Pozsar Balazs <[email protected]> wrote:
>
> I've noticed that the local_irq_enable() call in
> init/main.c::start_kernel() takes 0.3 .. 3.0 seconds on every boot.
> (Measured using printk's around it.)
>
> I am wondering what happens during this call (which is effectively one
> "sti"), why does it take so much time sometimes, and why does it vary so
> much, why isn't it (more) deterministic.
Presumably as soon as it does the sti, the CPU takes one or more interrupts
and runs off and does something.
I wonder what?
You could do something like:
int trace_irqs;
trace_irqs = 1;
local_irq_enble();
trace_irqs = 0;
then, over in handle_IRQ_event():
if (trace_irqs)
print_symbol("calling %s\n", (unsigned long)action->handler);
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