clocksource related data, and it's an array, bestie 🌈
• aux_clock_data — auxiliary clocksource related data, also an array 💫
• tz_minuteswest — minutes west of Greenwich 🕰️
• tz_dsttime — type of DST correction ⏰
• hrtimer_res — hrtimer resolution 🔥
• __unused — unused. that's it. that's the whole description. it's giving reserve-a-seat energy 💀

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👑 Description 👑

okay so the big thing, the main character note: vdso_time_data will be accessed by 64 bit and compat code at the same time 😭 so please, bestie, be careful before modifying this structure. like actually careful. not "i'll just tweak one field" careful. careful careful. 🫶

and the ordering of the struct members? highkey genius of whoever did it — it's optimized so you get fast access to the often required struct members that are related to CLOCK_REALTIME and CLOCK_MONOTONIC ⭐ that info is stored in the first cache lines, so the hot stuff hits first and the vibe check passes immediately 💅✨

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💜 SEE ALSO 💜

• Kernel file ./include/vdso/datapage.h 📁
• struct vdso_timestamp(9) 🕰️
• struct vdso_clock(9) ⏱️
• struct vdso_rng_data(9) 🎲

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and that's the page!! sourced from ./include/vdso, dated October 2026, and it's literally struct vdso_time_data(9) — slay, go forth and don't break compat code, i'm obsessed with u 🍓💖🦋