[ltt-dev] Problems with LTTV GUI

[Mathieu Desnoyers]

* 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