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time: Introduce tk_fast_raw

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Add the NMI safe CLOCK_MONOTONIC_RAW accessor..

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20150319093400.562746929@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2015-03-19 09:39:08 +01:00 committed by Ingo Molnar
parent 4498e7467e
commit f09cb9a180
2 changed files with 14 additions and 0 deletions
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1
include/linux/timekeeping.h
View file

@ -220,6 +220,7 @@ static inline u64 ktime_get_raw_ns(void)
}
extern u64 ktime_get_mono_fast_ns(void);
extern u64 ktime_get_raw_fast_ns(void);
/*
* Timespec interfaces utilizing the ktime based ones

13
kernel/time/timekeeping.c
View file

@ -59,6 +59,7 @@ struct tk_fast {
};
static struct tk_fast tk_fast_mono ____cacheline_aligned;
static struct tk_fast tk_fast_raw ____cacheline_aligned;
/* flag for if timekeeping is suspended */
int __read_mostly timekeeping_suspended;
@ -434,6 +435,12 @@ u64 ktime_get_mono_fast_ns(void)
}
EXPORT_SYMBOL_GPL(ktime_get_mono_fast_ns);
u64 ktime_get_raw_fast_ns(void)
{
return __ktime_get_fast_ns(&tk_fast_raw);
}
EXPORT_SYMBOL_GPL(ktime_get_raw_fast_ns);
/* Suspend-time cycles value for halted fast timekeeper. */
static cycle_t cycles_at_suspend;
@ -461,6 +468,11 @@ static void halt_fast_timekeeper(struct timekeeper *tk)
cycles_at_suspend = tkr->read(tkr->clock);
tkr_dummy.read = dummy_clock_read;
update_fast_timekeeper(&tkr_dummy, &tk_fast_mono);
tkr = &tk->tkr_raw;
memcpy(&tkr_dummy, tkr, sizeof(tkr_dummy));
tkr_dummy.read = dummy_clock_read;
update_fast_timekeeper(&tkr_dummy, &tk_fast_raw);
}
#ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD
@ -592,6 +604,7 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action)
sizeof(tk_core.timekeeper));
update_fast_timekeeper(&tk->tkr_mono, &tk_fast_mono);
update_fast_timekeeper(&tk->tkr_raw, &tk_fast_raw);
}
/**