[ltt-dev] Problems with LTTV GUI (Solved)

Tue May 18 12:20:05 EDT 2010

Thank you Jerome and Mathieu,

Although I patched the kernel correctly my ltt-control and lttv packages were incompatible with the 2.6.31.5 tree. Installing compatible versions did the trick.

Regards,

Gianluca

> Date: Tue, 18 May 2010 11:02:04 -0400
> From: compudj at krystal.dyndns.org
> To: g_v_valentino at hotmail.com
> CC: jeromezhr at gmail.com; ltt-dev at lists.casi.polymtl.ca
> Subject: Re: [ltt-dev] Problems with LTTV GUI
> 
> * Gianluca Valentino (g_v_valentino at hotmail.com) wrote:
> > 
> > Dear Jerome,
> > 
> > I think I have destroyed it correctly, at least that's what it says when I run it in text-mode (see no. 8 below).. I will explain each step that I have done after booting with the LTTng patched kernel below:
> > 
> > 1. Edit system-wide configuration (as explained in the guide: http://lttng.org/cgi-bin/gitweb.cgi?p=lttv.git;a=blob_plain;f=LTTngManual.html#section2)
> > mkdir /mnt/debugfs
> > cp /etc/fstab /etc/fstab.lttng.bkp
> > echo "debugfs         /mnt/debugfs    debugfs rw              0       0"  >> /etc/fstab
> > 2. Insert the specific modules (every time I boot)
> > modprobe kernel-trace
> > modprobe mm-trace
> > modprobe net-trace
> > modprobe fs-trace
> > modprobe jbd2-trace
> > modprobe ext4-trace
> > modprobe syscall-trace
> > modprobe trap-trace
> > modprobe ltt-statedump
> > 
> > I couldn't do
> > 
> > modprobe ltt-trace-control
> > modprobe ltt-marker-control
> > modprobe ltt-tracer
> > modprobe ltt-serialize
> > modprobe ltt-relay
> > 
> > However these should be in-built as they appear as .o and .c files in /lib/modules/2.6.31.5-custom/build/ltt
> 
> Please see the Compatibility list, available from the download section
> of the lttng.org website:
> 
> ltt-control 0.84 is compatible with LTTng 0.191 to 0.214, which means
> kernels 2.6.32.4 to 2.6.33.4. You are using a 2.6.31.5 tree, so I wonder
> which LTTng version you use.
> 
> Thanks,
> 
> Mathieu
> 
> > 
> > 3. I installed the ltt-control and lttv packages as explained in the guide above
> > 
> > 4. echo text > sudo tee -a /mnt/debugfs/ltt/write_event does not give me any error
> > 
> > 5. I execute sudo ltt-armall, and sudo lttv-gui
> > 
> > 6. I click on the 'traffic light' icon and I enter the root password. I click on start and then stop. LTTng Trace Control asks me if I want to open the trace in LTTV. I click yes, and it tells me "Cannot open trace: maybe you should enter in the directory to select it". Checking the sizes of the files in /tmp/trace1 (as you asked me) are all zero-sized.
> > 
> > 7. With the CLI version of lttv: I execute sudo lttctl -C -w /tmp/trace1 trace1. It gives me:
> > 
> > Linux Trace Toolkit Trace Control 0.84-07042010
> > 
> > Controlling trace : trace1
> > 
> > lttctl: Creating trace
> > lttctl: Forking lttd
> > Linux Trace Toolkit Trace Daemon 0.84-07042010
> > 
> > Reading from debugfs directory : /sys/kernel/debug/ltt/trace1
> > Writing to trace directory : /tmp/trace1
> > 
> > lttctl: Starting trace
> > ubuntu at beagleboard:~$
> > 
> > 8. Then I execute sudo lttctl -D trace1 to destroy trace. It gives me:
> > 
> > 
> > 
> > Linux Trace Toolkit Trace Control 0.84-07042010
> > 
> > Controlling trace : trace1
> > 
> > lttctl: Pausing trace
> > lttctl: Destroying trace
> > ubuntu at beagleboard:~$
> > 
> > 9. The only error I encountered was when I tried lttv -m textDump -t /tmp/trace1 for a simple trace dump in text format.
> > 
> > After a series of long lines like:
> > 
> > The input data file /tmp/trace1/net_0 does not contain a trace
> > 
> > it told me WARNING **: Trace /tmp/trace1 has no metadata tracefile
> > 
> > and CRITICAL **: cannot open trace /tmp/trace1
> > 
> > and finally: /usr/local/bin/lttv: line 15: 2152 Segmentation fault $0.real $*
> > 
> > 
> > 
> > Date: Tue, 18 May 2010 21:27:20 +0800
> > Subject: Re: [ltt-dev] Problems with LTTV GUI
> > From: jeromezhr at gmail.com
> > To: g_v_valentino at hotmail.com
> > CC: ltt-dev at lists.casi.polymtl.ca
> > 
> > 2010/5/18 Gianluca Valentino <g_v_valentino at hotmail.com>
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >  
> > 
> > 
> > From: g_v_valentino at hotmail.com
> > To: jeromezhr at gmail.com
> > Subject: RE: [ltt-dev] Problems with LTTV GUI
> > 
> > Date: Tue, 18 May 2010 15:18:16 +0200
> > 
> > 
> > 
> > Dear Jerome,
> >  
> > Thanks for your reply. Yes they are all zero-sized..
> >  
> > Regards,
> >  
> > Gianluca
> >  
> > 
> > 
> > So I think there must be some problems in traceing.
> > Have you destroyed your trace correctly?
> > -- 
> > Regards,
> > 
> > Jerome
> >  		 	   		  
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> 
> -- 
> Mathieu Desnoyers
> Operating System Efficiency R&D Consultant
> EfficiOS Inc.
> http://www.efficios.com

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