Hi François,
On 7/12/24 12:21 PM, François Belias wrote:
Hello Kienan,
Thanks for your reply. I'm working on analyzing a virtual machine by
tracing both the host and the guest. I need these tracepoints to
synchronize the traces and begin my analysis. Could you provide any
steps or recommendations for making these add-ons compatible with the
current version of LTTng so that I don't have the error I
mentioned earlier?
I think you will also have to modify the Kbuild file so that it builds
the new modules that are in the addons folder.
I assume there will be other changes to make but to go over all the
details is beyond the scope of what I think I can effectively help you with.
You may want to consult a resource like
https://sysprog21.github.io/lkmpg/#functions-available-to-modules to see
how it works to configure and write kernel modules.
thanks,
kienan
P.S. Could you please keep lttng-dev in CC? thanks
Thanks,
François
Le ven. 12 juill. 2024, à 10 h 33, Kienan Stewart <kstew...@efficios.com
<mailto:kstew...@efficios.com>> a écrit :
Hi François,
On 7/11/24 6:06 PM, François Belias wrote:
> Hello Kienan, thanks for the reply. For my analysis, I am also
looking
> for these tracepoints:
> - vmsync_gh_guest
> - vmsync_hg_guest
> - vmsync_gh_host
> - vmsync_hg_host
> does the canonical upstream version have them ? thanks.
>
No, it doesn't. Those tracepoints are custom by the looks of it, and
not
tracepoints that exist in the mainline linux kernel.
thanks,
kienan
> François
>
> Le jeu. 11 juill. 2024, à 16 h 55, Kienan Stewart
<kstew...@efficios.com <mailto:kstew...@efficios.com>
> <mailto:kstew...@efficios.com <mailto:kstew...@efficios.com>>> a
écrit :
>
> Hi François,
>
> We don't support the forked version of LTTng modules that you
are using
> (https://github.com/tahini/lttng-modules
<https://github.com/tahini/lttng-modules>
> <https://github.com/tahini/lttng-modules
<https://github.com/tahini/lttng-modules>>)
>
> The canonical upstream version available at
> https://github.com/lttng/lttng-modules
<https://github.com/lttng/lttng-modules>
> <https://github.com/lttng/lttng-modules
<https://github.com/lttng/lttng-modules>> has tracepoints such as
> kvm_entry
> and kvm_exit.
>
> E.g.
>
https://github.com/lttng/lttng-modules/blob/06a1fc639b10b40c0ffc412f3fb663632e42dae6/include/instrumentation/events/arch/x86/kvm/trace.h#L20
<https://github.com/lttng/lttng-modules/blob/06a1fc639b10b40c0ffc412f3fb663632e42dae6/include/instrumentation/events/arch/x86/kvm/trace.h#L20>
<https://github.com/lttng/lttng-modules/blob/06a1fc639b10b40c0ffc412f3fb663632e42dae6/include/instrumentation/events/arch/x86/kvm/trace.h#L20
<https://github.com/lttng/lttng-modules/blob/06a1fc639b10b40c0ffc412f3fb663632e42dae6/include/instrumentation/events/arch/x86/kvm/trace.h#L20>>
>
> thanks,
> kienan
>
> On 7/11/24 4:06 PM, François Belias via lttng-dev wrote:
> > Hello,
> >
> > I am trying to access tracepoints from this website
> >
>
https://archive.eclipse.org/tracecompass.incubator/doc/org.eclipse.tracecompass.incubator.virtual.machine.analysis.doc.user/Virtual-Machine-Analysis-User-Documentation.html
<https://archive.eclipse.org/tracecompass.incubator/doc/org.eclipse.tracecompass.incubator.virtual.machine.analysis.doc.user/Virtual-Machine-Analysis-User-Documentation.html>
<https://archive.eclipse.org/tracecompass.incubator/doc/org.eclipse.tracecompass.incubator.virtual.machine.analysis.doc.user/Virtual-Machine-Analysis-User-Documentation.html
<https://archive.eclipse.org/tracecompass.incubator/doc/org.eclipse.tracecompass.incubator.virtual.machine.analysis.doc.user/Virtual-Machine-Analysis-User-Documentation.html>>
<https://archive.eclipse.org/tracecompass.incubator/doc/org.eclipse.tracecompass.incubator.virtual.machine.analysis.doc.user/Virtual-Machine-Analysis-User-Documentation.html
<https://archive.eclipse.org/tracecompass.incubator/doc/org.eclipse.tracecompass.incubator.virtual.machine.analysis.doc.user/Virtual-Machine-Analysis-User-Documentation.html>
<https://archive.eclipse.org/tracecompass.incubator/doc/org.eclipse.tracecompass.incubator.virtual.machine.analysis.doc.user/Virtual-Machine-Analysis-User-Documentation.html
<https://archive.eclipse.org/tracecompass.incubator/doc/org.eclipse.tracecompass.incubator.virtual.machine.analysis.doc.user/Virtual-Machine-Analysis-User-Documentation.html>>>
(kmv_entry, kmv_exit) for my analysis. I added the "addons" folder from the "addons_vm" branch of this repository: https://github.com/tahini/lttng-modules
<https://github.com/tahini/lttng-modules> <https://github.com/tahini/lttng-modules <https://github.com/tahini/lttng-modules>>
<https://github.com/tahini/lttng-modules <https://github.com/tahini/lttng-modules> <https://github.com/tahini/lttng-modules
<https://github.com/tahini/lttng-modules>>> to the current version of lttng-module github repository. However, I am encountering these errors when compiling
> > ERROR: modpost: "lttng_tracepoint_probe_register"
> > [lttng-modules/src/addons/lttng-vmsync-guest.ko] undefined!
> > ERROR: modpost: "lttng_tracepoint_probe_unregister"
> > [Desktop/lttng-modules/src/addons/lttng-vmsync-guest.ko]
undefined!
> > ERROR: modpost: "lttng_tracepoint_probe_register"
> > [Desktop/lttng-modules/src/addons/lttng-vmsync-host.ko]
undefined!
> > ERROR: modpost: "lttng_tracepoint_probe_unregister"
> > [Desktop/lttng-modules/src/addons/lttng-vmsync-host.ko]
undefined!
> >
> > I am not sure how to resolve this issue. Can someone
please help me?
> >
> > Thanks.
> >
> > _______________________________________________
> > lttng-dev mailing list
> > lttng-dev@lists.lttng.org
<mailto:lttng-dev@lists.lttng.org> <mailto:lttng-dev@lists.lttng.org
<mailto:lttng-dev@lists.lttng.org>>
> > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
<https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev>
> <https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
<https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev>>
>
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