diff options
Diffstat (limited to 'arch/arm64/kernel/time.c')
| -rw-r--r-- | arch/arm64/kernel/time.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c index 29c39d5..03dc371 100644 --- a/arch/arm64/kernel/time.c +++ b/arch/arm64/kernel/time.c @@ -61,6 +61,13 @@ unsigned long profile_pc(struct pt_regs *regs) EXPORT_SYMBOL(profile_pc); #endif +static u64 sched_clock_mult __read_mostly; + +unsigned long long notrace sched_clock(void) +{ + return arch_timer_read_counter() * sched_clock_mult; +} + void __init time_init(void) { u32 arch_timer_rate; @@ -71,6 +78,9 @@ void __init time_init(void) if (!arch_timer_rate) panic("Unable to initialise architected timer.\n"); + /* Cache the sched_clock multiplier to save a divide in the hot path. */ + sched_clock_mult = NSEC_PER_SEC / arch_timer_rate; + /* Calibrate the delay loop directly */ lpj_fine = arch_timer_rate / HZ; } |