[Ptools-perfapi] kernel 3.0, papi_overflow and exec
vweaver1 at eecs.utk.edu
Tue Aug 16 16:27:19 EDT 2011
Thanks for the bug report.
I've noticed that the overflow-related PAPI regression tests fail on 3.0
as well. I was working with the kernel devs pre-3.0 on some overflow
handling stuff, but the changes they made just made things worse. Then
they stopped working on it for a while and I forgot to do more testing
before the release.
> Here's how to reproduce the problem. This is with kernel 3.0.0,
> perf_events and PAPI 4.1.3 on an AMD x86-64. My PAPI overflow tests
> are available via anon svn checkout from:
> svn co http://svn.rice.edu/r/krentel/pub/papi-tests
> The 'exec' test demonstrates the problem. It starts PAPI_overflow()
> and calls exec(). The child should be able to run on its own, but
> instead it dies on "Real-time signal 2".
I'll try this and also see if I can get a small reproducible test to send
the kernel devs. Hopefully this doesn't require a bisect as that takes
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