[RFC PATCH v2 05/18] sched: add task flag for preempt IRQ tracking
jikos at kernel.org
Sat Apr 30 08:11:45 AEST 2016
On Fri, 29 Apr 2016, Andy Lutomirski wrote:
> > NMI, MCE and interrupts aren't a problem because they have dedicated
> > stacks, which are easy to detect. If the tasks' stack is on an
> > exception stack or an irq stack, we consider it unreliable.
> Only on x86_64.
Well, MCEs are more or less x86-specific as well. But otherwise good
point, thanks Andy.
So, how does stack layout generally look like in case when NMI is actually
running on proper kernel stack? I thought it's guaranteed to contain
pt_regs anyway in all cases. Is that not guaranteed to be the case?
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