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SubjectRe: [PATCH] s390/livepatch: Implement reliable stack tracing for the consistency model
On Wed, Jul 17, 2019 at 01:01:27PM +0200, Miroslav Benes wrote:
> > On a related note, do you think it would be feasible to extend (in
> > another patchset) the reliable stack unwinding code a bit so that we
> > could feed it pre-baked stacks ... then we could verify that the code
> > was finding interesting scenarios. That was a passing thought I had
> > back when Nicolai and I were debugging the ppc64le exception frame
> > marker bug, but didn't think it worth the time/effort at the time.
>
> That is an interesting thought. It would help the testing a lot. I will
> make a note in my todo list.

Another idea I had for reliable unwinder testing: add a
CONFIG_RELIABLE_STACKTRACE_DEBUG option which does a periodic stack
trace and warns if it doesn't reach the end. It could triggered from a
periodic NMI, or from schedule().

--
Josh

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