rtems-record-lttng: Corrupted timestamps after translating to CTF
joel at rtems.org
Thu Mar 18 22:11:48 UTC 2021
On Fri, Mar 5, 2021 at 12:00 PM Gedare Bloom <gedare at rtems.org> wrote:
> On Fri, Mar 5, 2021 at 10:27 AM Joel Sherrill <joel at rtems.org> wrote:
> > On Fri, Mar 5, 2021 at 10:45 AM Sebastian Huber <
> sebastian.huber at embedded-brains.de> wrote:
> >> On 05/03/2021 16:11, Jan.Sommer at dlr.de wrote:
> >> > Some of the resulting CTF events have a very large timestamp. This
> only occurs for events of which are created by CPUs other than CPU0, but
> not all of them.
> >> > I ran rtems-record-lttng in gdb and could track it to
> record-client.c:176 (
> >> > There the (delta * ctx->to_bt_scaler ) causes an overflow and sets
> per_cpu->uptime.bt to a very large negative number which then later
> becomes a very large (positive) timestamp.
> >> >
> >> > I have some trouble figuring out what is going wrong here. The
> timestamps which are read from the rtems record events looks quite
> reasonable to me.
> >> > The to_bt_scaler is quite a large value and I don't fully get what it
> scales. Does someone have some hints?
> >> It could be related to ring buffer overflows. Do you get
> >> RTEMS_RECORD_PER_CPU_OVERFLOW items? There could be also some bugs in
> >> record-client.c. More unit tests for it would be helpful.
> > Asking stupidly, are there tests now? We didn't catch that libtrace was
> missing in the new coverage reports:
> > I can add it to the queue that libtrace is added. If more subsystems
> > are missing that we want to track coverage on, please point them out.
> In cpukit the following are not covered. I have no strong opinion, but
> unless there is justification NOT to report on it, we should? Several
> of these don't have any tests, so then the question is whether they
> should have tests/examples written that use them.
> It may be good just to know that our testsuite covers 0% of some of
> these directories, so that users can know... use at your own peril :o
I'm moving this part over to devel@ and a new thread.
> > --joel
> >> --
> >> embedded brains GmbH
> >> Herr Sebastian HUBER
> >> Dornierstr. 4
> >> 82178 Puchheim
> >> Germany
> >> email: sebastian.huber at embedded-brains.de
> >> phone: +49-89-18 94 741 - 16
> >> fax: +49-89-18 94 741 - 08
> >> Registergericht: Amtsgericht München
> >> Registernummer: HRB 157899
> >> Vertretungsberechtigte Geschäftsführer: Peter Rasmussen, Thomas Dörfler
> >> Unsere Datenschutzerklärung finden Sie hier:
> >> https://embedded-brains.de/datenschutzerklaerung/
> >> _______________________________________________
> >> users mailing list
> >> users at rtems.org
> >> http://lists.rtems.org/mailman/listinfo/users
> > _______________________________________________
> > users mailing list
> > users at rtems.org
> > http://lists.rtems.org/mailman/listinfo/users
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the users