From 5ee613b6751cd91db4b6bd7c1dc9d2f9cf65cde2 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Wed, 30 Jan 2008 13:30:06 +0100 Subject: x86: idle wakeup event in the HLT loop do a proper idle-wakeup event on HLT as well - some CPUs stop the TSC in HLT too, not just when going through the ACPI methods. (the ACPI idle code already does this.) [ update the 64-bit side too, as noticed by Jiri Slaby. ] Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/process_32.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) (limited to 'arch/x86/kernel/process_32.c') diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 46d391d49de8..a63d2d2556ee 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 */ -- cgit v1.2.3