Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
timekeeping: Add AUX offset to struct timekeeper
This offset will be used in the time getters of auxiliary clocks. It is
added to the "monotonic" clock readout.
As auxiliary clocks do not utilize the offset fields of the core time
keeper, this is just an alias for offs_tai, so that the cache line layout
stays the same.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20250519083026.533486349@linutronix.de
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include/linux/timekeeper_internal.h
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include/linux/timekeeper_internal.h
···
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* @offs_real: Offset clock monotonic -> clock realtime
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* @offs_boot: Offset clock monotonic -> clock boottime
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* @offs_tai: Offset clock monotonic -> clock tai
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* @offs_aux: Offset clock monotonic -> clock AUX
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* @coarse_nsec: The nanoseconds part for coarse time getters
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* @id: The timekeeper ID
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* @tkr_raw: The readout base structure for CLOCK_MONOTONIC_RAW
···
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* @monotonic_to_boottime is a timespec64 representation of @offs_boot to
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* accelerate the VDSO update for CLOCK_BOOTTIME.
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*
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* @offs_aux is used by the auxiliary timekeepers which do not utilize any
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* of the regular timekeeper offset fields.
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*
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* The cacheline ordering of the structure is optimized for in kernel usage of
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* the ktime_get() and ktime_get_ts64() family of time accessors. Struct
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* timekeeper is prepended in the core timekeeping code with a sequence count,
···
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struct timespec64 wall_to_monotonic;
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ktime_t offs_real;
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ktime_t offs_boot;
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-
ktime_t offs_tai;
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union {
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ktime_t offs_tai;
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ktime_t offs_aux;
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};
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u32 coarse_nsec;
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enum timekeeper_ids id;
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