Home » Eclipse Projects » Linux Tools Project » How to use Callgraph / SystemTap on Debian Squeeze ?
| How to use Callgraph / SystemTap on Debian Squeeze ? [message #644880] |
Tue, 14 December 2010 14:00  |
 Joost Kraaijeveld
Messages: 273
Registered: July 2009 |
Senior Member |
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Hi,
I want to use Callgraph / Systemtap on Debian Squeeze (AMD64). I have
installed System tap, I am member of the appropriate groups etc and the
test described
http://sources.redhat.com/systemtap/SystemTap_Beginners_Guid e/using-systemtap.html#testing
seems to work, be it that my output is much more verbose.
However running my program leads to:
semantic error: process probes not available without kernel
CONFIG_UTRACE while resolving probe point
process("/home/jkr/Programming/C++/Test/Debug/Test").end
Pass 2: analysis failed. Try again with another '--vp 01' option.
Is this a recognisable error and more important, what should I do to
correct this?
I use the lates version of Eclipse with all relevant LinuxTools plugins.
TIA
Joost
Cheers,
Joost
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| Re: How to use Callgraph / SystemTap on Debian Squeeze ? [message #645086 is a reply to message #644991] |
Wed, 15 December 2010 14:50  |
Lukas Berk
Messages: 1
Registered: December 2010 |
Junior Member |
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>I want to use Callgraph / Systemtap on Debian Squeeze (AMD64). I have
>installed System tap, I am member of the appropriate groups etc and the
>test described
> http://sources.redhat.com/systemtap/SystemTap_Beginners_Guid e/using-systemtap.html#testing
>seems to work, be it that my output is much more verbose.
would you be able to post the more verbose output? sometimes clues to what's going wrong can be found there, also running with a -vv flag will produce slightly more output which may help diagnosing what's wrong.
As for checking if your kernel has utrace, the kernel configuration file is located in /usr/src/kernels/`uname -r`/.config with the utrace option labelled CONFIG_UTRACE (at least in fedora, should be similar if not the same in debian).
If you're still having problems please feel free to contact the systemtap mailing list directly "systemtap AT sources DOT redhat DOT com", or hop on our irc channel on freenode ( #systemtap on irc.freenode.net)
EDIT: fixed email
[Updated on: Wed, 15 December 2010 14:55] Report message to a moderator |
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| Re: How to use Callgraph / SystemTap on Debian Squeeze ? [message #645161 is a reply to message #645086] |
Wed, 15 December 2010 18:12 |
Joost Kraaijeveld
Messages: 273
Registered: July 2009 |
Senior Member |
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This is a multi-part message in MIME format.
--------------010104030607070301060807
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Hi Lukas,
On 15/12/10 15:50, Lukas Berk wrote:
> would you be able to post the more verbose output? sometimes clues to
> what's going wrong can be found there, also running with a -vv flag will
> produce slightly more output which may help diagnosing what's wrong.
Attached the out of "stap -v -e 'probe vfs.read {printf("read
performed\n"); exit()}'"
> As for checking if your kernel has utrace, the kernel configuration file
> is located in /usr/src/kernels/`uname -r`/.config with the utrace
> option labelled CONFIG_UTRACE (at least in fedora, should be similar if
> not the same in debian).
My config has no CONFIG_UTRACE but as per
http://sourceware.org/systemtap/wiki/SystemTapWithSelfBuiltK ernel
CONFIG_DEBUG_INFO,
CONFIG_KPROBES,
CONFIG_RELAY,
CONFIG_DEBUG_FS,
CONFIG_MODULES,
CONFIG_MODULE_UNLOAD
are enabled.
Also the SystemTap wiki suggest that it should work OOTB:
http://sourceware.org/systemtap/wiki/SystemtapOnDebian
> If you're still having problems please feel free to contact the
> systemtap mailing list directly ( mailto:systemtap@sources.redhat.com )
> , or hop on our irc channel on freenode ( #systemtap on irc.freenode.net)
OK
TIA
Joost
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--------------010104030607070301060807--
Cheers,
Joost
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| Re: How to use Callgraph / SystemTap on Debian Squeeze ? [message #645181 is a reply to message #645173] |
Wed, 15 December 2010 19:40 |
Joost Kraaijeveld
Messages: 273
Registered: July 2009 |
Senior Member |
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On 15/12/10 20:08, Severin Gehwolf wrote:
> Joost,
>
> Which approach did you use 1., 2. or 3.?
