exercising current aarch64 kprobe support with systemtap

[David Smith]

On 06/23/2016 08:42 AM, William Cohen wrote:

... stuff deleted ...

> When running the tests on various kernels I typically see message about the hrtimer
> interrupt like the following during the run:
> 
> ...
> Running /root/systemtap_write/systemtap/testsuite/systemtap.onthefly/kprobes_onthefly.exp ...
> [  197.217699] stap_ab30d3b6ca1d8e512f40980479fd57e_18018: module verification failed: signature and/or required key missing - tainting kernel
> [  534.166223] Scheduler tracepoints stat_sleep, stat_iowait, stat_blocked and stat_runtime require the kernel parameter schedstats=enabled or kernel.sched_schedstats=1
> [  534.205668] hrtimer: interrupt took 241848 ns
> ...

The hrtimer interrupt message is PR20286. This appears on more than just
aarch64. Basically the hrtimer probe handler took too long and the next
one has been skipped. We decided there wasn't really anything we could do.

<https://sourceware.org/bugzilla/show_bug.cgi?id=20286>

-- 
David Smith
dsmith@redhat.com
Red Hat
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