* Steven Rostedt <[email protected]> wrote:
> Hi Ingo and Thomas,
>
> On some of my machines, I've been experiencing false NMI lockups.
> This usually happens on slower machines, and taking a look into this,
> it seems to be due to a short time where no processes are using
> timers, and the ktimer interrupts aren't needed. So the APIC timer,
> which now is used only for the ktimers, has a five second pause, and
> causes the NMI to go off. The NMI uses the apic timer to determine
> lockups.
>
> So, I added a more generic method. This only works for x86 for now,
> but it has a #ifdef to keep other archs working until it implements
> this as well. I added a nmi_irq_incr which is called by __do_IRQ in
> the generic code. This is what is used in the NMI code to determine
> if the CPU has locked up. This way we don't have to worry about what
> resource we are using for timers.
but e.g. the APIC timer doesnt go through do_IRQ(), it has its own
special IRQ entry code. The simple solution would be to also include the
IRQ#0 count in the NMI watchdog detection condition - i.e. something
like the patch below. Hm?
Ingo
Index: linux/arch/i386/kernel/nmi.c
===================================================================
--- linux.orig/arch/i386/kernel/nmi.c
+++ linux/arch/i386/kernel/nmi.c
@@ -521,7 +521,7 @@ void notrace nmi_watchdog_tick (struct p
*/
int sum, cpu = smp_processor_id();
- sum = per_cpu(irq_stat, cpu).apic_timer_irqs;
+ sum = per_cpu(irq_stat, cpu).apic_timer_irqs + kstat_irqs(0);
profile_tick(CPU_PROFILING, regs);
if (nmi_show_regs[cpu]) {
-
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