Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
timekeeping: Provide update for auxiliary timekeepers
Update the auxiliary timekeepers periodically. For now this is tied to the system
timekeeper update from the tick. This might be revisited and moved out of the tick.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20250625183758.382451331@linutronix.de
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kernel/time/timekeeping.c
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kernel/time/timekeeping.c
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#ifdef CONFIG_POSIX_AUX_CLOCKS
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static __init void tk_aux_setup(void);
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static void tk_aux_update_clocksource(void);
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static void tk_aux_advance(void);
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#else
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static inline void tk_aux_setup(void) { }
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static inline void tk_aux_update_clocksource(void) { }
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static inline void tk_aux_advance(void) { }
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#endif
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unsigned long timekeeper_lock_irqsave(void)
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/**
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* update_wall_time - Uses the current clocksource to increment the wall time
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*
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* It also updates the enabled auxiliary clock timekeepers
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*/
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void update_wall_time(void)
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{
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if (timekeeping_advance(TK_ADV_TICK))
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clock_was_set_delayed();
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tk_aux_advance();
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}
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/**
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timekeeping_forward_now(tks);
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tk_setup_internals(tks, tk_core.timekeeper.tkr_mono.clock);
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timekeeping_update_from_shadow(tkd, TK_UPDATE_ALL);
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}
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}
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static void tk_aux_advance(void)
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{
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unsigned long active = READ_ONCE(aux_timekeepers);
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unsigned int id;
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/* Lockless quick check to avoid extra cache lines */
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for_each_set_bit(id, &active, BITS_PER_LONG) {
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struct tk_data *aux_tkd = &timekeeper_data[id + TIMEKEEPER_AUX_FIRST];
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guard(raw_spinlock)(&aux_tkd->lock);
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if (aux_tkd->shadow_timekeeper.clock_valid)
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__timekeeping_advance(aux_tkd, TK_ADV_TICK);
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}
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}
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