diff options
Diffstat (limited to 'arch/i386/kernel/tsc.c')
| -rw-r--r-- | arch/i386/kernel/tsc.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c index ea63a30ca3e..debd7dbb415 100644 --- a/arch/i386/kernel/tsc.c +++ b/arch/i386/kernel/tsc.c @@ -27,6 +27,7 @@ static int tsc_enabled; * an extra value to store the TSC freq */ unsigned int tsc_khz; +EXPORT_SYMBOL_GPL(tsc_khz); int tsc_disable; @@ -58,10 +59,11 @@ __setup("notsc", tsc_setup); */ static int tsc_unstable; -static inline int check_tsc_unstable(void) +int check_tsc_unstable(void) { return tsc_unstable; } +EXPORT_SYMBOL_GPL(check_tsc_unstable); /* Accellerators for sched_clock() * convert from cycles(64bits) => nanoseconds (64bits) @@ -84,7 +86,7 @@ static inline int check_tsc_unstable(void) * * -johnstul@us.ibm.com "math is hard, lets go shopping!" */ -static unsigned long cyc2ns_scale __read_mostly; +unsigned long cyc2ns_scale __read_mostly; #define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */ @@ -93,15 +95,10 @@ static inline void set_cyc2ns_scale(unsigned long cpu_khz) cyc2ns_scale = (1000000 << CYC2NS_SCALE_FACTOR)/cpu_khz; } -static inline unsigned long long cycles_2_ns(unsigned long long cyc) -{ - return (cyc * cyc2ns_scale) >> CYC2NS_SCALE_FACTOR; -} - /* * Scheduler clock - returns current time in nanosec units. */ -unsigned long long sched_clock(void) +unsigned long long native_sched_clock(void) { unsigned long long this_offset; @@ -118,12 +115,24 @@ unsigned long long sched_clock(void) return (jiffies_64 - INITIAL_JIFFIES) * (1000000000 / HZ); /* read the Time Stamp Counter: */ - get_scheduled_cycles(this_offset); + rdtscll(this_offset); /* return the value in ns */ return cycles_2_ns(this_offset); } +/* We need to define a real function for sched_clock, to override the + weak default version */ +#ifdef CONFIG_PARAVIRT +unsigned long long sched_clock(void) +{ + return paravirt_sched_clock(); +} +#else +unsigned long long sched_clock(void) + __attribute__((alias("native_sched_clock"))); +#endif + unsigned long native_calculate_cpu_khz(void) { unsigned long long start, end; |