On Sat, Dec 10, 2011 at 11:52:51AM -0800, Andi Kleen wrote:
> Dave Chinner <david@xxxxxxxxxxxxx> writes:
> >
> > You forgot about interrupt stacking - that trace shows the system
> > took an interrupt at the point of highest stack usage in the
> > writeback call chain.... :/
>
> The interrupts are always running on other stacks these days
> (even 32bit got switched over).
Where does the x86-64 do the interrupt stack switch?
I know the x86 32 bit interrupt handler switches to an irq/softirq
context stack, but the 64 bit one doesn't appear to. Indeed,
arch/x86/kernel/irq_{32,64}.c are very different, and only the 32
bit irq handler switches to another stack to process the
interrupts...
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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