>
> 1.) http://sources.redhat.com/systemtap/wiki/SystemtapOnDebian
> 2.) http://sources.redhat.com/systemtap/wiki/SystemTapWithSelfBu iltKernel
> 3.)
> http://sources.redhat.com/git/?p=systemtap.git;a=blob_plain;f=README;hb=HEAD
I used approach 1, checked the enabling settings mentioned in 2. As I am
not able to use anything else than stock Debian kernels due to policy
matters I did not do anything with with 3, other than read it (and not
very thorough I must admit now I reread it).
Especially the part that says "Boot into the kernel" makes me wonder.....
> p.s. I also think it would be a good idea trying to get rid of those
> errors you get for the vfs.read probe, first.
If I only knew why they are there....
<Desperate tone>
Sometimes it would be very nice that things just work in Open Source
country, without the need to be a specialist in everything.
</desperate tone>
But thanks for responding, really very much appreciated.
Joost
Cheers,
Joost
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| Re: How to use Callgraph / SystemTap on Debian Squeeze ? [message #645320 is a reply to message #645234] |
Thu, 16 December 2010 16:00 |
Severin Gehwolf
Messages: 40
Registered: June 2010 |
Member |
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| Joost Kraaijeveld wrote on Thu, 16 December 2010 02:39 | Hi Severin,
> p.s. I also think it would be a good idea trying to get rid of those
> errors you get for the vfs.read probe, first.
I have found where the errors came from: they all refer to functions
that are in the Radeon fglrx driver, which is not included in the debug
kernel. Although I could change to the Open Source Radeon driver which
has a debug version available, we have several machines which have the
all closed source NVidia drivers for which no debug is available afaik.
All information that I could find about SystemTap and modules without
debug info is about how to add probing, not how to make any errors
disappear. Is there something like "do not probe this module and do not
report any errors about it"?
TIA,
Joost
|
To be honest I'm not knowledgeable enough to answer that question. My guess is you can't. To confirm, I recommend asking the systemtap mailing list or on their IRC channel. It's good that you know the cause of those errors. A key point may be to confirm that it doesn't affect other systemtap probing.
Anyhow, did you end up patching the Debian kernel to get UTRACE support after all? Did you decide to not use the Callgraph plug-in? Maybe it would be a good idea to file a bug against the Debian kernel, requesting inclusion of the utrace patch.
Let us know what you end up doing.
Thanks!
Severin
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| Re: How to use Callgraph / SystemTap on Debian Squeeze ? [message #645345 is a reply to message #645340] |
Thu, 16 December 2010 17:10 |
Severin Gehwolf
Messages: 40
Registered: June 2010 |
Member |
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| Joost Kraaijeveld wrote on Thu, 16 December 2010 11:43 |
> Anyhow, did you end up patching the Debian kernel to get UTRACE support
> after all?
I did not patch the kernel but SystemTap works: I can run the simple
helloworld script and several other scripts that come with the
documentation. This is all without UTRACE support in my kernels config.
|
Just to clarify: systemtap working is not the same as user
application tracing support. The latter is required for the callgraph
plug-in. Yet, user app tracing powered by systemtap requires utrace
support.
| Joost Kraaijeveld wrote on Thu, 16 December 2010 11:43 |
> Did you decide to not use the Callgraph plug-in?
If I cannot get it to work than I am not able to use is. And that is
against my will, as I am needing both the Callgraph and the Profile plugin.
|
You won't be able to get it working without utrace support in your
Linux kernel.
| Joost Kraaijeveld wrote on Thu, 16 December 2010 11:43 |
> Maybe it would be a good idea to file a bug against the Debian kernel, requesting
> inclusion of the utrace patch.
I am not sure that the problem is in the Debian kernel as SystemTap
itself is working OK (minus the fglrx problem). It is the Eclipse plugin
that complains.
|
That is because you have systemtap without utrace. Debian and Ubuntu
folks don't have UTRACE support in their kernels, yet. So it appears.
See:
https://bugs.launchpad.net/ubuntu/+source/systemtap/+bug/529 313
Cheers,
Severin
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