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Re: exercising current aarch64 kprobe support with systemtap
- From: David Smith <dsmith at redhat dot com>
- To: William Cohen <wcohen at redhat dot com>, David Long <dave dot long at linaro dot org>, systemtap at sourceware dot org, Pratyush Anand <panand at redhat dot com>, Mark Brown <broonie at linaro dot org>
- Cc: Jeremy Linton <jlinton at redhat dot com>
- Date: Thu, 23 Jun 2016 08:47:23 -0500
- Subject: Re: exercising current aarch64 kprobe support with systemtap
- Authentication-results: sourceware.org; auth=none
- References: <befacf57-b8eb-2926-8f4f-742f0f055a4c at redhat dot com> <d03cd7b7-3d6a-4e4d-71b6-a7325ddd76f3 at redhat dot com> <8f40d0b9-5550-92f9-d1c5-8769f52304c0 at redhat dot com> <576B5501 dot 1030106 at linaro dot org> <3adfefee-7f69-5621-301e-25db1bcd67df at redhat dot com>
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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