diff options
Diffstat (limited to 'arch/arm/kernel/sched_clock.c')
| -rw-r--r-- | arch/arm/kernel/sched_clock.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/kernel/sched_clock.c b/arch/arm/kernel/sched_clock.c index f4515393248..e21bac20d90 100644 --- a/arch/arm/kernel/sched_clock.c +++ b/arch/arm/kernel/sched_clock.c @@ -9,6 +9,7 @@ #include <linux/init.h> #include <linux/jiffies.h> #include <linux/kernel.h> +#include <linux/moduleparam.h> #include <linux/sched.h> #include <linux/syscore_ops.h> #include <linux/timer.h> @@ -27,6 +28,9 @@ struct clock_data { static void sched_clock_poll(unsigned long wrap_ticks); static DEFINE_TIMER(sched_clock_timer, sched_clock_poll, 0, 0); +static int irqtime = -1; + +core_param(irqtime, irqtime, int, 0400); static struct clock_data cd = { .mult = NSEC_PER_SEC / HZ, @@ -157,6 +161,10 @@ void __init setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate) */ cd.epoch_ns = 0; + /* Enable IRQ time accounting if we have a fast enough sched_clock */ + if (irqtime > 0 || (irqtime == -1 && rate >= 1000000)) + enable_sched_clock_irqtime(); + pr_debug("Registered %pF as sched_clock source\n", read); } |