diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/process_32.c | 15 | ||||
| -rw-r--r-- | arch/x86/kernel/process_64.c | 13 |
2 files changed, 22 insertions, 6 deletions
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 46d391d49de..a63d2d2556e 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_32.c @@ -113,10 +113,19 @@ void default_idle(void) smp_mb(); local_irq_disable(); - if (!need_resched()) + if (!need_resched()) { + ktime_t t0, t1; + u64 t0n, t1n; + + t0 = ktime_get(); + t0n = ktime_to_ns(t0); safe_halt(); /* enables interrupts racelessly */ - else - local_irq_enable(); + local_irq_disable(); + t1 = ktime_get(); + t1n = ktime_to_ns(t1); + sched_clock_idle_wakeup_event(t1n - t0n); + } + local_irq_enable(); current_thread_info()->status |= TS_POLLING; } else { /* loop is done by the caller */ diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index c2db7ef9356..40fed477f3e 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -116,9 +116,16 @@ static void default_idle(void) smp_mb(); local_irq_disable(); if (!need_resched()) { - /* Enables interrupts one instruction before HLT. - x86 special cases this so there is no race. */ - safe_halt(); + ktime_t t0, t1; + u64 t0n, t1n; + + t0 = ktime_get(); + t0n = ktime_to_ns(t0); + safe_halt(); /* enables interrupts racelessly */ + local_irq_disable(); + t1 = ktime_get(); + t1n = ktime_to_ns(t1); + sched_clock_idle_wakeup_event(t1n - t0n); } else local_irq_enable(); current_thread_info()->status |= TS_POLLING; |