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
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
ubu...@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
ubu...@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: [email protected]
To: [email protected]
CC: [email protected]
2010/5/18 Gianluca Valentino <[email protected]>
From: [email protected]
To: [email protected]
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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